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Home✈️Aircraft🚁HelicopterThunder TigerOther › Beginner to Nitro Helis, Lots of Questions
09-09-2006 01:18 PM  14 years ago
BarracudaHockey

rrMaster

Jacksonville FL

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IR guns are neat and all but you will get a wide range of advice as to where to point it and what to look for.

Stick your finger on the backplate, it should be warm but not too hot to hold it there for 3 or 4 seconds, if its hotter than that its too lean, if its cool your running too rich and not breaking in your motor. As the motor breaks in you will have to lean it slighly to keep the backplate warm, this means the parts are seating nicely as the friction is decreasing. At some point it will stablize, that when your engine is broken in.
Andy
AMA 77227
http://www.jaxrc.com
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09-11-2006 07:44 AM  14 years ago
Farrell

rrApprentice

Huntington Beach, CA

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today i found a movie of a nitro heli that crashed and stuck WOT.

man that scares the crap out of me. what are the odds of getting stuck WOT? on a related topic, is it possible to run a throttle-return spring to help protect against lossing servo power in flight, like many rc cars run?

i was also looking into servos today. i would like to stick with hitec. im thinking of the 525-MG for all but the tail, and 925-MG for the tail. i'm trying to keep cost low, yet get decent servos that i won't have to toss in the "old parts bin" later on.

in my 400 size electrics i have yet to strip a servo gear, and i have had several boom strikes and tip overs. is it common to strip gears in a 50 size nitro heli? the servos i was looking at were metal gear, so i think they should hold up decently, correct?

lastly... rx pack: 4.8V or 6V? since it looks like the 525MG and 925MG can both handle 6V, and im going to use my futaba GY401 gyro which i beleive can handle 6V, i assume the best option is to use 6V?

thanks,
--farrell f.
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09-11-2006 03:19 PM  14 years ago
jschenck

rrProfessor

La Vista, NE.

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IMO, your best $30 servos for the heli:

3 x Hitec HS635 for the head
2 x Hitec HS525 for the throttle and tail.

I don't run metal gears in the 525's as they would not be needed and would quickly develop slop on the tail.

having said that, you'd be better off spending a bit more money and getting the 401/9254 gyro/servo or the JR500T/810G gyro/servo combo. Both of these serve me well - with this setup doing tail slides and backwards flight.


One way to minimize WOT on a crash to to run a pull/pull setup on the throttle. Also, make sure the ball links are not loose and ready to pop off. Of course this will not help if the electrics are damaged on the crash and you have no radio control! Some have experimented with light return springs similar to some R/C car setups but most do not do this because of the extra drain that will cause on the throttle servo.

best bet is if you *know* you are going in, hit the TH HOLD before the heli experiences ground interference. What ever you do hit it as soon as possible after you crash. It is weird to walk up to a mangled, twisted wreck with the engine idling happily away. SOUNDS like it could just throttle up and fly away.
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09-12-2006 02:21 AM  14 years ago
Farrell

rrApprentice

Huntington Beach, CA

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ok, and just for future reference, in the event i crash my 50 and the engine is still runing, or worse yet running WOT, whats the best way to stall the engine? granted if it's WOT, dont walk up until the main rotor isn't gonna kill ya, but after the clutch dies, etc.

stick your finger over the exhaust on the muffler?

thanks,
farrell f.
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09-12-2006 02:36 AM  14 years ago
jschenck

rrProfessor

La Vista, NE.

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pull the fuel line off! Works for hot-starts also ( ask me how I know )

Also, I've heard some people will throw a towel/blanket/shirt off their back on a thrashing heli to quiesce the rotors.
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09-12-2006 05:07 AM  14 years ago
averen

rrVeteran

Austin, TX

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ok, and just for future reference, in the event i crash my 50 and the engine is still runing, or worse yet running WOT, whats the best way to stall the engine? granted if it's WOT, dont walk up until the main rotor isn't gonna kill ya, but after the clutch dies, etc.
Might I also suggest a return spring on the throttle if you loose battery...here's how I know!

http://www.runryder.com/t274565p1/?...+heck+out+of+me

Jared
Knowledge is Power, Power Corrupts, Study Hard...Be EVIL!
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09-12-2006 06:25 AM  14 years ago
Farrell

rrApprentice

Huntington Beach, CA

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ya i have been reading about the occasional cell failure causing serious problems in nitro helis. i was contemplating taking an 8 cell 1100mAh NiMH pack i have laying around, and making two 4 cell packs to wire in parallel for my RX pack. this way i have a little bit of cheap insurance. assuming i only use one digital servo, for the tail, how long should my 2200mAh pack be expected to last on a full charge? three flights?

as for throttle return spring... i DEFINITLY want to get one, even it it means buying a new throttle servo on a monthly basis. the engine i will be running is an "OS Max .50 SX-H Heli Engine w/Hyper Cooling Head & 60LH Carb", and i don't know what to look into for the throttle return spring. i assume the carb is of the barrel type, but i dont know of a brand or part number for any barrel carb return springs. do you just get a standard spring and attach one end to a hole in the carb arm and the other end screw into some part of the heli's frame, trying to put minimal strain on the servo, yet still slightly over-power it when no power is applied?

thanks,
--farrell f.
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09-12-2006 07:22 AM  14 years ago
firefox

rrApprentice

Thailand

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I use a dual-lipo redundant setup on mine, so I already have insurance (and 4400mAh of capacity). Using two packs in parallel is OK, as long as the packs are the same (capacity, charge, voltage), but you need to charge them separately. With NiMh packs, parallel packs is recommended, since it'll help deal with the lower current and higher internal resistance. With only the tail servo being digital, you'll use around 300-400mA/flight, which means about 6 flights on a 2200mA charge.
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