Apart from my goblin fireball havok edition that came with servos and esc and motor, my other helicopters I chose KST servos and they've been flawless.
I bought them the first time based on recommendations from experienced heli pilots. After that I started doing the research and they are a very good value:performance equation. I have limited flights so far so I can't assess longevity yet. I'll get there with time.
I use the same servoes in my 700 RAW, great budget servoes, never had any issues, also have same experience with the BLS815, another good budget brand is GDW BLS892/895 - 992/995, their last serie i haven't tested
This video is very true in most ways. But it has to be said when SAB call for a 8kg servo on the Kraken they specifically say 8kg per cm. This is important because it means that you dont need a minimum of 8kg torque, it means you need a servo with 8kg/cm. Meaning they already take into account that they will be asking you in the build to place ball socket at 17-18mm on the horn. So the actual force needed is much lower than 8kg torque you think you need. Thats a long winded way of saying when they ask for a servo of 8kg/cm they already know it will be around 4-5kg at the ball linkage. Theyre not saying it needs to be 8kg of torque at the ball linkage.
Have you come across a servo that has smooth movement? I have been looking for servo for pan and tilt camera, but most servos have jittery movement causing video distortion.
The manufacturer recommends PW27AH servos for that plane which are 27KG servos for $100. The KST915v2 makes 25Kg @ 8.4v. They are within 2g of weight and the KSTs are 15% cheaper + they're available. I had a hard time finding a source for their PW27AH.
Hi there, great video and great efficiency on way you provide info. When you mentioned speed, I hope no one gets confused and starts doing weird math like doubling the "speed" values read in servo manufacturer data, cause that "speed" is actually time.
Thanks it worked. John, I have a question, on the 7 min mark you are explaining torque etc. In your example, you're using cm instead of mm so: 2 cm = 0.787402'' or 25/32" whereas 2mm = 0.07874" or 3/32" not that it matters much.. Just wondering.
I don't understand your question. At 7m it's just showing the effect of changing the distance. The example was in CM, but when it came time to figure the actual force values, I used 1.7cm/17mm per the Kraken ball location recommendation. So I don't know what you're driving at.
No, when I tried to post, my phone just had the spinny thing. So I posted again. Then I saw your comment. It was close but I think you got me. I’ll get ya some day! 🤣👍
Great video! thanks John.
Thank you. Your servos fly all of my helicopters and they've never let me down.
Simply put, this is some of the best r/c info I have seen, and I have been in the hobby since 1972. Thank you sir!
Wow, thanks!
Excellent data driven decision tree. Thank you
Apart from my goblin fireball havok edition that came with servos and esc and motor, my other helicopters I chose KST servos and they've been flawless.
I bought them the first time based on recommendations from experienced heli pilots. After that I started doing the research and they are a very good value:performance equation. I have limited flights so far so I can't assess longevity yet. I'll get there with time.
Hey, Freddie, I was 16th to Like. Not a Heli guy but this was very interesting and will also be handy in planes. Cool stuff John.
Great video thanks for sharing the information sir.appreciated very much
You're welcome! Thanks for watching.
I use the same servoes in my 700 RAW, great budget servoes, never had any issues, also have same experience with the BLS815, another good budget brand is GDW BLS892/895 - 992/995, their last serie i haven't tested
Freddie will be using GDWs in his Specter 700. I'm a fan of KST at this point.
Thanks John very interesting video. Thanks
Thanks for watching
Another great video. Good information.
Thanks Woofie.
This video is very true in most ways. But it has to be said when SAB call for a 8kg servo on the Kraken they specifically say 8kg per cm. This is important because it means that you dont need a minimum of 8kg torque, it means you need a servo with 8kg/cm.
Meaning they already take into account that they will be asking you in the build to place ball socket at 17-18mm on the horn. So the actual force needed is much lower than 8kg torque you think you need.
Thats a long winded way of saying when they ask for a servo of 8kg/cm they already know it will be around 4-5kg at the ball linkage. Theyre not saying it needs to be 8kg of torque at the ball linkage.
What's the impact of Torque on responsiveness?
I imagine more torque wears the gears more too but is quieter than a quickly rotating tail servo?
Have you come across a servo that has smooth movement? I have been looking for servo for pan and tilt camera, but most servos have jittery movement causing video distortion.
What was the cyclic servo torque recommendation from SAB on the Kraken 580?
They didn't make one that I could find. They just say the Kraken flies well with mini servos.
What KST would you recommend for a Pilot 87” w/55cc engine?
The manufacturer recommends PW27AH servos for that plane which are 27KG servos for $100. The KST915v2 makes 25Kg @ 8.4v. They are within 2g of weight and the KSTs are 15% cheaper + they're available. I had a hard time finding a source for their PW27AH.
How many Kg's does a 700/800 class heli need on cyclic?
usually 20kg is enough
Hi there, great video and great efficiency on way you provide info.
When you mentioned speed, I hope no one gets confused and starts doing weird math like doubling the "speed" values read in servo manufacturer data, cause that "speed" is actually time.
Thanks for the info!
Where's your spreadsheet? You link to it is a 404
Looks like my hosting provider lost all of my public downloads. I reposted. The link should work again.
Thanks it worked. John, I have a question, on the 7 min mark you are explaining torque etc. In your example, you're using cm instead of mm so: 2 cm = 0.787402'' or 25/32" whereas 2mm = 0.07874" or 3/32" not that it matters much.. Just wondering.
I don't understand your question. At 7m it's just showing the effect of changing the distance. The example was in CM, but when it came time to figure the actual force values, I used 1.7cm/17mm per the Kraken ball location recommendation. So I don't know what you're driving at.
Gotcha thanks for the explanation.
I ran these calcs on my servos... :(
Haha! 9th.. But I hit the like button the most...👍🏻🍻👊🏻
First
Too bad is not programable. Maybe they think to this opportunity.
First
First
IDK Freddy, we kinda Tied I think. It was dang close for sure.
@@davidknutz3314 we need a ruling 🤔
Freddie won by a nose. It was close.
No, when I tried to post, my phone just had the spinny thing. So I posted again. Then I saw your comment. It was close but I think you got me.
I’ll get ya some day! 🤣👍