You asked for it ... we delivered. Mark talks with Kevin, the pilot of this incredible K-Max helicopter, used for firefighting and other heavy lift operations.
I had theories on how it yaws and he confirmed it as well as my concern that if you put more torque on one rotor than the other its going to roll as the rotor your putting more torque on moves to the vertical.
What a brilliant interview. The pilot could be a salesman for the unique and mission capable helicopter. Who’d have thought such a marvelous control system would allow this wooden rotor machine to lift twice its weight. Simply amazing!
I was just teaching helicopter rotor systems to my ground class and someone asked how the K-Max worked. I wasn’t really sure until watching this. WONDERFUL explanation. Thanks you guys!
Kevin, the pilot did a sensational job of explaining this aircraft! Every minute was educational and interesting! Thank you so much for the opportunity to learn about the K-MAX helicopter!
Another fantastic video, Mark. I love the simplicity yet wealth of information. Kevin certainly knows his machine inside and out as well as the history of it.
Wow, I enjoyed that. The pilot explained things so clearly and the questions really brought out the fascinating aspects of this aircraft. I came here because I just watched a video of a K-Max lifting a car from a frozen lake. The minders made everyone outside the helicopter practically lie down on the ground as the helicopter took off. Now I know why!
This aircraft provides plenty of opportunity to talk about the differences between such vehicles and more conventional aircraft....and to appreciate the logic behind the variety of approaches.
Just a fantastic video for a "propellor head" fixed wing pilot such as myself. Thanks Mark and Kevin! I thoroughly enjoyed that. The little "tail strike gauge" under the rudder I reckon should be called a "tell-tail"! - As it will soon tell the "tales of woe" that the rear end endured if you were ham-fisted with the cyclic during landing! What an amazing and very clever lifting machine, that can lift more than it own weight, - WOW!
What a fascinating machine! I've only seen these intermeshing types in books or films. It's interesting how they operate compared to a typical single rotor helicopter. I must thank Kevin for giving a most excellent explanation of the K-Max. This man knows his flying machine quite well!
Outstanding video. Believe that ship did some time in Mariposa this fire season. The pilots and mechanic’s on all the K Max’s are an amazingly patient group of professionals. These unique ships just draw people to them and the crews are outstanding at explaining the concept’s that keep the rotors apart and control without a tail rotor.
...how true, Kevin was great in his presentation of this aircraft. Having an owner/pilot that engaging really sets the video apart. And blades @ $1million a set, (!?) and made of wood no less, EEE GADS! Big thumbs up Mark!
Nice - very nice! Kevin is very well versed in this machine judging by his explaining. Thank you again Mark, for a top video. P.S. Neat little cameo of the Skywagon....
Very interesting and informative, I always thought these were Russian helicopters. They do have a similar machine. Many thanks for presenting this unique bird.
Excellent explaining, Kevin. Now I can fly it. Flying is easy, I have an MSFS2020 ... This is what my passengers are telling me. Oh, and of course the allmighty autopilot does the takeoffs & landings. 😉 Fly safely, Kevin. Stay vigilant. Regards from far east. RS Thanks for the video.
Tail rotor only takes about 10 %, NOT 30 %. but even that is a significant improvement of efficiency. The swept area of the blades is a lot more than usual for a helicopter of this power class (1350 HP), so the downdraft is lower intensity spread over a larger area. The characteristic of the Flettner intermeshing rotor system is that it tends to a stable hover, and requires pilot input to move, unlike most other helicopters.
In case anyone is interested on the CH-47 Chinook yaw is by opposing left and right cyclic at the front and back rotor and fore/aft movement is by increasing collective on one rotor and decreasing it on the other. There is also a "longitudinal trim actuator" that applies fore/aft cyclic to both rotors but this is only used to pull the nose up in forward flight and push it down in hover (the CH-47 wants to hover nose high) and it's controlled by the electronics not the pilot.
Great video Mark. I bought a 172E with the O360 from you about a year and a half ago. I'm putting a new interior in it at the moment, and then it's going back on the market. I love flying this plane, but I don't fly it enough to justify the cost.
Had a helicopter doing weed spraying at my place this year. That pilot was spot on, but also knew everything about the chem he was spraying, such as it's toxicity to humans, aquatic life etc, persistence in the environment, and the history of its discovery and development. Those pilots are info junkies!
