Extreme Flight Chinn Yak 55sp

[pani]

Personally I did not like the plane at 6" I am around 5-1/2 now and it still can do with a bit forward. I think 5-1/4 is the sweet spot.

[mstam]

	Quote: Originally Posted by pani
	Personally I did not like the plane at 6" I am around 5-1/2 now and it still can do with a bit forward. I think 5-1/4 is the sweet spot.

Confusing. Here in the last post someone mentions 7-1/2" even works fine.

To get it to 5 1/4" I'll have to mount the engine as much forward as possible. My tail servos are about 1/2oz heavier than standard servos so that might be the cause.

Edit: Asked Chris from EF and he says 6" is the sweet spot most fly it at.

[mstam]

Some pics. For power I used a 1100mah A123. 2x 18awg and 1x 22awg for balance charge up to 10A connected to a modified Deans charge jack (I added a third pin), and 1x 2-wire 22awg (max 4A w/o voltage drop) to a heavy duty switch.

[mstam]

First flight the elevator died. Tried to glue it together but it kept coming lose. I saw a lot of flutter.

[Craigsc5]

I haven't been following a lot of what you have here but from the photo of the break it looks like a good place to use a strip of carbon fiber, maybe on both top and bottom, what are your thoughts for repair or reinforcement?

[Dewayne Vaughn]

Did your failure occur at the hinge as it appears in the photo? And which side at the hinge failed first (if you can tell )

[mstam]

	Quote: Originally Posted by Dewayne Vaughn
	Did your failure occur at the hinge as it appears in the photo? And which side failed first (if you can tell )

Yes it failed just next to the outer right hinge where the balsa was slotted. Reconstructed it and added a strip of 1/32 plywood. Should be fine, haven't flown it yet.

[Dewayne Vaughn]

Your repair looks good!

I'd really look hard at changing props though... ( and maybe reinforcing the other side before it fails too.... )
Luck, Dewayne

[mstam]

	Quote: Originally Posted by Dewayne Vaughn
	Your repair looks good! I'd really look hard at changing props though... ( and maybe reinforcing the other side before it fails too.... ) Luck, Dewayne

I reinforced the other side as well. And why should I change props? The Vess 13x6 performs flawlessly. I use wooden props on all my planes. Xoar for electric, Vess for glow and gas.

[Dewayne Vaughn]

I'm sorry Martin, I meant less pitch. That plane ( design ) wont handle speed I'm thinking.

[mstam]

	Quote: Originally Posted by Dewayne Vaughn
	I'm sorry Martin, I meant less pitch. That plane ( design ) wont handle speed I'm thinking.

Not so much difference in speed between an APC 13 or 14x4W and the Vess 13x6. The difference with the Vess is that the YS 63 spools up within one second from idle to full throttle. Perfect for 3D.

The elevator broke on the very first flight where I only performed some light low-speed aerobatics.

[Dewayne Vaughn]

So maybe they just cut into the LE of the front elevator a bit too deep to support the brace piece? and then put the hinge next to it making it weak?

I'm just trying to understand why it failed.... and would like to hear your thoughts as to why it failed.
You're not a newbie so what you think matters.