Agreed! Just curious
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Official Freewing MiG-29 Fulcrum Twin 80mm Thread
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After adding 120 g of lead to the tail the CG is about 10-15mm aft of the wing marks with two 6000 packs (850 g each). Yes, she's a big pig for sure but the flights are good. With no wind the takeoff from grass was uneventful. It flys smooth and stable with good speed and enough vertical to pull big loops. Flight timer set to 4:00 and batteries are fine upon landing. After two dozen flights I've decided that it probably isn't going to dive into the dirt at any moment. I use half flaps for takeoff and immediately retract them. I don't drop the flaps for landing until the gear is down and speed is slowed significantly.
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Originally posted by Yellowbird911 View PostIt may be in here somewhere but can't find it. Has anyone had an uncontrolled dive that have upgraded to higher torque servos. Not the Freewing higher torque but something with 2 to 3 times the torque. The fellow on Youtube that put a K55 in his has got to be doing over 125mph but has larger servos.
My top curiosity for the K55 guy and the guy with the 8s system would be ................. what would have happened if the flaps were deployed during those high speed runs, even 1/2 take off flaps? (Not that I would advocate either of them to try it just to satisfy our morbid curiosity.)
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Originally posted by Evan D View PostThe big MiG has really good energy retention. On 6000's I'm getting 6 minutes, take off roll to full stop on the runway.
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Originally posted by xviper View Post
My top curiosity for the K55 guy and the guy with the 8s system would be ................. what would have happened if the flaps were deployed during those high speed runs, even 1/2 take off flaps? (Not that I would advocate either of them to try it just to satisfy our morbid curiosity.)
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Originally posted by radfordc View Post
I'm not far off that. I fly until the timer goes off at 4 min. By the time I get the gear and flaps down, fly the approach, land and taxi in I'm over 5 min. Last flight my batt was still above 25% so I've got a little cushion if needed.
A 4 min flight keeps my charge time to a little less than an hour (6000). This is perfect for my battery/charger set-ups. Last flight of the set = first batteries almost ready to go. I put in a few P-38 flights after the last MiG flight for good measure and a little time pad between MiG sets.
4 min allows for hot doggin’ too. But everyone’s flight styles are different. Best to keep an eye on the after-flight cell voltage and decide for yourself.
-GG
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Originally posted by GliderGuy View PostFor the exhaust nozzle touch ups, I got a close match by mixing the following in the approx ratios. You will need to eyeball it:
TIMIYA TS-29 / 90% / semi gloss black
TIMIYA TS-30 / 15% / silver leaf
TIMIYA AS-14 / 5% / olive green (USAF)
If anyone has an exact match, please post.
-GG
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Originally posted by GliderGuy View PostFred’s video and Borat’s photo = I’m done making upgrades after the CF sheeting on the bottom back there to harden the structure (against possible glue joint separation) for an extended number of flights.
Originally posted by mshagg View PostFor sure, the root cause appears to be extreme force in certain situations. I guess it's the mode of failure which is the question. Servo overloaded? Mechanical binding? Surface effectiveness when it takes on the shape of a bannana? Regardless, efforts to support this area of the fuse should head most of them off.
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Hi Airguardian - The stab deformation was max in the flaps down/high speed/dive part of the video....not going there! Also - I am concerned about inducing flutter if messing with the stab mass balance.
How are you avoiding the potential for flutter if changing up the FFS? Re-mass balancing? Should this be a concern? YouTube shows various RC birds eating dirt when they flutter!
Looking at the base of the vertical stabs and tips of the rudder photo published later by Fred....not seeing much housing / structure deformation. Mainly FFS deformation. That’s why I added CF only to the bottom to stave off rectangular box / foam glue joint separation.
-GG
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My buddy Keith (Yellowbird911) and I working on K-45 turbine conversion have upgraded out stab mounts using this method and it stops the flexing and twisting of the stab mounts. Used 6mm aluminum rods 190mm long to anchor the stab pivot rod into the nozzle using E6000 glue. I found the RustO spray dark bronz metalic to be a close match for the nozzle color. The Tamiya X-10 Gunmetal matches the silver covers forward of the nozzles.
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Originally posted by Jet jocky View PostReinforced the elevator mounting area on my mig. Used 1/32 ply on the inner and out sides and also the bottom. Sanded and used 30 min epoxy.
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