Excellent 'walkaround' Gents, thank you. Although trying to imagine the actual physics of this machine in flight, does leave me wanting a larger colouring book& more crayons. - eg. Is ground resonance 'a thing' with this rotor system, or at a million bucks per blade, does that kind of madness only affect your bank manager's desk legs? Fabulous machine, a working madness to the benefit of all - in skilled hands, a marvel - but in mine, shameful wreckage : )
Ground resonance is usually a byproduct of lead/lag hinges falling out of sync. So I don't believe this rotor system is susceptible to that, at least in the traditional sense. Though it might still be possible since the wheels have oleo struts, usually not something you see unless impact dampening is required (the source of ground resonance).
Thanks to Mark for the video and thanks to Kevin for explaining the mechanics of the craft. Check out the Flettner 282 'helicopter' which first flew in 1941. The Flettner 282 had intermeshing rotors just like the Kamax.
Can it auto-rotate during engine failure for a safe landing like a traditional helicopter? ( EXCELLENT video. ) To the pilot: thank you for your services.
Question for someone. I gather the blade is solid wood (laminated) aside from an internal channel for the control rod. Where is the centre of gravity chord wise? On a single blade machine operated with a swashplate the CG is about 25% back from the leading edge. Excellent video thank you.
That’s correct. After World War II, the US conducted “operation paper clip” which involved bringing the brightest minds from Europe over to the United States to aid in our lead of the arms race as we moved into the Cold War. One of these minds was Flettner. He was a key person in helping Charlie Kaman build and develop the H-125, H225, The Husky, and finally the Kmax.
Saw one of these machines at a secluded helipad behind tall bushes while I peed into the hedge on a long roadtrip across British Columbia. Was such an alien looking machine, I had no idea what I was looking at. Thought it was some odd kit or prototype, not one of the most respected lift aircraft in the world. Amazing. Also, what car is that in the background at the 17:00 minute mark?? Let's get a break down of that beauty!!
Awesome interview and excellent explanations. This aircraft has always intrigued me. Just one question that was not asked. Given a pair of blades is in the order of $1M, how much is the aircraft worth?
Fascinating video Mark! My Dad worked for Charlie Kaman in the day ...they were friends..he came to to family cookouts I cant corroborate I was 1 or 2 ...My Dad worked on the Husky..Im very curious about what goes into to rotor blades on the K Max that cost 1m a set... What kind of wood what glueing process...
Mark: one question I have that I wish you would ask your guest is, since the aircraft creates yaw by increasing the angle of attack on the rotors on one side, thus creating more lift on that side and the pilot has to use the cyclic to counteract that lift I surmise that the action of the cyclic doesn't create as much yaw as the increased angle of attack. Is this correct? An addendum to this question is: is there a difference between how this helicopter's cyclic acts compared to a normal helicopter? Same for the collective? Please would you have the pilot expand on this topic?
Hello Robert. Good question. In regards to the flight controls, they all work similar to other helicopters. Pedals create a yaw movement , cyclic is directional control, and collective is mainly your up and down. Of the three inputs, pedals and yaw are by far the least effective in the Kmax. This is impart due to large surface area that is being moved and the although the “torque effect” works to cause the helicopter to yaw in the opposite direction , it is not nearly as effective as a standard tail rotor. Their are benefits to having no tail rotor, but it comes with a cost :) I hope this answers your question.
Great video.Would it be possible tofit a stub wing that would supply lift that would enable the aircraft to tilt forward thereby vastly increaed sped due to the stub wings complementing the loss of lift that I am assuming would occur in this mode?This would enable the wheels to retract into the wing reducing drag.If possible,this would surely give the Osprey competition on price,simplicity of maintenace.Yus sayin,Bob
The aircraft was designed for heavy lift, not economy. So, it has a fairly narrow market. That, and the million dollars per rotor blade set may have something to do with it.
@@skywagonuniversity5023 thanks. I've been searching but no luck yet. If it was the 3000 tbo that would be $660 an hour, so suspect they last 6000 to 7000 hours. Wood hey! Would love to see a video on their construction!
Kevin; I am at a "Loss" as to why the In-Flight Tracking Actuators are no longer used. Their NOT being utilized constituted a Red "X" or Grounding Condition, in the past. Now, a go-pro, in flight shows the Rotor Blades out of track and causing the thing to appear to beat the crap out of itself. Are there simply no parts to keep it up to date? I could track this thing, with the help of the Friction Dampers, to smooth as a Baby's Butt. Not only a smoother Coning Angle but.....the Fuel parameters were greatly improved. Just wondering.
