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HomeAircraftHelicopterThunder TigerOther › How to increase RPM
12-10-2004 01:35 PM  13 years agoPost 1
Dragonfryer

rrApprentice

Singapore

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Hello,

I am back to running 15% nitro on my TT39 but the rpm at idle seems too low.

It takes more than 3/4 stick to hover.

How can I increase RPM without over leaning therfore overheating?
I did re-do the TX throttle set up but dont seem 2 help.

Thanks

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12-10-2004 01:39 PM  13 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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Adjust the blade pitch a little less to bring up the RPM's.

Take Care,
Cheers, Patrick

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12-10-2004 01:54 PM  13 years agoPost 3
Dragonfryer

rrApprentice

Singapore

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Main Blade Pitch
The present setting is 0,5, 9

What is the minimum I can reduce the pitch to?

Thanks

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12-10-2004 01:58 PM  13 years agoPost 4
Saint728

rrProfessor

Honolulu, Hawaii

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Hmmm, you might have to try something else if your blade pitch is that? I would either try to lean it out a bit or go up in nitro content? What type of fuel are you using now?

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
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12-10-2004 02:01 PM  13 years agoPost 5
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
isn't there a way to increase the throttle with your curves...maybe go n raptortechinque and start all over again...and reset them....i thought that was how you do it....not increase nitro content
because obviously the headspeed is increasing idle up 2 isn't it....so it's capable


Let me know

Thanks
~Will~

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12-10-2004 02:05 PM  13 years agoPost 6
Dragonfryer

rrApprentice

Singapore

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Gearing Ratio with TT39 on R30V2
Hello

I am burning 15% coolpower.

Is changing the gearing ratio to change the main rotor RPM desirable?

Presently, I have the stock main & pinion gear giving a ratio of 1:9.56, but my rotor RPM is too low at idle.

Which gear ratio should be optimum to keep the present pitch setting at 0,5,9?

Thanks

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12-10-2004 02:09 PM  13 years agoPost 7
Ringding

rrApprentice

Austria

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What does the gear ratio have to do with the throttle at idle? Do you know what a throttle curve is?

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12-10-2004 02:11 PM  13 years agoPost 8
Saint728

rrProfessor

Honolulu, Hawaii

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I would redo your pitch and throttle curves. I didn't even think of that before Will (nojohnny101) mentioned it. I thought you already tried that method so I was trying to think of something else it could be? Try that way first and see how it goes.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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12-10-2004 02:19 PM  13 years agoPost 9
Dragonfryer

rrApprentice

Singapore

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I guess the consensus is to adjust the throttle curve.

Thanks to all

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12-10-2004 04:33 PM  13 years agoPost 10
spaceman spiff

rrKey Veteran

Tucson

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you might need to adjust your idle needle to compensate for the lower nitro. (idle needle covers power all the way up to half throttle on that engine)

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12-10-2004 05:07 PM  13 years agoPost 11
Drunk Monk

rrProfessor

Preston, UK

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Have a look at http://www.raptortechnique.com about setting up the heli. You don't have to change any hardware, it's all in the radio.


Stephen

I only open my mouth to change feet.....

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12-11-2004 12:26 AM  13 years agoPost 12
3d type

rrVeteran

Bridgeport,CT USA

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what nitro % were u using before?

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12-11-2004 01:56 AM  13 years agoPost 13
Dragonfryer

rrApprentice

Singapore

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Hello,

I was running 30% nitro before, the rpm was so low that I hover at more than 3/4 stick.

I have to re-do the TX throttle curve .

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12-11-2004 03:34 AM  13 years agoPost 14
Cherokeepilot

rrNovice

Charlotte NC

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Dragonfryer

Sounds like a mechanical problem
I would recommend this:

1. Verify that your carb opening is open enough on the engine when your collective stick is all the way low.
2. On your radio, go to throttle curve and your lowest percentage setting should be around 15-25%. Then still make sure carb on motor is still cracked open enough for a higher idle.
3. Perhaps adjust low end needle after trying first two steps

Remember if you are wanting to hover at 1/2 stick:

a. your carb barrel on the engine is 50% open and trim centered
b. collective stick at hover position
c. throttle curve dialed to 50%

Hope this helps, after all this I also switched to 30% CP and my TT39 runs much better and transitions easier.

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12-11-2004 04:28 AM  13 years agoPost 15
l-milk

rrApprentice

georgia

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just change your throttle curves. raptor technique gives you his for example. like he says. like if your middle curve is 60 go and make 10 difference on each side of 60. so it would be 0 50 60 70 100 on a five point curve . just as long as they are 10 point difference on each side of your middle number. more head speed would require you using a higher curve setting. thus giving you 1/2 stick hover.

just fly

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