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Model Forum / Radio Controlled / Helicopters / January 2008Short flight duration on Twister Medevac
Hi all, I'm new to the group and to R/C electric helis also, though I did have a short dabble a couple of years ago. I just bought a Twister Medevac heli and am getting on OK with it except that the flight duration between charges I'm getting are very poor. Typically I get just two or three minutes when the manual that comes with the heli states "10 - 15 minutes". Now I know the manual is likely to be optimistic (!) but this seems too wide a gap to be normal. Anyone any experience with this heli or can offer any advice? The charger appears to operate normally and takes about an hour to charge fully as the manual states. Any advice gratefully received! Regards, Tim. : Hi all, : [quoted text clipped - 19 lines] : : Tim. shagged battery. Those lipos are far too sensitive. > : Hi all, > : [quoted text clipped - 21 lines] > > shagged battery. Those lipos are far too sensitive. Well that's what I thought too Ian. But I think that's not the case. Today I bought a new battery pack plus a larger capacity pack (1600 mAh - double the standard pack supplied). These both suffer the same problem. You get a few minutes of proper flight and then the heli will barely get off the ground, even with full throttle. Anyone any other ideas? Cheers. Tim. : > : Hi all, : > : [quoted text clipped - 33 lines] : : Tim. any of the rotors even slightly damaged? > > : Hi all, > > : [quoted text clipped - 33 lines] > > Tim. For some reason people always thinks its the battery pack that's at fault when the flight times drop. Unfortunately they never consider it could be something else like binding on the inner or outer shafts, motor gear mesh is to tight on the main gear, the motors have lost performance or the 4 in 1 (or 3 in 1) unit has a fault. Reading another post a few up from this (See Nov 25) a Blade CX owner has had the same problem and it was 4 in 1 unit at fault. Cheers > > > : Hi all, > > > : [quoted text clipped - 45 lines] > > Cheers Thanks Richard (and Ian for the previous post). Yes, I do appreciate that other factors can affect flight duration. I have checked most of the points you mention and all check out OK. Oddly, the situation seemed to ease somewhat and flight times seemed better. Then I had a heavy crash! The result is that I am waiting for some spares to arrive before I can continue. One thought that did occur to me: Is it possible that the rotor pitch is a little too shallow? I guess this would have the effect of making the motors turn faster for a given lift, thus shortening battery life? Just a thought. Anyway, I'm grounded until a new set of top rotors arrive..... Cheers. Tim. : > > > : Hi all, : > > > : [quoted text clipped - 63 lines] : : Tim. Twister medivac is fixed pitch. It does have two sets of rotors? Surprisingly minor damage to the rotors badly affected the lift and stability. make sure the 4-1 unit is securely attached and that the chassis arm it sits on isn't bent up or down. > Twister medivac is fixed pitch. It does have two sets of rotors? > Surprisingly minor damage to the rotors badly affected the lift and > stability. make sure the 4-1 unit is securely attached and that the chassis > arm it sits on isn't bent up or down. Hi Ian, Yes I know there shouldn't be any variation in pitch. I remember reading in another forum though a post from someone who'd found it necessary(?) to twist the rotors slightly to increase the pitch. This wasn't the Medevac but a similar heli. It does indeed have two sets of rotors. I'll double-check the 4-in-1 unit as you suggest. Many thanks. Tim. G4wFT, Hello, Did you ever get to the bottom of the problem? I've had a Medevac for around a year with no problems but yesterda mine has started doing the same thing. Its def not a prob with the bat as I've got a brand new one and the power is cutting out after aroun 3.5mins on both my old and new packs. Both batts are only using about 300mah of the 850 after 3 mins. M money is on the 4in1 has a problem and its thinking that the batts ar getting around 3Volts and then cutting the power. Or im thinking maybe one of the motors is on its way out and causin some kind of problem -- looneylenn |
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