Hello Zobee. We absolutely still use the in-flight tracking system. We just didn’t get into the details of that component in this video. There are two tracking motors mounted to each rotor head just below the blades which allow the pilot to visually track the blades in flight. A must in a Kmax :) Hope that answers your question.
They are angled away from each other. When it's flying you can see it, each blade passes over the other hub and the blades interlock between each other. .
If they went in the same direction they would hit each other in 45 degrees. When one set is east west, the other set is north south and they are angled outwards so that they can inter-mesh.
The sedan is just something we have laying about the hangar. The rotor wash won't scramble an egg, but it will dry out your laundry! Thanks for watching, Chet!
![Gunna - one of wun [Official Video]](http://i.ytimg.com/vi/w_JtBYqMgk8/mqdefault.jpg)
That guy did a hell of a job explaining the helicopter.
One of the best guest presenters I've seen on this channel.
Indeed he is. I told him so afterwards.
I had theories on how it yaws and he confirmed it as well as my concern that if you put more torque on one rotor than the other its going to roll as the rotor your putting more torque on moves to the vertical.
What a brilliant interview. The pilot could be a salesman for the unique and mission capable helicopter. Who’d have thought such a marvelous control system would allow this wooden rotor machine to lift twice its weight. Simply amazing!
I know. Of all the materials man has invented, it still uses wood. Amazing.
@@skywagonuniversity5023 And. I would bet there were White Men involved!
I was just teaching helicopter rotor systems to my ground class and someone asked how the K-Max worked. I wasn’t really sure until watching this. WONDERFUL explanation. Thanks you guys!
Thank-you, Mark and Kevin for taking the time to do this interview! 👍 👍
WOW!! They asked, and you delivered!! Super great job Mark. That's service my friend!!
Thanks again!
Kevin, the pilot did a sensational job of explaining this aircraft! Every minute was educational and interesting! Thank you so much for the opportunity to learn about the K-MAX helicopter!
Incredible tour of the K-MAX. These have always intrigued me; thanks so much for putting this together and thanks to Kevin for his time!!!
I've always had a fascination with the K-Max. This is by far the best explanation of one I have seen. Thank you Kevin and Mark!
Glad you liked it!
Excellent vid. Kevin was super clear and impressively knowledgeable
This was everything I always wanted to know about my favorite helicopter. Thanks Kevin for being so willing to share all the juicy details.
Amazing video. Probably one of the best I’ve seen in a few years. To the point, very detailed , no BS.
Glad you liked it!
I also found the pilot explained everything even a fixed winged pilot could understand what and how it fly’s. Great video.
Thanks for watching!
Another fantastic video, Mark. I love the simplicity yet wealth of information. Kevin certainly knows his machine inside and out as well as the history of it.
Glad you enjoyed it
An incredible aircraft! Thanks for the walk-around!
Wow, I enjoyed that. The pilot explained things so clearly and the questions really brought out the fascinating aspects of this aircraft. I came here because I just watched a video of a K-Max lifting a car from a frozen lake. The minders made everyone outside the helicopter practically lie down on the ground as the helicopter took off. Now I know why!
A very interesting machine.
This aircraft provides plenty of opportunity to talk about the differences between such vehicles and more conventional aircraft....and to appreciate the logic behind the variety of approaches.
Great job!! Kevin really knows his aircraft, and you know the questions to ask.
Just a fantastic video for a "propellor head" fixed wing pilot such as myself. Thanks Mark and Kevin!
I thoroughly enjoyed that. The little "tail strike gauge" under the rudder I reckon should be called a "tell-tail"! - As it will soon tell the "tales of woe" that the rear end endured if you were ham-fisted with the cyclic during landing! What an amazing and very clever lifting machine, that can lift more than it own weight, - WOW!
Wow! These are interesting machines indeed!!! Thank you, Mark!
You bet!
Amazing unique helicopter. Thanks for bringing it to us.
Another excellent video. Thank you.
Great video! And man are those confusing when you see one flying. Kinda hard to look away when it’s all whirling!
very interesting !! nice video - thanks Mark !
Thanks for the tour
Thanks for this great video. I see K-Max helicopters from time to time at my airport and I always wondered how they work.
