For all of the amazing "man made" materials that have been developed, it's always interesting when wood is still the best available material for a given application. The description of these props reminded me of how the skis they use in world cup/olympic races are made, which still have wood cores. Also, repairability and the ability to replace components is a great thing for manufacturers to be emphasizing.
Morning Scott , yes I guess the prop is in some ways like a wheel . With a racing wheel for an example you want to keep the rotating mass as light as possible . Thanks and enjoy Oshkosh
Thanks for the Video, Scott. Enjoyable as always. In fact MT has a new STC for the Bonanza- and Debonair-Guys out there. It’s a 3-blade MTV-9 for the IO-470K. Testbed was a 1970 F33. Gorgeous product!
Great PROP News Scott, I had to Chuckle ,not that their not out there but, anfib.Rabbits ...? just haven't had to Opportunity To see an eagle snatch one as it's swimming in the water ,We do have Jackalopes tho lmbo
Sold as a very durable and efficient prop. So does that mean, when your engine is at full throttle, and the prop is making a racket, decrease the RPM reduce the noise and obtain more thrust? 🌼💯
G'day Scott, Yay Team ! Brilliant Video..., but why can't this bloke simply say that they design the Blade's Structural Torsional Stiffness to be fine tuned resulting in an Aero-Elastic Modulus around the centre of Pressure, so that as the Airflow is deflected by Camber and Angle Of Attack, the relative High Pressure under the Trailing Edge has sufficient Effect as to twist the thinner, outer half to third of the Blade into a Finer Pitch, whenever Full Throttle is applied with sufficient Shaft-Torque to generate the Air-Loads on the Blades. Thus, a nominally "Fixed Pitch" or "Ground Adjustable" Wooden Propeller can be carved to be efficient in Cruise, while capable of adjusting it's Advance Ratio by +/- several degrees at the Tip - allowing Fine-Pitch at full Herbs, Climb-Pitch at 75% and Coarse Pitch at 60% Throttle settings. I first saw articles on the idea, explaining the "Scimitar" Propellers on the Onan-powered Bert Rutan Quickies...., in about 1977... That's some incredibly impressive Wood Joinery they're doing, more Marquetry than Lamination....; but there was a lot of Marketing Jism, too. That bit about using Square Block Laminae with Endgrains at 45° to their Flat Faces, placing the Grains perpendicular to the adjacent Blocks..., well it might be true... But, if you check my "Mad Scientist Videos..." Playlist for, "Home Grown Floorboards..." or "Quarter-Cut Chainsaw Milling..." I explain how to mill Trees into Quarter Cut Beams, which may then be cut into proper 1/4-Cut Planks with the End-Grains perpendicular to the Biggest Flat Faces of the Plank. Because Trees no longer grow sufficiently big as to be commercially Quarter Cut, only "Best Approximation 1/4 Cutting" is the best some Sawmills will do - but most "Backslab Cut" for maximum recovery of (cracking splitting twisting cupping bowing HORRIBLE) Timber from the Log... So, one might be inclined to applaud the innovation required to make a high-tech propeller out of Cross-grained Offcuts from a Sawmill making something else entirely (?) ! The Resin-Impregnated Wooden Propellers idea is pretty old, too...; I have a bit of a broken Laminae from the Hub of a Propeller which a local bloke named Neville Fakes brought home from Sydney University in 1936, when he studied under Lawrance Wakett, in the first Course of Aeronautical Engineering offered in Oz - he was a friend of my father...; anyway - the 1936 Test Specimen is Impregnated with Phenolic Resin....