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Post by jasong911 on Feb 17, 2011 14:24:50 GMT -5
I'm building a 550 and have read about a million posts about gearing, so, of course, I need some clarity. I've got a Scorpion 3026-1600 and need some advice. I've read about guys running the 550 with the -1400, but not the -1600. Don't need 3d headspeed here. Running a Gaui 60amp ESC (I think its a 60...). Batteries, for now, are a pair of Voltz 3s 2200 25c packs. I might want to mention that I'm at 6000 feet elevation here on the west side of Denver.
Does the current $79 kit come with the thrust bearing equipped tail blade holders?
Thanks and Great board!
--Jason
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Post by dunkonu23 on Feb 17, 2011 16:31:50 GMT -5
One thing's for certain... you're going to have a lot of head speed, so I think you need to be careful with the stock gearing... which if I recall correctly is 13 tooth pinion 19 tooth OWB, 50 tooth front main and 61 tooth rear main. With that and 22.2 volts, you're around 2500 rpm and that's a bit on the dangerous side with the stock plastic head. When you buy your kit, I would order the 60 tooth front main, as well. That will bring it down to around 2100 rpm. But in all honesty, I don't think the motor can take the kinds of loads you'll be generating. Be careful with your batteries. You've basically got a 425 setup so the batteries will drain quickly.
No, unfortunately the stock tail grips aren't thrusted.
Scott
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Post by jasong911 on Feb 17, 2011 18:40:33 GMT -5
I have enough parts (without electronics, and a few odd and ends) to build 2 of the darn things. Probably should just build it as the 425, then build up the 550 as I get experience. Do I need to govern the headspeed if I go 425?
Thanks for the help, Scott!
--Jason
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Post by dunkonu23 on Feb 17, 2011 21:13:53 GMT -5
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Post by jasong911 on Feb 17, 2011 23:43:12 GMT -5
I do have the 550 stretch kit. Guess I'll see if my LHS will trade the motor... tail servo not here yet anyway.
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Post by Jerrymac on Feb 18, 2011 1:08:39 GMT -5
Well, I guess I will throw in my 10 cents here. (Inflation you know).
I don't think your higher elevation will have much effect on a collective pitch helicopter. I have read about guys having a lack of lift at higher elevations with fixed pitch helicopters though.
The 1600kv motor will work fine for a short boom set-up running 425/430mm blades. For a long boom and 550 blades I would agree with Scott on using one of the motors he mentioned above. For mild sport flying you only need a head speed of around 1800 to 1900 running 550mm blades, so a motor rated at 850kv to 1100 kv is the best choice.
The thrusted tail grips aren't really necessary for lower head speeds IMO. I use the stock tail grips on my 550 with no problems, but I do use thrusted grips on my 425 running a head speed of around 2900.
Thanks for the positive comment about the site. We have a great bunch of guys here that are always willing to help out. Best of luck with your new Hurri.
Jerry
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Post by jasong911 on Feb 18, 2011 13:04:44 GMT -5
Thanks, Jerry. Nice to have a dedicated spot for some of these questions...
Actually, I have a newbie question:
I have a Gaui 610 100 amp ESC with 3 black motor wires. Does it matter which wire from the ESC goes to the 3 different colored motor wires?
--Jason
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Post by xodarap1 on Feb 18, 2011 19:38:23 GMT -5
Sorry to jump in Jason, but I wanted to get you a quick answer since i was here.
For the motor wires.. remember that if the motor spins backwards, just swap any two motor wires and all will be well.
Steve
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Post by jasong911 on Feb 19, 2011 1:08:15 GMT -5
Ok, then. Seems easy enough, now if I can just fit the slightly oversize (tinned) ESC wires into the bullet connectors that Scorpion gave me, I'll be set. I'll heat them up and see in the morning...
Thanks, Steve.
--Jason
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