The details of that drop bucket are a nice bonus bit of learning. Neat!
Very interesting design. Great tour and explanation indeed.
Very good interview,extremely informative. Thanks
This is the clearest explanation that I have ever heard of any rotorcraft. Thank you.
Extremely informative!!
What a fascinating machine! I've only seen these intermeshing types in books or films. It's interesting how they operate compared to a typical single rotor helicopter. I must thank Kevin for giving a most excellent explanation of the K-Max. This man knows his flying machine quite well!
One of your most informative videos well done! Thank you.
Glad you enjoyed it!
Great video, you both killed it. Thank you
Thanks. Kevin was very good at explaining it. I knew nothing.
Top tier interview and presentation by both sides. Thank you.
Glad you enjoyed it!
Outstanding video. Believe that ship did some time in Mariposa this fire season. The pilots and mechanic’s on all the K Max’s are an amazingly patient group of professionals. These unique ships just draw people to them and the crews are outstanding at explaining the concept’s that keep the rotors apart and control without a tail rotor.
Great video and amazing teknologi for the time is was invented. Kevin is a great explainer
That was super informative and what a great job explaining the helicopter! it’s not easy to be that clear and concise, almost seems like a k-max rep!
We could have talked with Kevin for several hours. Don the Camera Guy kept yelling at us, "Save it for the video!" Kevin really knows this aircraft.
That was awesome Mark!
Glad you liked it!
I really like it!
...how true, Kevin was great in his presentation of this aircraft. Having an owner/pilot that engaging really sets the video apart. And blades @ $1million a set, (!?) and made of wood no less, EEE GADS! Big thumbs up Mark!
Nicely done.
Fascinating and so well explained ! Such a knowledgeable pilot. 👍👍
Glad you enjoyed it!
Tremendous helio……i love those things….thanks for the info i always wondered about the type rating process for those.
Nice - very nice! Kevin is very well versed in this machine judging by his explaining. Thank you again Mark, for a top video.
P.S. Neat little cameo of the Skywagon....
Glad you enjoyed it
Ingenious design! Sleek too.
Very interesting and informative, I always thought these were Russian helicopters. They do have a similar machine. Many thanks for presenting this unique bird.
Excellent explaining, Kevin. Now I can fly it. Flying is easy, I have an MSFS2020 ... This is what my passengers are telling me. Oh, and of course the allmighty autopilot does the takeoffs & landings. 😉
Fly safely, Kevin. Stay vigilant.
Regards from far east. RS
Thanks for the video.
That was awesome
Excellent...
Tail rotor only takes about 10 %, NOT 30 %. but even that is a significant improvement of efficiency. The swept area of the blades is a lot more than usual for a helicopter of this power class (1350 HP), so the downdraft is lower intensity spread over a larger area. The characteristic of the Flettner intermeshing rotor system is that it tends to a stable hover, and requires pilot input to move, unlike most other helicopters.
Quite a few laws of physics are apparently still intact. Wonderful machine. Great video. Thanks.
Yes they are
Such a cool pilot...
Impressive machine
Kevin was one of the best interviewed pilots we have done and we have done some very good ones.
In case anyone is interested on the CH-47 Chinook yaw is by opposing left and right cyclic at the front and back rotor and fore/aft movement is by increasing collective on one rotor and decreasing it on the other. There is also a "longitudinal trim actuator" that applies fore/aft cyclic to both rotors but this is only used to pull the nose up in forward flight and push it down in hover (the CH-47 wants to hover nose high) and it's controlled by the electronics not the pilot.
Thank you for this.
The pilot was point on.know your machine!
Yes, he was.
Super interesting interview
Glad you enjoyed it!
Love to see that mixing box
Great video Mark. I bought a 172E with the O360 from you about a year and a half ago. I'm putting a new interior in it at the moment, and then it's going back on the market. I love flying this plane, but I don't fly it enough to justify the cost.
It will be very popular.
Great interview. Would have loved to have seen a few closeups of those blade ailerons and how they work. Interesting
That was spectacular.
We were very lucky to get the opportunity to make this video. Glad you liked it!
@@skywagonuniversity5023 could you put a few gopros on the k-max while it’s out working a fire please?
Fantástic.
K-Max: " The Aerial Truck "
Rotary version of the Transavia PL-12 Airtruk.... all the way down to lifting loads more than its own weight, and comparable top speed.
