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May 05, 2019, 08:46 PM
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Hamish.Scott's Avatar
Originally Posted by crossup
Scott great to see you using an Ermolin drive. But I'd like to caution you about the center of gravity.

My homebrew drive weighted 16 grams vs the Ermolin at ~10.5 g(I see you got the CF motor/15" prop version) and when I mocked up the components I was shocked to find it balanced at the recommended balance point with the servos mounted as shown in the thread. I had actually made an extra pocked to move the aileron servo behind the wing but of course did not need to do that as it turns out.

My point is with the much lighter Ermolin you will most likely end up rather tail heavy unless you move something. My servos were lightened as far as possible but did not replace the pot to pcb wires with magnet wires as it looked like I'd only save 20mg.
Oh and with my heavy motor my battery ended up at the leading edge of the wing.

You may not have an issue but I'd check thing before committing servo placement.
Hi mate, thanks for reaching out
Yep that what I had planned to do , going to get the airframe all done and do servo layout from there 👍
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May 05, 2019, 08:49 PM
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Hamish.Scott's Avatar
It has paint now
May 19, 2019, 05:17 AM
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Hamish.Scott's Avatar
Its done! what a great project!

RTF weight is 54grams as a 2S set up. Soon to be 1s if I enjoy flying it .

This is something I've always wanted to own as I've followed F3P for many many years, glad to finally have a top model What a great project, definitely had it's frustrations but lots of things learnt for the next build.

-Ermolin Contra drive
-Hitec HS5035HD aileron servo
-spektrum a2010s on tail
-Jeti Nano R7 Rx
-Yep 7 ESC
-Risto Hölttä Bec

Thanks to all my friends around the world for you help 🤙🙏
May 19, 2019, 07:26 AM
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crossup's Avatar
Great job, good weight for 2S
May 19, 2019, 08:45 AM
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Congratulations Hamish!
May 20, 2019, 05:20 PM
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Hamish.Scott's Avatar
got super impatient and just needed to see it work

crazy power definitely need to reduce the throttle end points
this was at 70% control rates and no expo. cant wait to get it in the hall now

Super Trino F3P first flight / Hover (1 min 25 sec)

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