Slow Stick: not enough power with Futaba 9H radio - RC Groups
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Jul 07, 2005, 07:22 AM
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mhackney's Avatar

Slow Stick: not enough power with Futaba 9H radio

Hello all, I've been flying micro electric helis for about a year with a Futaba 9H radio. I recently assembled a SS to teach my son to fly planes. We tried to maiden the other night but the plane literally did not have enough power to get off the ground! We have the eps-300 and I was running 2cell LiPo (1200 mAh batteries (tried 2 packs). Running GWS receiver (6 ch pico), servos and a GWS 100 speed controller.

I suspect this is a radio programming issue since I have not really had to touch the radio program for a year. I did notice that I have the program set for a heli rather than acro. I have a tach but have not had the time to check the prop rpm yet. I hope to do that tonight along with reprogram the xmitter.

Does this make sense or is there something else I should look in to?

thanks in advance!
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Jul 07, 2005, 09:50 AM
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Wertygrog's Avatar
The only thing i can think of the usually grounds slow sticks is maybe the prop is on backwards? The lettering should be facing out.....those lipolys should make it fly no prob. ???

hey where's groton? I live south of boston near RI
Jul 07, 2005, 09:58 AM
Registered User
Ya with lipos you should be able to lose the SS in 20 seconds. An unscientific way to check the motor: when its full throttle is sounds like a house fan on high . I have the SS with a 300 and a 750 nimh and she rotates in less than 10 feet.
Jul 07, 2005, 10:38 AM
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Jason Paul's Avatar
Actually, I would think that a 2-cell lipo pack would leave the SS a little underpowered, but it should still probably lift off.

Check to make sure the prop is on correctly. The numbers should be facing forward. I think almost everyone has put one on backwards at least once.

Also, the speed controller is a bit small too.

As far as the radio being the problem, I have no idea there.

Jul 07, 2005, 04:35 PM
Oldie but goodie
Popsflyer's Avatar
1) Prop on backwards?

2) Radio set-up for Heli and governor mode? Governor mode use is common with electric heli's and will limit the maximum power (rpm) in an airplane.

3) The 300/350 version of the S.S. should fly fine on a 2S LiPo pack as fully charged voltage is about the same as a 7 cell NiCd pack. The 400 version would definately be underpowered on 2S and is great on 3S.
Jul 07, 2005, 04:36 PM
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crashingagain's Avatar
If your radio is in heli mode your settings might keep full throttle from being reached
Jul 07, 2005, 04:52 PM
kave_man's Avatar
the 2 cell lipo is fine for the ss. i have had one for 9 months.

300d with 12x6 prop
2 cell kokam 1500 ma
Jul 07, 2005, 07:11 PM
Registered User
mhackney's Avatar
Thanks all. Came home and took a look at the prop - it was on correctly. When I programmed the model on the 9H it defaulted to a heli. I tached the prop at 2620rpm at full throttle. I then reprogrammed the model as a plane (acro on the Futaba). Now I am getting 3460rpm and I did not hold at full throttle very long to get a stable reading since I was alone and the SS was trying to pull out of my hand. Wouldn't you know it, I started for the field next door and it started to pour!

Good news is, I came in and replaced all of that GWS tape with some good fiber reinforced tape on the control surfaces. The old stuff was pealing off. This new stuff looks like it will stay on.

Cheers and thanks,

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