Choked on my soup when he said a million per blade😱🤣
And made of wood.
The only helicopter to have rotor trim tabs
That dude knows his machine!!
He was incredibly knowledgeable. We probably got half of what he told us.
Very interesting, gents! Thanks for taking the time to produce this video. Is that your company car, Mark? Very cool!
Ah, yes that is my commuter for work. I live three miles away. 1930 Model A Ford.
"Blade set is 1 million $." My mind will never comprehend that.
Swiss Team destroyed one in 2024. Fotos of crushed Blades here ruclips.net/video/g2Uk26Loc-c/видео.html Pilot is fine.
Cool!
So is that one-way strut a "Tattle-Tail"?
Had one of these pulling logs off BLM property next to the house......... I was Impressed to the MAX😁 My kinda aircraft.
Thats insane engineering
No, you have to be sane to do that type of work.
Every pilot should know his aircraft as well as this guy does his.
Very true
Had a helicopter doing weed spraying at my place this year. That pilot was spot on, but also knew everything about the chem he was spraying, such as it's toxicity to humans, aquatic life etc, persistence in the environment, and the history of its discovery and development.
Those pilots are info junkies!
Always wanted to fly one of these.
Me too but it only has one seat.
Excellent 'walkaround' Gents, thank you. Although trying to imagine the actual physics of this machine in flight, does leave me wanting a larger colouring book& more crayons. - eg. Is ground resonance 'a thing' with this rotor system, or at a million bucks per blade, does that kind of madness only affect your bank manager's desk legs?
Fabulous machine, a working madness to the benefit of all - in skilled hands, a marvel - but in mine, shameful wreckage : )
Ground resonance is usually a byproduct of lead/lag hinges falling out of sync. So I don't believe this rotor system is susceptible to that, at least in the traditional sense. Though it might still be possible since the wheels have oleo struts, usually not something you see unless impact dampening is required (the source of ground resonance).
Thanks to Mark for the video and thanks to Kevin for explaining the mechanics of the craft.
Check out the Flettner 282 'helicopter' which first flew in 1941.
The Flettner 282 had intermeshing rotors just like the Kamax.
Flettner was chief engineer for Kaman, builder of the K-Max
That vertical stab would look a lot better with a little bit of sweep
The whole thing is not very pretty.
Wonder what the TBO on the blades are? Learned to fly helicopters in a Bell 47D, also wood blades.
Can it auto-rotate during engine failure for a safe landing like a traditional helicopter? ( EXCELLENT video. ) To the pilot: thank you for your services.
All that and still wooden blades. Incredible. I figured they would have changed to at least like a composite coat around a flexible core
Amazing, all that technology and wood is the material used for the blades.
Question for someone. I gather the blade is solid wood (laminated) aside from an internal channel for the control rod. Where is the centre of gravity chord wise? On a single blade machine operated with a swashplate the CG is about 25% back from the leading edge. Excellent video thank you.
The rotor system was designed and first used by Anton Flettner in Germany (WW2). Kaman used the system on the Husky and K-max.
Flettner was an employee of Kaman.
That’s correct. After World War II, the US conducted “operation paper clip” which involved bringing the brightest minds from Europe over to the United States to aid in our lead of the arms race as we moved into the Cold War. One of these minds was Flettner. He was a key person in helping Charlie Kaman build and develop the H-125, H225, The Husky, and finally the Kmax.
Fascinating……Kevin really knows his stuff! Do you have any video of it flying??
Unfortunately, we were not able to fly it and it only has one seat.
Yup, I was just wondering if you had any video of it in the pattern…….
Wow I was in shock as well on the cost of a blade set.
$2 million in rotors. Makes you wonder what the rest costs, but if you have to ask ... it's probably out of the budget.
I think he meant to say that as they go higher the engine loses power so that is compensated by the excess power that isn’t normally available.
Great interview. But hey, how about a startup and flight demo!!!
I wish.......... I did ask.
Saw one of these machines at a secluded helipad behind tall bushes while I peed into the hedge on a long roadtrip across British Columbia.
Was such an alien looking machine, I had no idea what I was looking at. Thought it was some odd kit or prototype, not one of the most respected lift aircraft in the world. Amazing.
Also, what car is that in the background at the 17:00 minute mark?? Let's get a break down of that beauty!!
