Official Freewing Twin 80mm/90mm A-10 Thunderbolt II Thread

[Bazza]

OK something is definitely wrong, I maidened my plane the other day and I set the Cof G at 90mm exactly and even had a friend double check to make sure I had it correct. The minute the plane left the ground I knew I was in trouble as the rear of the plane would not lift up when I tried to level out and when I attempted the first turn the plane flipped upside down. I was able to get it right way up but on the next turn it flipped and then nosedived into the ground. Upon checking the wreckage, thinking the batteries had moved on take off the front battery was destroyed which started a grass fire, but the rear battery was found to still be attached to the plywood and still held tightly in place by the battery strap. both myself and my friend have many many years flying experience and neither of us could work out what the problem was except that the cog was too far back, but it was set at 90mm like everyone on here is recommending

[TScott]

That's odd. Something's "off" on your plane. Did the nacelles seat perfectly flush? Sounds almost like the front end of the nacelle assembly is raised a bit.

After I checked out the retract and repaired a door, I checked the nacelle and verified it is flush on all sides.

[themudduck]

I’m going to check it again before my next flight. For now, I have a nose gear retract to replace.

I agree, you're probably nose heavy. This model (and the nose gear) does much better with the CG moved back.

[xviper]

That's odd. Something's "off" on your plane. Did the nacelles seat perfectly flush? Sounds almost like the front end of the nacelle assembly is raised a bit.

[TScott]

Where is your CG? If at the manual recommended 78mm, this is too nose heavy. It flies much better at 86-90mm.

I’m going to check it again before my next flight. For now, I have a nose gear retract to replace.

[crxmanpat]

Where is your CG? If at the manual recommended 78mm, this is too nose heavy. It flies much better at 86-90mm.

[TScott]

Did you set the elevators at the recommended 3 to 5 degrees reflex?

Yes. I set the elevators per the manual and used the “pimples” on the tail as a guide. I have straight and level flight. It’s only when it breaks ground on takeoff or going full throttle on a aborted landing when slow.

[TScott]

Started with the elevators set to the recommended up trim lining up with the small ”pimples” on the tail.

Like I stated, it’s got nice level flight once up to speed. But full throttle on takeoff or to go around pitches the nose forward.

[TScott]

Did you set the elevators at the recommended 3 to 5 degrees reflex?

Started with the elevators set to the recommended up trim lining up with the small ”pimples” on the tail.

[TScott]

Did you set the elevators at the recommended 3 to 5 degrees reflex?

[xviper]

Thrust angle
With so many posts to search through, I need to ask….thrust angle….my A-10 is correctly balanced and requires no trim in flight. If I relax the elevator to much after take off, it noses over. If I do touch-and-go’s and add power before touching down the nose dives quickly. Does the upgraded power unit have a better thrust angle? Other solution?

Thanks!

Did you set the elevators at the recommended 3 to 5 degrees reflex?

[TScott]

Thrust angle
With so many posts to search through, I need to ask….thrust angle….my A-10 is correctly balanced and requires no trim in flight. If I relax the elevator to much after take off, it noses over. If I do touch-and-go’s and add power before touching down the nose dives quickly. Does the upgraded power unit have a better thrust angle? Other solution?

Thanks!

[Hugh Wiedman]

Quick video on my "Snow Hog" that I got out last week with a few other EDF's. This is definitely one of the most relaxing EDF's I have to fly. It's so stable and it's slow flight capability is unmatched, yet even the twin 80mm version has more than enough power do to any maneuver you desire. I'm flying it on 2 SMC 6200mah packs balanced around 18-20mm further back than book recommendation. I've set my timer for 5 minutes of useful throttle time (shutting off at 28%) so usually end up with 6-7 minutes of air time. Not bad for such a large EDF. If the real thing flies as nice as this model, I can see why our troops on the ground and our "Hog" pilots love this machine so much!

[Warthog]

I've been looking at the WeMoTec 89 mm, EVO Midifan EDF

https://effluxrc.com/WeMoTec-89-mm-EVO-Midifan-EDF-mfpEVO90.htm

Not sure how they would work. I'm running 8000 mAh batteries and 130 amp ESCs.

[xviper]

Who makes the most powerful (thrust) EDF 90mm ??? Thinking of upgrading. Thanks.

That's a bit of a loaded question. My suggestion would be to go to RC Castle and look up ALL the 90mm units they sell. Each one describes the thrust and at what amp draw. For mass produced (not specialty, limited production) EDF units, you can see 6s fans and 8s fans, which will be your most powerful units. However, the next question is whether or not the battery compartment will hold enough batteries to fly this thing for a reasonable length of time. Twin 8s battery sets that are at least 5000mah take up much more space than the equivalent 6s packs.

[Warthog]

Who makes the most powerful (thrust) EDF 90mm ??? Thinking of upgrading. Thanks.

[Warthog]

I'm glad for you.

[MikeT]

How much does your A-10 weigh? Mine is almost 17 lbs. with all the mods I have done.

I don't weigh my models. I've painted mine and did the strut upgrade. I also run 6000 MA batteries. I'm sure it's over the stock weight. As I said it's fine stock.

Mike

[Warthog]

How much does your A-10 weigh? Mine is almost 17 lbs. with all the mods I have done.

[MikeT]

Interesting!!! I just did a test of my A-10 thrust. It has 90mm EDFs. I tied it to a hook in the wall and put a fish scale in the line. It had 12 blade fans. It pulled at 11 lbs. 12 oz.. I swapped out the fans for 9 blade. It pulled 12 lbs. 14 oz.!!! I'm keeping the 9 blades in it. The bird is HEAVY and needs all the thrust it can get.

I find the stock set up more than adequate. Fly most of my flights at 1/2 throttle.

Mike