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Slingsby T67 Firefly

Completing a kit

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kc15/07/2020 16:53:19
6575 forum posts
173 photos

That is quite a lot of watts per pound Redex -about 147 watts per pound and a lot more than Erfolg used in his. Will lead to quite short flights -perhaps 4 minutes at full throttle . Do you think it need that much power? and how does that compare to your other models like the AcroWot?

Erfolg15/07/2020 17:05:19
11781 forum posts
1340 photos

My model makes do on 700 watts. Perhaps that should be seen as more than adequate for a commanding take off, the rest of the flight is quite comfortable on half throttle, other than loops etc.

kc15/07/2020 17:22:46
6575 forum posts
173 photos

Erfolg - I thought you said 400 watts on 27th March?

Redex15/07/2020 18:10:24
164 forum posts

I think by the time that the prop/motor efficiency is taken into account, its actually about 120W/lb which is OK and should give good flight time on half throttle. I have tried to 'standardise' on my LiPo's but can always prop down. I'd rather have to much power than to little.

Erfolg16/07/2020 15:23:40
11781 forum posts
1340 photos

I will have to check, my book has circa 700 watts max. I would be surprised I could fly on half throttle on 200 watts. I need the power to deal with the often longish grass on out field, on take of.

I do not remember going from 3s to 4s, although it could be a reason.

At present I am undertaking a repair plus making some progress on a new build, tomorrow I should be clear.smiley

Erfolg17/07/2020 11:05:14
11781 forum posts
1340 photos

It is pulling almost exactly 400w, you are correct KC.

It is more than enough for what is supposed to be a trainer. Anything more would possibly frighten me. If I had 700w available, I would need a throttle curve that was exponential, so that the power dropped of dramatically as i approached mid throttle.

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