1946 Model A Ford. We'll make a short video on it as soon as we can.
Awesome interview and excellent explanations.
This aircraft has always intrigued me.
Just one question that was not asked.
Given a pair of blades is in the order of $1M, how much is the aircraft worth?
I think about 5 Mill.
Fascinating video Mark! My Dad worked for Charlie Kaman in the day ...they were friends..he came to to family cookouts I cant corroborate I was 1 or 2 ...My Dad worked on the Husky..Im very curious about what goes into to rotor blades on the K Max that cost 1m a set... What kind of wood what glueing process...
Most people don't know this, but Charlie Kaman and I went to different high schools together. True story!
Mark: one question I have that I wish you would ask your guest is, since the aircraft creates yaw by increasing the angle of attack on the rotors on one side, thus creating more lift on that side and the pilot has to use the cyclic to counteract that lift I surmise that the action of the cyclic doesn't create as much yaw as the increased angle of attack. Is this correct?
An addendum to this question is: is there a difference between how this helicopter's cyclic acts compared to a normal helicopter? Same for the collective?
Please would you have the pilot expand on this topic?
Kevin, Are you reading this?
Hello Robert. Good question. In regards to the flight controls, they all work similar to other helicopters. Pedals create a yaw movement , cyclic is directional control, and collective is mainly your up and down. Of the three inputs, pedals and yaw are by far the least effective in the Kmax. This is impart due to large surface area that is being moved and the although the “torque effect” works to cause the helicopter to yaw in the opposite direction , it is not nearly as effective as a standard tail rotor.
Their are benefits to having no tail rotor, but it comes with a cost :)
I hope this answers your question.
That is a strange looking bird!
Can't believe that huge helicopter has a rotax engine!
H aha ha
👍👍👍👍👍
Imo this is counter-rotating with style.
We agree.
Great video.Would it be possible tofit a stub wing that would supply lift that would enable the aircraft to tilt forward thereby vastly increaed sped due to the stub wings complementing the loss of lift that I am assuming would occur in this mode?This would enable the wheels to retract into the wing reducing drag.If possible,this would surely give the Osprey competition on price,simplicity of maintenace.Yus sayin,Bob
Possibly!
very impressive machine i just don't know why they don't build helicopter this way more often.
The aircraft was designed for heavy lift, not economy. So, it has a fairly narrow market. That, and the million dollars per rotor blade set may have something to do with it.
The only thing left out (that i wanted to know anyway) was lifetime hours on the blades. At $2m you would hope for many!
I'd expect at least 10 years or several thousand hours.
@@skywagonuniversity5023 thanks. I've been searching but no luck yet. If it was the 3000 tbo that would be $660 an hour, so suspect they last 6000 to 7000 hours. Wood hey! Would love to see a video on their construction!
Kevin; I am at a "Loss" as to why the In-Flight Tracking Actuators are no longer used. Their NOT being utilized constituted a Red "X" or Grounding Condition, in the past. Now, a go-pro, in flight shows the Rotor Blades out of track and causing the thing to appear to beat the crap out of itself. Are there simply no parts to keep it up to date? I could track this thing, with the help of the Friction Dampers, to smooth as a Baby's Butt. Not only a smoother Coning Angle but.....the Fuel parameters were greatly improved. Just wondering.
Hello Zobee. We absolutely still use the in-flight tracking system. We just didn’t get into the details of that component in this video. There are two tracking motors mounted to each rotor head just below the blades which allow the pilot to visually track the blades in flight. A must in a Kmax :)
Hope that answers your question.
Please help me out understanding that those blades don't hit the other engine.
They are angled away from each other. When it's flying you can see it, each blade passes over the other hub and the blades interlock between each other. .
@@skywagonuniversity5023 That's amazing
How can the rotor be 90 degrees from each other and counter rotate?
If they went in the same direction they would hit each other in 45 degrees. When one set is east west, the other set is north south and they are angled outwards so that they can inter-mesh.
@@skywagonuniversity5023 had a senior moment was thinking it was coaxial
What does a new Kma cost and where are they made ?
Made in USA and are very expensive.
17:03 What's the story on the antique sedan in background? Will the twin rotorwash scramble an egg?
The sedan is just something we have laying about the hangar. The rotor wash won't scramble an egg, but it will dry out your laundry! Thanks for watching, Chet!