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HomeAircraftHelicopterThunder TigerOther › TT39 Low Needle Setting
05-07-2005 06:05 PM  13 years agoPost 1
Dragonfryer

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Singapore

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Hello,

On the TT39 motor, how many turns should the low needle (mixyure mixing) be turned out with the throttle fully closed?

3 turns out for the hi-needle?

Please advise. Thanks

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05-07-2005 07:04 PM  13 years agoPost 2
Raptor_in_Swede

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Stockholm /Sweden

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The low-end needle should be 2,5-3,0 turns open, when the throttle is closed to mechanical stop.
The main(high) needle should also be 2,5 -3,0 turns open.
Using 12% Nitro and a muffler with low-backpressure I have the main open 2,6 turns and the low-end 2,8 turns (wich is on the rich side).

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000

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05-08-2005 06:22 PM  13 years agoPost 3
drdot

rrElite Veteran

So. California, Orange County.

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my two cents...
This is hard to quantify..Best bet is to set the low needle to as rich a condition as you can and still keep the engine running..
This is necessary as the idle needle controls the midrange...Most people set the needle much too lean...

John.

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05-08-2005 06:29 PM  13 years agoPost 4
Dragonfryer

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Singapore

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TT39 Tuning
Hello DrDot,

Please elaborate. I did try to turn the low needle out about 4 turns before. The hi needle about 3 turns out, but headspeed still too low.

The engine bogs down when the throttle stick was advanced beyong half way.

Please advise.
Thanks

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05-08-2005 06:39 PM  13 years agoPost 5
Raptor_in_Swede

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Stockholm /Sweden

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3 turns out on the hi needle is probably too rich, thats why the engine bogs down at half stick. Close it in 1/8 turn steps until it´s not bogging down at half stick.

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000

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05-08-2005 06:52 PM  13 years agoPost 6
Ringding

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Austria

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Yeah, and 2-3 on the low needle is usually too lean. It's more like 4-5 or even more. Don't expect a nice idle with the stock carburator.

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05-08-2005 08:19 PM  13 years agoPost 7
Dragonfryer

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Singapore

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TT39 Tuning
Hello,

So what is the low needle setting?
4-5 turns out does not engage the clutch?

But leaning the hi-needle didnt increase the RPM enough.

Pls help
Thanks

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05-08-2005 09:06 PM  13 years agoPost 8
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Do you have the throttle open 50% at 0* pitch?

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05-09-2005 01:46 AM  13 years agoPost 9
Dragonfryer

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Singapore

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TT39 Tuning
Hello Al,

I had set the trottle curve as: 20, 40, 60, 80, 100

The pitch curve is 5* at 60% throttle. It is 0, 15, 30, 50, 50

Thanks

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05-09-2005 08:59 AM  13 years agoPost 10
HobbyHomee

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Beale AFB California

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I have my high needle 2 3/4 out and my low is 4 turns out and with these settings seems to be about the best I can get it to run. Ive tried everything to get more power out of it and it still runs pretty hot with these settings. I can go a couple more clicks leaner on the high side but the temp just keeps going up. My nexus had more power than what I can get out of this one. Im pretty much done trying and am going to convert it to a 50 here soon.

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05-09-2005 09:59 AM  13 years agoPost 11
Al Magaloff

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Try the needle mod. If you are running as rich as you can, and still hot, the needle mod is for you. If you convert to a TT50, you'll be in the same spot, only with a larger motor.

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05-09-2005 02:24 PM  13 years agoPost 12
dtm360

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HKG

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Are the needle settings still the same after the needle mod? Thks.

I'm having the same problem with the slow speed blubbering rich after the low speed needle mod. I started the taper 4mm in, tapering to 0.8mm dia (ish). When I have the LSN at 3 turns out, the engine simply does not want to hold idle unless I have the throttle opened around 1/4!! At which point the exhaust is pouring out raw fuel...the same pink 30% Coolpower that I pour into the tank!

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05-09-2005 05:41 PM  13 years agoPost 13
Raptor_in_Swede

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Stockholm /Sweden

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When you do the LS needle mod, you need to close the LS needle compared to the initial seettings. When I did it on the TT50 LS needle I had to close the LS needle from 5 turns open to something around 3,5 turns open. What you accomplish with the needle mod, is that it reduces the LS needles influence on air/fuel mixture above 1/3 throttle.

Raptor 30V1/TT39H/Hatori#415/GY401_9253
Hirobo GPH GT/TT50H/Hatori #544/GY401_9254
RD8000

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05-10-2005 03:24 AM  13 years agoPost 14
drdot

rrElite Veteran

So. California, Orange County.

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Hi, dragonfryer..

Sounds like an issue with throttle/pitch curves..Are you running 30% fuel?

JOhn.

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05-10-2005 09:31 AM  13 years agoPost 15
HobbyHomee

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Beale AFB California

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"If you convert to a TT50, you'll be in the same spot, only with a larger motor"

Except that its a whole differant motor (OS over TT for sure) and setup. My evo50 has NO power problems or overheating problems. In fact Ive had zero problems with it at all. I love it. I wish I could change my raptor to an evo. Ive even been thinking of selling the raptor and getting another evo.

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05-10-2005 09:36 AM  13 years agoPost 16
Mattiward

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160ft off the deck 10ft from 400,000 volts - U.K.

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clutch engagement
Hi can i just ask -

I finished rebuilding my Rappy 30 TT39 with zimmerman pipe and 10% wildcat. and i noticed when i started it for the 1st time the head was wanting to spin up. i've not adjusted the engine but i did give the clutch and liner a good clean out with meths. its as though the clutch is engaging instantly however the revs seem to be normal??

any ideas or help?

Cheers Matt.

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05-10-2005 10:08 AM  13 years agoPost 17
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Is the clutch or liner new?

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05-10-2005 10:11 AM  13 years agoPost 18
HobbyHomee

rrNovice

Beale AFB California

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Its possible that the clutch may already be in contact with the clutch liner. Do this test- turn the head/blades and look and see if the motor/fan is turning. If it is than the clutch is contacting the liner. If its not than it may be really close (is it a new clutch liner ?) and just the engine idle speed can be enough for the clutch to engage the liner. Or your idle may be too high. I put a new clutch liner in my evo and literally had to start it with the idle set real high and rev the engine real high for a few minutes to wear in the clutch so it would not contact the liner at idle speed. Its still tight now. I barely rev up the engine and it grabs. I like it that way. Lets me no I have plenty of clutch left. Overall I dont think you have a big problem to worry about though.

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05-10-2005 10:11 AM  13 years agoPost 19
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Dragon, go back and read my post that asks, " Do you have 50% throttle at 0* pitch? "

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05-10-2005 10:15 AM  13 years agoPost 20
Mattiward

rrApprentice

160ft off the deck 10ft from 400,000 volts - U.K.

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no its still the original clutch & liner. i was going to put a new liner in but decided there was enough of the original left.

Matti

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