Wow, I'm getting 4 minutes with 25% left. You do know that the left stick moves both up and down? LOL
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Originally posted by F106DeltaDart View PostWhat packs are you running?Pat
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Originally posted by crxmanpat View PostWow, I'm getting 4 minutes with 25% left. You do know that the left stick moves both up and down? LOLFF gliders and rubber power since 1966, CL 1970-1990, RC since 1975.
current planes from 1/2 oz to 22 lbs
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Originally posted by crxmanpat View PostI'm using RoaringTop 5800 35Cs and XPS 5200 45Cs. Both of these are great for the F-14 as they are longer and skinnier than most 5000 packs, weigh less than most 5000s, and fit perfectly in the F-14 without any modifications to the battery bay.
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Hey Gibbo. I do not own the Mig21 but since you havnt received any advice on the cg looking at the wing configuration i would balance it upside down. The best thing to do though would be to pm xplaneguy or rcjetdude or deltadart or crcmanpat or TI. All of these gentlemen are quite the experts as well as alot l have failed to mention not because they are not experts in edfs but the list is way to long. One will definatly get you on the right path.Dewey l
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Originally posted by Dewey H Lee View PostHey Gibbo. I do not own the Mig21 but since you havnt received any advice on the cg looking at the wing configuration i would balance it upside down. The best thing to do though would be to pm xplaneguy or rcjetdude or deltadart or crcmanpat or TI. All of these gentlemen are quite the experts as well as alot l have failed to mention not because they are not experts in edfs but the list is way to long. One will definatly get you on the right path.
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Originally posted by GIBBO View PostHi need advice on free wing mig 21 when carrying out centre of gravity test do you have the plane upside down or right way up thanks Paul
Generally low wings stay on the balancer (or your finger tips if you are like me) better upside down. Likewise, high wings do better right side up.
The finger tip method works. My jets generally come off the boards needing ZERO trim.
But as far as Cg is concerned, the Cg doesn't care either way. Find a way to balance the bird that you can do and get repeatable results. I like the finger tip method.
crxman the twins are more efficient.
Meridian Aeromodelers, Meridian MS
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Originally posted by F106DeltaDart View Post
It's a good solid flyer. Steady and easy with wings out, and a bullet with the wings swept. The only downside is the flight time. I get about 2.5-3 minutes maximum right now, landing at 15%.
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Originally posted by crankestein View Post
Thats what many dont post about their awesome airplanes. I just could not deal w such little time to fly, not so cool after all.
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Originally posted by seaviper View Post
The only reason you would balance right side up verus upside down is to prevent the model from falling off whatever your are using to balance it.
Generally low wings stay on the balancer (or your finger tips if you are like me) better upside down. Likewise, high wings do better right side up.
The finger tip method works. My jets generally come off the boards needing ZERO trim.
But as far as Cg is concerned, the Cg doesn't care either way. Find a way to balance the bird that you can do and get repeatable results. I like the finger tip method.
crxman the twins are more efficient.Aeromaster 35% Extra 260 (under construction), Hanger 9 40 size P51, SIG Somethin' Extra, Hanger 9 40 size Super Stick, Eflite F4U-1A Corsair, Eflite Carbon Z Yak 54, Freewing Panther F9F, 1/5 scale Piper L4 (in box), Addiction XL (in box), Parkzone Super Cub, Eflite UM's F-16, P51, Revolution & Spitfire, Durafly Das Ugly Stick, Twisted Hobbys Crack Yak & Mini Crack Yak, Align T-Rex 600, Motion RC Avanti (under construction)
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Originally posted by crankestein View Post
Thats what many dont post about their awesome airplanes. I just could not deal w such little time to fly, not so cool after all.
EDF requires 1.5X the watts per lb of aircraft for the same flight performance as the conventional 2 blade prop in the nose (all else being equal... and its not)
The EDF unit itself is a heavier way to mount the motor than the common firewall mounting of a brushless outrunner.
So you are starting with a model that has a weight penalty and a higher power demand. Then we demand that the EDF models fly faster than the conventional prop models, being less than happy with any EDF model that can't exceed 100 mph.
Then lets add that heavy swing wing system to the F-14.
You have the choice at this point of adding a LOT of battery weight to get duration (thus losing maneuverability and increasing minimum speed to maintain controlled flight) or accepting reduced flight time.
Even accepting the appx 3 min average flight time, the Freewing F-14 is a heavy aircraft, requiring a long runway.
The actual mini-turbine powered models suffer similarly from the weight and power requirements to get the performance desired. Those tiny turbines can burn a gallon of kerosene in under 12 minutes (some burn a lot more). Most can't carry more than 4 minutes of full throttle fuel.FF gliders and rubber power since 1966, CL 1970-1990, RC since 1975.
current planes from 1/2 oz to 22 lbs
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