(!), and similar work was ongoing in Finland and Russia/USSR, too, back in the 1930s. Strange to tell, but a similar effect is encountered when a living Tree is killed by Lightning..., The Charge runs down the wettest part of the Bark, with the heat boiling the Water in the Bark and Sub-Bark and living "Sapwood" - resulting in a Steam Explosion which may shatter the whole Tree or merely blow off a big long vertical Strip of Bark. But the Resin in the True Wood in the rest of the Tree, throughout all the Xylem & Phloem Channels..., that gets instantly Electro-Set into something VERY like Polyester or Phenolic Resin. Then, when someone tries to harvest the dead tree decades later, the first tip is when the Wood is really slow to cut, and blunts the Saw without any Rocks or Dust being involved... One should quit at that point, because with all the Interior Channels blocked, with Electroset Resin, the Volatiles inside the Wood cannot flow out to the End-Grain surfaces to burn, so the effectively Fireproof Wood turns to Charcoal in an otherwise really hot Fire, or refuses to sustain a Convection Runaway when used without any other Fuel to sustain a fire. Maybe next year the Sales Pitch will include the Fireproof qualities imparted by Resin Impregnation (!). My Propeller Carving Tutorials are teaching olde skool techniques, in miniature scale, laminating little Hardwood 6-inch Airscrews for Stove-Fans (!)..., stashed in my "Personal Aeroplanology..." playlist. They show how to calculate Helical Pitch Angles for particular Diameter, RPM and Advance Ratio... So, yeah - and the Electro-grown Nickel-Steel Tip-Sheath totally blows my mind. I cannot guess at how expensive it must be to tool up to manufacture a Propeller like these people sell, nor how many Units would have to be sold, before breaking even on the Tooling-up process. All told, this was really fascinating ! Such is life, Have a good one... Stay safe. ;-p Ciao !
Great video ! Thank you!
For all of the amazing "man made" materials that have been developed, it's always interesting when wood is still the best available material for a given application. The description of these props reminded me of how the skis they use in world cup/olympic races are made, which still have wood cores. Also, repairability and the ability to replace components is a great thing for manufacturers to be emphasizing.
This is an excellent video, thank you!
Good presentation
Very good. thanks
Enjoyable and in your words fascinating segment thank you Scott
Great interview and review.
I have the 3 blade on a Maule M7 235. It has been working great! Thanks John!
Thanks for the video, I’ve been waiting on something besides a short, lol.
Time seems to slip away into the future....
@@FlyWirescottperdue I’ve been binge watching a lot of your old videos, glad I found your channel
Morning Scott , yes I guess the prop is in some ways like a wheel . With a racing wheel for an example you want to keep the rotating mass as light as possible . Thanks and enjoy Oshkosh
Very informative Video!
Very interesting and informative session,Scott. Shows the factors that are considered in the design of props to achieve optimum performance. Good job😉
Thanks for the Video, Scott. Enjoyable as always. In fact MT has a new STC for the Bonanza- and Debonair-Guys out there. It’s a 3-blade MTV-9 for the IO-470K. Testbed was a 1970 F33. Gorgeous product!
Excellent, enjoyed that.
I’d love one of their props.
That was brilliant!
Great PROP News Scott, I had to Chuckle ,not that their not out there but, anfib.Rabbits ...? just haven't had to Opportunity To see an eagle snatch one as it's swimming in the water ,We do have Jackalopes tho lmbo
Sold as a very durable and efficient prop. So does that mean, when your engine is at full throttle, and the prop is making a racket, decrease the RPM reduce the noise and obtain more thrust?
🌼💯
👍☑
G'day Scott,
Yay Team !
Brilliant Video..., but why can't this bloke simply say that they design the Blade's Structural Torsional Stiffness to be fine tuned resulting in an Aero-Elastic Modulus around the centre of Pressure, so that as the Airflow is deflected by Camber and Angle Of Attack, the relative High Pressure under the Trailing Edge has sufficient Effect as to twist the thinner, outer half to third of the Blade into a Finer Pitch, whenever Full Throttle is applied with sufficient Shaft-Torque to generate the Air-Loads on the Blades.
