Tomahawk Futura Build Thread
10-10-2016, 09:34 PM
#203
Join Date: Aug 2005
Location: Lahore, PAKISTAN
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Setup below from the THD Manual
1. Heard this airplane requires a lot of down elevator while inverted, where as per manual the deflection asked to set is less than the UP stick movement?
2. What we know that to have axial rolls & reduced drag we always setup aileron going up with more deflection than the aileron going downwards, however it looks opposite in the manual! Or may be negative 17% differential compensates it?
1. Heard this airplane requires a lot of down elevator while inverted, where as per manual the deflection asked to set is less than the UP stick movement?
2. What we know that to have axial rolls & reduced drag we always setup aileron going up with more deflection than the aileron going downwards, however it looks opposite in the manual! Or may be negative 17% differential compensates it?
10-10-2016, 10:06 PM
#204
Not sure how the Futura ailerons are hinged but top hinging usually requires reverse differential (more down than up) to achieve straight rolls.
There are many different tests for correct differential but one of the easiest to carry out is to pull up to about 30 degrees so that you can apply full aileron for several rolls without needing to put in any elevator or rudder corrections. Watch the model carefully as it rolls say to the right. If it "walks" to the left it needs more differential (more up than down), If it "walks" to the right when rolling right it needs less differential. Do this in both roll directions as often there can be a difference in the amount of differential required.
Once you have set this, pull up at 45deg and half roll to inverted. Pull through a reversal and watch for any change in heading. Do this several times and if necessary tune the differential until there is no heading change.
Hope this helps,
Malcolm
There are many different tests for correct differential but one of the easiest to carry out is to pull up to about 30 degrees so that you can apply full aileron for several rolls without needing to put in any elevator or rudder corrections. Watch the model carefully as it rolls say to the right. If it "walks" to the left it needs more differential (more up than down), If it "walks" to the right when rolling right it needs less differential. Do this in both roll directions as often there can be a difference in the amount of differential required.
Once you have set this, pull up at 45deg and half roll to inverted. Pull through a reversal and watch for any change in heading. Do this several times and if necessary tune the differential until there is no heading change.
Hope this helps,
Malcolm
10-11-2016, 11:57 PM
#205
My Feedback: (2)
Setup below from the THD Manual
1. Heard this airplane requires a lot of down elevator while inverted, where as per manual the deflection asked to set is less than the UP stick movement?
2. What we know that to have axial rolls & reduced drag we always setup aileron going up with more deflection than the aileron going downwards, however it looks opposite in the manual! Or may be negative 17% differential compensates it?
1. Heard this airplane requires a lot of down elevator while inverted, where as per manual the deflection asked to set is less than the UP stick movement?
2. What we know that to have axial rolls & reduced drag we always setup aileron going up with more deflection than the aileron going downwards, however it looks opposite in the manual! Or may be negative 17% differential compensates it?
Yes, you'll need a bunch of negative aileron differential due to the hinging at the top of the aileron.
03-24-2017, 05:57 PM
#209
My Feedback: (16)
I have k 210 , I just experienced some thing weird on my 2.5 futura , while increasing the throttle to full , the mid section of fuselage collapses in , ( this is with the canopy on , has anybody seen this , it sounds to me it needs more air theu the intake ,?
Any suggestions??
Any suggestions??
04-04-2017, 11:40 AM
#213
Hello all,
I just picked up a 2.5 and I am really jazzed about it. Snowing here right now so taking my time and going through everything and have a question:
Has anyone had issues with these stock control rods and linkages? I usually use titanium turnbuckles but these have been here for a while with the previous owner with no issues and I don't want to change them just to be changing them, but if they are a worthwhile upgrade I will do it.
I just picked up a 2.5 and I am really jazzed about it. Snowing here right now so taking my time and going through everything and have a question:
Has anyone had issues with these stock control rods and linkages? I usually use titanium turnbuckles but these have been here for a while with the previous owner with no issues and I don't want to change them just to be changing them, but if they are a worthwhile upgrade I will do it.
04-14-2017, 04:24 PM
#216
Rudder: +/- 50mm
Elevator: +/- 30mm*
Flaps: 50mm Takeoff, 125mm Land
*You want the MAX down elevator you can get with little or no DOWN expo. It takes a lot of down elevator to fly this jet inverted and the throw is limited by the lower edge of the elevator hitting the rear stab spar. On the other hand, rudder is very effective and it will knife edge all day with half throw or less.
BTW, the stock linkage looks a little undersized but I used it and have never had a problem.
Craig
04-14-2017, 05:49 PM
#217
Pete, Have you tried here?
http://dragonplate.com/ecart/categories.asp?cID=290
or here:
http://www.f3aunlimited.com/hardware...and-stab-tubes
Last edited by RBardin; 04-14-2017 at 05:55 PM.
04-14-2017, 06:26 PM
#218
Aileron: +/- 25mm Hi Rate, 70% for low rate (exponential as you like it and maybe a little differential)
Rudder: +/- 50mm
Elevator: +/- 30mm*
Flaps: 50mm Takeoff, 125mm Land
*You want the MAX down elevator you can get with little or no DOWN expo. It takes a lot of down elevator to fly this jet inverted and the throw is limited by the lower edge of the elevator hitting the rear stab spar. On the other hand, rudder is very effective and it will knife edge all day with half throw or less.
BTW, the stock linkage looks a little undersized but I used it and have never had a problem.
Craig
Rudder: +/- 50mm
Elevator: +/- 30mm*
Flaps: 50mm Takeoff, 125mm Land
*You want the MAX down elevator you can get with little or no DOWN expo. It takes a lot of down elevator to fly this jet inverted and the throw is limited by the lower edge of the elevator hitting the rear stab spar. On the other hand, rudder is very effective and it will knife edge all day with half throw or less.
BTW, the stock linkage looks a little undersized but I used it and have never had a problem.
Craig