Originally posted by xviper
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Official Freewing Twin 80mm/90mm A-10 Thunderbolt II Thread
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Originally posted by xviper View PostDid you set the elevators at the recommended 3 to 5 degrees reflex?
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Originally posted by TScott View Post
I’m going to check it again before my next flight. For now, I have a nose gear retract to replace.Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Originally posted by xviper View PostThat'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.
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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
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Hi Bazza, Please provide more pre-crash data.
- ***Exact method of CG measurement***(wheels down, wheels up, finger method, upside down, right side up, or details of a more precise method)
- Battery brand and size for weight info
- Exact details of battery locations before flight
- Any mods done? If so…what?
- Flaps down or up
- Control set-up…any mixing of flap-elevator
- Were you on high rate or low rate?
- Position of neutral elevator setting was what?
- What is your EDF and large EDF flight experience?
- Did you perform a range check and verify correctness of movement?
- Radio gear brand/model and location/any satellites?
- etc….
Sorry for your loss, but more data is needed because otherwise all the analysis can be is, “ Yep…you crashed.”
It does “seem” like a tail heavy condition, but don’t rule out radio or control set-up issues or pilot over controlling (to be blunt-pilots do cause crashes…not fun to state and not meant to be a slap in the face…but pilot experience can’t be ruled out with the info provided so far). I flew the A-10 as my first EDF after flying smaller/slower prop trainers and after having some stick time on the FL P-38. I will admit that the maiden wasn't pretty, and I busted the nose gear by getting into the dreaded crow hop on landing. Just saying.....gotta look at all possibilities since you asked.
-GG
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Originally posted by Bazza View PostOK 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
I do have one thought, and there may be some other control surface issues that are probably impossible to determine now (like maybe even a gyro correcting in the wrong direction??). I'm wondering if your elevator neutral position was set with too much up elevator. Keep in mind that this is one of the few EDF's that the twin exhaust thrust goes DIRECTLY over the elevators and those elevator stabs are only 8" behind the end of the exhaust nozzles. You will notice in static testing and when holding it that when you have anything over 50% throttle and input up elevator, the thrust pushes hard down on those elevators and you can even hear a major difference in the sound of the air going over the surfaces. So any up elevator will be magnified by increased throttle input. Down elevator, on the other hand, only is affected by air speed. I've notice with this bird that at full throttle, the elevators are extremely responsive to up elevator input for that reason, and less responsive (actually more like most aircraft) to down elevator input.
Long explanation made short, if you have too much up elevator trim for neutral, you will probably get exaggerated down force on the horizontal stab. Especially on take-off and climbing when you are most likely at/near full throttle, the additional up elevator you give for take-off will be exaggerated and relaxing to neutral if it's still too far up will exacerbate the condition. As you're going into a turn, you're not likely to use down elevator (usually you're using a little up to stay at the same altitude) and that too much trim along with the typical slight up elevator input may continue to push the tail down and most likely cause the plane to over rotate (and that's assuming each elevator is centered the same-any difference would add to the problem).
Anyway, I'm probably way out in left field on this one, but just a thought. Hope you get it worked out as it's a shame you were not able to experience the joy of flying this aircraft and unfortunately probably are left with a real bad taste in your mouth for it. Can't blame you for that, but if you can, get her fixed up and get back in the saddle!
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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Hey Bazza, sorry to hear of this incident. Something was definitely wrong, I can't imagine how tail-heavy it must have been to behave like that. Where did you measure 90mm from?
Should be about 3.5 inches back from the LE of the wing where it meets the fuselage.
We need more info - I would like to know where you put your batteries. Did they look like this picture?
Or did you have them both in the back tray?
Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Originally posted by themudduck View PostHey Bazza, sorry to hear of this incident. Something was definitely wrong, I can't imagine how tail-heavy it must have been to behave like that. Where did you measure 90mm from?
Should be about 3.5 inches back from the LE of the wing where it meets the fuselage.
We need more info - I would like to know where you put your batteries. Did they look like this picture?
Or did you have them both in the back tray?
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 Hugh Wiedman View Post
Damn Marc, that looks way more nose heavy compared to mine. I must be a good 120 mm further aft on the battery placement than you are....Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Hi guys! New A-10 RC pilot here. Does anybody know the estimated stallspeed (indicated) of this gorgeous plane? Setting it up with a pitot-tube to be able to ride the stall limit for slow and low loveliness. Yes, I am aware of the possibility of finding it out for myself, but right now I am pre-maiden, and would love to have some reference number to start of with.5 Photos
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Originally posted by Capt_RedBeard (NOR) View PostHi guys! New A-10 RC pilot here. Does anybody know the estimated stallspeed (indicated) of this gorgeous plane? Setting it up with a pitot-tube to be able to ride the stall limit for slow and low loveliness. Yes, I am aware of the possibility of finding it out for myself, but right now I am pre-maiden, and would love to have some reference number to start of with.
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