Blackhorse Travel Air

The Beard
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03 Apr 2013 16:41 #121 by The Beard

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Tracks perfectly on the ground and on take off but when its in the air has dreadful left pull which does not change when dropping the power right down,Its not affected by engine revs just pulls sharp left in the air.All looks straight when fitted to gether

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Eric
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03 Apr 2013 17:12 - 03 Apr 2013 17:14 #122 by Eric

Replied by Eric on topic Blackhorse Travel Air

That sounds like a fuselage or wing warp.
First off, check for lateral (side to side) balance.
Take the wing off the fuz, put the two halves together, and look along the trailing edge. (assuming no dihedral!) - it should be straight.
If it's a dihedral wing, put it onto a flat surface, weighted in the middle. Fiddle around until both wing-tips are the same height above, at the leading edge, then compare the two trailing edges, and the two mid-spans, to see if they are the same.
Put the model back together, then compare the distance from leading edges to the top of the fin, and then to the leading edges of the tailplane.
If it all still looks straight, measure from the left main leading edge to the right tail leading edge, and then from the right main to the left tail, and see if that is the same!
Another (unlikely) thing to look for is that both wing halves are the same section! It has been known to get a mis-matched pair!

I've mentioned before that one model I built from a plan just didn't look right, then I realized that the left wing had one more panel in it than the right wing did, but the two halves were exactly per plan!

if you are calm and collected when all about you are going berserk - you've missed something important!

Last edit: 03 Apr 2013 17:14 by Eric. Reason: added a comment

Thanks: Klipkopwildlife, Sarah-Jane Smith

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Phil Wood
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04 Apr 2013 01:07 #123 by Phil Wood

Replied by Phil Wood on topic Blackhorse Travel Air

The Beard wrote: Tracks perfectly on the ground and on take off but when its in the air has dreadful left pull which does not change when dropping the power right down,Its not affected by engine revs just pulls sharp left in the air.All looks straight when fitted to gether

Ask yourself this ... if it does not change when dropping the power right down & is not affected by engine RPM .... does the sodding thing glide straight without an engine?????? ....... If not, it's probably warped. :lol:

I just own the forum .... you guys make it great thanks.

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Phil Wood
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04 Apr 2013 01:22 #124 by Phil Wood

Replied by Phil Wood on topic Blackhorse Travel Air

Old Fart wrote: Not strictly true Sarah, the actual cause of it turning left is the action of propwash on the fin and it is corrected with right side thrust and NOT engine torque.

If you're talking about the twisting motion of the air coming off the prop.... then this cannot apply according to Mr Newton ....Any twisting air would produce an equal and opposite reaction on the prop, thus turning the model in the opposite direction..... similar to trying to pick yourself up by your own boot laces.
Also ... any air turbulence is ironed out in the trimming for level flight ..... Just get the thing to glide straight first .... anything after that is extra trimming..... If it won't glide straight ... forget it! [badass]

I just own the forum .... you guys make it great thanks.

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Phil Wood
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04 Apr 2013 01:33 #125 by Phil Wood

Replied by Phil Wood on topic Blackhorse Travel Air

The Beard wrote: Tracks perfectly on the ground and on take off but when its in the air has dreadful left pull which does not change when dropping the power right down,Its not affected by engine revs just pulls sharp left in the air.All looks straight when fitted to gether

Try the aileron trim to the right .... the ailerons are trying to rotate the model & they can't do this on the ground .... once it's off the ground, they roll the beggar .... trim for a glide.

Pol.

I just own the forum .... you guys make it great thanks.

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old fart
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04 Apr 2013 10:44 #126 by old fart

Replied by old fart on topic Blackhorse Travel Air

Polyphilla wrote:
Old Fart wrote: Not strictly true Sarah, the actual cause of it turning left is the action of propwash on the fin and it is corrected with right side thrust and NOT engine torque.
If you're talking about the twisting motion of the air coming off the prop.... then this cannot apply according to Mr Newton ....Any twisting air would produce an equal and opposite reaction on the prop, thus turning the model in the opposite direction.....

Not true Pol, if you watch the prop wash from a model in the ground at full power you can see the grass being blown and it's not going straight down the fuselage, and Newton's law doesn't apply because what we are talking about is a completely different phenomenon.

There is nothing like a dream to create the future.

Electrickery is the work of the devil.

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04 Apr 2013 11:06 #127 by Ex-Member

Replied by Ex-Member on topic Blackhorse Travel Air

my twin did the same.
tracked dead straight on the ground, but once in the air it turned left and then rolled.
turns out it was an aileron problem, one was warped slightly.

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The Beard
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08 Apr 2013 20:44 #128 by The Beard

Replied by The Beard on topic Blackhorse Travel Air

Thanks for the replies I will investigate all your points and report back.I have a couple of ideas which have been ignited by your valid comments

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The Beard
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03 Jun 2013 19:30 #129 by The Beard

Replied by The Beard on topic Blackhorse Travel Air

I admit I havent looked into this one ,Im hesitating as to whether to bother.

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The Beard
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10 Jun 2013 04:32 #130 by The Beard

Replied by The Beard on topic Blackhorse Travel Air

As yet I havent seen anything visually thats a problem.I bought it at the nationals bring and buy and it looked pristine,maybe thats why the guy sold it.I havent given up yet but like Mclaren Im struggling for an answer

Thanks: Eric

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The Beard
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18 Oct 2013 17:35 #131 by The Beard

Replied by The Beard on topic Blackhorse Travel Air

Gave up on this one ,its in the shed

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alan cantwell
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18 Oct 2013 18:51 #132 by alan cantwell

Replied by alan cantwell on topic Blackhorse Travel Air

shame to bin a decent plane, for want of a tad of investigation, some decent views above, just cos it will take 5 minutes, lateral balance the wings, see if one panel is heavier, then site each wing panel fromm the rear, is one twisted, side or down thrust wont make a lot of differance on this aircraft. its worth investigation,

i have 2 sides
no you dont,
yes i do,

Thanks: The Beard

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The Beard
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18 Oct 2013 19:52 #133 by The Beard

Replied by The Beard on topic Blackhorse Travel Air

I agree Alan.The u/c came off last time out,Ive nicked the Receiver for the acrowot but apart from that its still complete.Everything looks straight and it has me beaten.May have a look during my recovery time

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alan cantwell
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18 Oct 2013 19:59 #134 by alan cantwell

Replied by alan cantwell on topic Blackhorse Travel Air

undercart is minimal, but before its repair, check the bits i, and others, have mentioned, might be just something simple, i would love to put an incidence meter on the wing, to check if there is a twist

i have 2 sides
no you dont,
yes i do,

Thanks: The Beard

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Garry Pollard
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18 Oct 2013 20:31 #135 by Garry Pollard

Replied by Garry Pollard on topic Blackhorse Travel Air

I have the Speed Air Stephen and that is only a trike U/C difference to your tail dragger, and I dont have this prob. As others have said, it HAS to be a twist on wing, fuz etc. As Alan rightly said such a shame to bin a good model for want of a bit of investigation. You never answered the question "Does it glide" That would give us a clue .
Garry

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