Thus, a nominally "Fixed Pitch" or "Ground Adjustable" Wooden Propeller can be carved to be efficient in Cruise, while capable of adjusting it's Advance Ratio by +/- several degrees at the Tip - allowing Fine-Pitch at full Herbs, Climb-Pitch at 75% and Coarse Pitch at 60% Throttle settings.
I first saw articles on the idea, explaining the "Scimitar" Propellers on the Onan-powered Bert Rutan Quickies...., in about 1977...
That's some incredibly impressive Wood Joinery they're doing, more Marquetry than Lamination....; but there was a lot of Marketing Jism, too.
That bit about using Square Block Laminae with Endgrains at 45° to their Flat Faces, placing the Grains perpendicular to the adjacent Blocks..., well it might be true...
But, if you check my "Mad Scientist Videos..." Playlist for,
"Home Grown Floorboards..." or
"Quarter-Cut Chainsaw Milling..."
I explain how to mill Trees into Quarter Cut Beams, which may then be cut into proper 1/4-Cut Planks with the End-Grains perpendicular to the Biggest Flat Faces of the Plank.
Because Trees no longer grow sufficiently big as to be commercially Quarter Cut, only "Best Approximation 1/4 Cutting" is the best some Sawmills will do - but most "Backslab Cut" for maximum recovery of (cracking splitting twisting cupping bowing HORRIBLE) Timber from the Log...
So, one might be inclined to applaud the innovation required to make a high-tech propeller out of Cross-grained Offcuts from a Sawmill making something else entirely (?) !
The Resin-Impregnated Wooden Propellers idea is pretty old, too...; I have a bit of a broken Laminae from the Hub of a Propeller which a local bloke named Neville Fakes brought home from Sydney University in 1936, when he studied under Lawrance Wakett, in the first Course of Aeronautical Engineering offered in Oz - he was a friend of my father...; anyway - the 1936 Test Specimen is Impregnated with Phenolic Resin....(!), and similar work was ongoing in Finland and Russia/USSR, too, back in the 1930s.
Strange to tell, but a similar effect is encountered when a living Tree is killed by Lightning..., The Charge runs down the wettest part of the Bark, with the heat boiling the Water in the Bark and Sub-Bark and living "Sapwood" - resulting in a Steam Explosion which may shatter the whole Tree or merely blow off a big long vertical Strip of Bark.
But the Resin in the True Wood in the rest of the Tree, throughout all the Xylem & Phloem Channels..., that gets instantly Electro-Set into something VERY like Polyester or Phenolic Resin.
Then, when someone tries to harvest the dead tree decades later, the first tip is when the Wood is really slow to cut, and blunts the Saw without any Rocks or Dust being involved... One should quit at that point, because with all the Interior Channels blocked, with Electroset Resin, the Volatiles inside the Wood cannot flow out to the End-Grain surfaces to burn, so the effectively Fireproof Wood turns to Charcoal in an otherwise really hot Fire, or refuses to sustain a Convection Runaway when used without any other Fuel to sustain a fire.
Maybe next year the Sales Pitch will include the Fireproof qualities imparted by Resin Impregnation (!).
My Propeller Carving Tutorials are teaching olde skool techniques, in miniature scale, laminating little Hardwood 6-inch Airscrews for Stove-Fans (!)..., stashed in my "Personal Aeroplanology..." playlist.
They show how to calculate Helical Pitch Angles for particular Diameter, RPM and Advance Ratio...
So, yeah - and the Electro-grown Nickel-Steel Tip-Sheath totally blows my mind.
I cannot guess at how expensive it must be to tool up to manufacture a Propeller like these people sell, nor how many Units would have to be sold, before breaking even on the Tooling-up process.
All told, this was really fascinating !
Such is life,
Have a good one...
Stay safe.
;-p
Ciao !
Did you happen to get the weight saving advantages for this prop?
About 30 lb
contact Auto-PSRU for prop speed reduction / variable pitch gear boxes and power plant upgrades
Is this prop suitable for seaplanes?
Yes!