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LMH Helicopter Discussion of all LMH helicopters both electric and glow.

Motor RPM

Old 05-24-2007, 11:49 AM
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Lwing
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Default Motor RPM

Hi all,

i'm new there, ai just register today. 2 months ago i bought an LMH-120.

Now it is ready to Fly, But i think i got a lightly problem with the motor. In fact the heli hover without a lot of gaz, i would like to have more rpm to my rotor, before the heli can start to fly.

Does anybody could tell me more about the things that i have to do?

i fly with this configuration :

- 3 Nanos Multiplex
- Graupner Speed500 race
- Jeti advance 30A
- 2200 3s 15C Lipo

my pinion gear is a 9 tooth one.

thanx by advance for your answers and sorry for my english, i'm from france []
Old 05-24-2007, 10:31 PM
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Cambo
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Default RE: Motor RPM

Hi
Yep, lipos will do that.
Buy some smaller blade grips. The stock one comes with one 4 dot grip and one 6 dot grip. This measures out to 5 inches of pitch. Using two 4 dots will give 4 inches of pitch. Using a 2 dot and 4 dot will give you 3 inches of pitch. I recomend going with a 2 inch or 3 inch pitch setup. I hope this makes sence.

Remember, lowering the blade grips will increase the blade rpm (thus increasing stability) and reduce your climb out at power.
Old 05-24-2007, 11:19 PM
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Lwing
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Default RE: Motor RPM

thanx for your answer,

i order today blade grips of 2, i will see what happened.

Old 05-25-2007, 02:20 PM
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mestdaght
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Default RE: Motor RPM

The simple answer is your heli is too light. The heli is designed for SC cells, not for lipo's.
If you have the possibility too ad ( sinfull ) weight, like double your batteries it would be better.

An extra advantage of higher rpm, is a fast spinning tail. better with HH gyro's.

i fly 4&2 dot grips with 7GP3300 SC cells +-1350Gr auw.


TM
Greeting from Belgium

Old 05-25-2007, 02:37 PM
  #5  
Lwing
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Default RE: Motor RPM

Thanx for your answer,

my 120 gaves +- 1000g

you really think i have to put some more weight on it?

thanx by advance
Old 06-09-2007, 03:15 PM
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Lwing
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Default RE: Motor RPM

hi all i resolve my problem.

I put some more weight (1.2 kg instead of 0.980kg) with 2x2° grips.

now it flys good.

thanx for all for your help.
Old 06-11-2007, 11:40 PM
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Cambo
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Default RE: Motor RPM

I believe Matt from BT makes some 1 dot blade grips.
Old 06-12-2007, 10:20 AM
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Lwing
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Default RE: Motor RPM

think it wil works with this with some less weight, or with some more RPM.

it will also increase the stability of the corona.

may be i'll try one day
Old 06-12-2007, 01:39 PM
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notasme
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Default RE: Motor RPM

You could also try the shorter blades. I use the shorter blades. No added weight, higher rotor RPMs, less load on the motor. I am using the 2 dot blade grips.

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