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Martin McIntosh14/07/2020 19:15:36
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3471 forum posts
1216 photos

Mine is 62mm from the wing LE and that is without a tank of fuel. Had a quite normal flight with it on Sun. and landed with 1/2 flap. Really just to check out the motor idle which I have had problems with.

DaveyP14/07/2020 19:28:20
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235 forum posts
47 photos

@Timc would I be right in thinking that was Strawberry fields ?

Tim C14/07/2020 19:48:31
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526 forum posts
278 photos

Yes Strawberry field

Peter Miller14/07/2020 21:04:27
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11206 forum posts
1321 photos
10 articles

If the CG is too far back (as it certainly looks) then control authority will be very much less and the model will tend to wallow about.Tis will make any very slight warps affect the flight more.

AS the old saying goes. If the CG is too far forward the model will fly badly. If it is too far back it will fly once!

Tim C15/07/2020 10:45:03
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526 forum posts
278 photos

I have checked the cg, it was on 65mm from front of LE, the black x, now moved about 8mm fwd , the pencil mark.

one wonders if the chord is measured from the front of the slat or the le. If you include the slat, the chord is 260mm, 25% would give 65mm from the front of the slat?

5bd98dd0-7afa-4490-8079-7a14d2cf7c00.jpeg

Peter Miller15/07/2020 11:04:40
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11206 forum posts
1321 photos
10 articles

Interesting.

My CG is 65mm from the leading edge of the wing.

Moving yours forward 8 mm should make it better because that video really looked as if it was tail heavy.

Tim C17/07/2020 14:36:24
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526 forum posts
278 photos

Success today, moved the CG fwd about 8mm and added a bit of right bias in the trim and side thrust and 20% rudder to aileron. Probably overdid this as it required left trim! All very sedate scale like and steady. Landing at a snails pace. Some fine tuning on the trims will help and some more cooling slots to the motor, the added lead is blocking the cooling exit, all in all well pleased, had a total of three flights.

YouTube

ken anderson.17/07/2020 15:24:02
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8710 forum posts
808 photos

well done Tim, looks like a different model, flying in the video.....sure it's not some one else's?... emotion

ken anderson...ne..1..success dept.

Trevor17/07/2020 16:48:12
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452 forum posts
57 photos

Congratulations Tim! Persistence was rewarded!

Trevor

Peter Miller17/07/2020 18:09:53
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11206 forum posts
1321 photos
10 articles

Well done!!

IT is interesting how a slight change can make so much difference.

Have fun now

Martin McIntosh17/07/2020 23:01:57
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3471 forum posts
1216 photos

Glad that you got it right in the end. Practice with the flaps at height.

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