Originally posted by xviper
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Official Freewing MiG-29 Fulcrum Twin 80mm Thread
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Originally posted by GliderGuy View PostHi Gary,
What altitude and temperatures are you indicating these airspeeds? I would like to roughly calculate the approximate true airspeeds. Some have reported GPS-measured speeds in the range of 125 mph when level and full throttle.
-GG
I haven't done an ICE-T problem since pilot training in the 70's. I always got TAS by flipping the switch on my HUD from C to T and just read the number! Good luck.
I was flying near Bowman, SC yesterday. Temp was 70 F, Wind calm, Pressure was 30.10, and field elevation is 100' MSL.
I was getting verbal telemetry call outs from my Jeti DS-24 generated out of a Digitech SB-IAS sensor. My friend Dave who wrote the LUA program for the speed call outs has bench tested several RC telemetry sensors with lab instruments and says this one is very accurate. It is the one used for the Digitech CTU auto throttle function. I'm sure I'm just getting raw IAS and is not calibrated but its probably close at the speeds I was flying.
I make it a point not to fly my foamy turbine conversions too fast. I used to get 100mph with my F-22 on 8S so that's where I set my overspeed warning for the turbine conversions. I haven't tapped that much with the Mig-29. 60-80mph feels like the sweet spot at mid range thrust settings for most or my flying. I easily fly for 7-8 min with the fuel available and the Mig is a very comfortable jet to fly. It's a lot of fun.
Gary
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Originally posted by kallend View Post
Reflex reduces the pitching moment of the wing so the tail doesn't need to generate so much downforce. This will reduce the loads both on the servos and on the tail structure.
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Originally posted by kallend View Post
Reflex reduces the pitching moment of the wing so the tail doesn't need to generate so much downforce. This will reduce the loads both on the servos and on the tail structure.
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Originally posted by xviper View PostSo, can it be said that in the case of this plane, it's like the opposite effect as when flaps down causes "ballooning"? You have to apply down elevator to compensate. When reflex is used here, some up compensation is dialed in.
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Originally posted by xviper View PostSo, can it be said that in the case of this plane, it's like the opposite effect as when flaps down causes "ballooning"? You have to apply down elevator to compensate. When reflex is used here, some up compensation is dialed in.
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Originally posted by radfordc View Post
As far as "ballooning" when flaps are lowered that's a different thing. Lowering flaps can increase the wing nose down pitching moment which you would think would require more tail down force (up elevator to compensate). But, often, as you note you need down elevator to compensate for flap deployment. This can be due to a couple of reasons....increased camber of the wing causes the wing to lift more; and, the flaps induce a downward flow over the horizontal tail causing the tail to produce more down force,Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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160mm CG
Originally posted by viper1gj View PostI moved the CG back to 160mm and have 3mm reflex on flaps and ailerons. With the CG back to 160mm it flies even better now.
And big congrats to that great conversion you made, very impressive!
Cheers,
Henrik
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Originally posted by HK111 View Post160mm CG
And big congrats to that great conversion you made, very impressive!
Cheers,
Henrik
I just hung all the rails and missiles on the wings today and rechecked the CG with the Xicoy CG machine. I found the CG shift was 2mm aft so now at 162mm. Based on my recent flights this weekend at 160mm I think it will be fine at 162mm. I will test next weekend and report back.
Gary
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I posted this on RCG also, but wanted to get opinions here also:
If I use ProModeler DS150CLHV servos for the stabs plugged directly into the Rx, retain all the other original servos, use a castle 20 amp Pro and run everything at 5v, what 2s LiPo should I use to fly at least 2 flights safely? I will most likely be using a Cortex gyro, which also uses some power. I've never used an external BEC before.
The BEC battery will need to power an after burner also.
I already have two of each of these:
Admiral 1300, 30c
Roaring Top 2200 25c
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Originally posted by RC Rich View PostI posted this on RCG also, but wanted to get opinions here also:
If I use ProModeler DS150CLHV servos for the stabs plugged directly into the Rx, retain all the other original servos, use a castle 20 amp Pro and run everything at 5v, what 2s LiPo should I use to fly at least 2 flights safely? I will most likely be using a Cortex gyro, which also uses some power. I've never used an external BEC before.
The BEC battery will need to power an after burner also.
I already have two of each of these:
Admiral 1300, 30c
Roaring Top 2200 25c
If buying new, I would look at 500-800 mah for this purpose. But as always, try.Freewing A-10 turbine conversion: http://fb.me/FreewingA10TurbineConversion
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Re-maidened mine over the weekend after my re-paint. Moved the CG back to 165mm and I won't be looking back.
Video of the painting/airbrushing process for those who are interested:
Repaint of the Freewing Mig 29 "Fulcrum" twin 80mm EDF jet. This project called for a mixture of rattle cans and airbrush. As always, the airbrush colors a...
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Originally posted by krakenreleaser View PostRe-maidened mine over the weekend after my re-paint. Moved the CG back to 165mm and I won't be looking back.
Video of the painting/airbrushing process for those who are interested:
Repaint of the Freewing Mig 29 "Fulcrum" twin 80mm EDF jet. This project called for a mixture of rattle cans and airbrush. As always, the airbrush colors a...
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Originally posted by krakenreleaser View PostRe-maidened mine over the weekend after my re-paint. Moved the CG back to 165mm and I won't be looking back.
Video of the painting/airbrushing process for those who are interested:
Repaint of the Freewing Mig 29 "Fulcrum" twin 80mm EDF jet. This project called for a mixture of rattle cans and airbrush. As always, the airbrush colors a...
Hugh "Wildman" Wiedman
Hangar: FL/FW: Mig 29 "Cobra", A-10 Arctic, F18 Canadian & Tiger Meet, F16 Wild Weasel, F4 Phantom & Blue Angel, 1600 Corsair & Spitfire, Olive B-24, Stinger 90, Red Avanti. Extreme Flight-FW-190 Red Tulip, Slick 60, 60" Extra 300 V2, 62" MXS Heavy Metal, MXS Green, & Demonstrator. FMS-1700mm P-51, Red Bull Corsair. E-Flite-70mm twin SU-30, Beast Bi-Plane 60", P2 Bi-Plane, P-51.
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Originally posted by Icarus the 2nd View PostMaiden flight and 2 more flights done today. Had a strange problem though in the 3rd flight. Here's the vid from that 3rd flight.
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The thrust line is such that keeping full throttle after a pitch-up at take-off is going to require some down elevator to counter the thrust line. Did you use the same take-off technique on the 3rd flight? In the video, it appears you may have been behind the pitch-up after take-off. If you want to keep full power right after take-off, use the technique of going into a bank after lift-off. This will minimize the amount of pitch-up you'll experience while staying at full power. It looks cool, too!
-GG
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