Hi all,

I recently participated in a pattern comp and one of the judges pointed out that my model appeared to have two speeds ......too slow or very fast and he commented I should look at my power curve.

I just attach the servo to the throttle arm of the YS and don't worry about the 'curve"

Just wondering if anyone can share any info about setting up a power curve for YS motor

thanks in advance

Mavros

Hi Mavros,

The 185 has a power at low settings not comparable with any other engine, I guess you agree with that, so what I do is to adjust the curve to reduce the power on low stick positions, and pretty much adjust the speed of the aircraft to my liking with the throttle in the middle.

Regards

Alejandro

I set mine up the same as Alejandro.

First I set the throttle with a tacho. ie 1/4 of max. rpm = 1/4 stick position, 1/2 of max rpm = 1/2 stick position etc. I then adjust the curve to suit how I want the plane to fly. As Alejandro said, this engine has a huge amount of power/torque in the low to mid range, so needs the curve set to reduce how much the throttle barrel moves in relation to stick travel. Set it so that in level flight at your normal flying speed, the throttle stick is at half travel. In verticals I use up to around 3/4 throttle depending on conditions.

Prop selection will also play a big part in how well the engine delivers its power and how the plane flies. I'm currently using the APC 21 X 10 Carbon Fibre and it works extremely well.

Good advice IMO. That can be used for any engine/prop. Of course changing the prop ( I assume) will require changing the curve/rpm a bit to match the new prop.

I learned something again thanks to this forum!

Ken

Yes. I was using the APC nylon/glass 21 X 10PN and had to alter the curve when I fitted the APC Carbon Fibre 21 X 10PN.

Thanks everyone,

I have played around with my FUTABA transmiter and I set the stick position 5 % ahead of the servo .Hopefully this will give a more linear feel .
Weather cold and windy so no testing yet.


ps drac I have the carbon prop on order from CENTRAL HOBBIES in the US......much cheaper than APC...go figure however they are very slow to deliver

rgds

When I got mine they weren't available from CH, so I bought direct from APC. Afterwards I did see that they were around $20 cheaper at CH.

There are a few retailers that sell stuff cheaper than the manufacturer. RC Japan sell YS engines and spare parts 10 - 14% cheaper than YS. They are also less than 1/2 price than in Australia. I'm finding it's hard to get most YS parts here anyway now.
Freight is also cheap from Japan. Freight from Japan to Tassie is cheaper, ( and most times quicker), than Melbourne to Tassie.

Hi all,
Finally a good day for some testing of the Throttle curve.
First thing on Futaba Tx is to reduce the Expo on the throttle to Zero.This activates the curve.

I set the Stick movement 5% ahead of the servo and after one flight I didn't notice any difference .
I then set it at 10 % and the difference was very noticable to a point that it felt rather uncomfortable so I then reduced it back to 8%
Not sure yet if this is the ideal position.......more work in progress but it did give a more linear acceleration, smoothing out the initial high Torque of the engine.

regards

Mavros