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HomeAircraftHelicopterMain Discussion › Thunder Tiger Pro 39H carb settings
05-26-2018 07:49 PM  24 days agoPost 1
gmcullan

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Southbridge, MA

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I've been returning to flight status a Hirobo Hughes 300 that is equipped with a TT Pro 39H. A prior owner has seriously messed with the carb settings. I know that three turns out on the main needle is a good place to start, but does anyone know what the factory setting was for the mid
range needle? The manual for the motor states that the mid range needle is factory set but with no mention of the actual setting.

Thanks for your help!

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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05-27-2018 02:31 AM  24 days agoPost 2
TMoore

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Cookeville, TN

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Run the LS needle as rich as you can as it controls the Idle and mid range. Tune the HS needle only on full power.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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05-27-2018 01:54 PM  24 days agoPost 3
gmcullan

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Southbridge, MA

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^^ Agreed. However, the prior owner of this heli for some unknown reason fully seated the LS needle. This is with a brand new, never run motor. I'm just trying to get an idea as to how far out the LS needle should be as a starting point.

I have this same motor in my Raptor 30 V2 and it is probably the best running nitro heli motor that I've ever had. I did make a one time adjustment to the LS needle on this heli of probably less that 1/8th a turn from the factory setting. This motor runs so well that I am loathe to turn in the LS needle to get a turn count, fearing that I will mess up the magic foo foo that allows this motor to run so well.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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05-27-2018 05:43 PM  23 days agoPost 4
TMoore

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Cookeville, TN

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Wing it.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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05-27-2018 07:58 PM  23 days agoPost 5
allns47

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Richmond IN.

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Four turns out from closed

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05-27-2018 08:39 PM  23 days agoPost 6
JuanRodriguez

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The Villages, Florida

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allns47
Four turns out from closed
Where did you find that documented ???

Been there, done that and old enough to know better.....

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05-27-2018 09:12 PM  23 days agoPost 7
gbeeu

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BC, Canada

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I googled the engine size and what do yah know I found this.

20125289444.pdf

Logo 690 SX, Logo 600, Titan 50SE Astar

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05-27-2018 10:15 PM  23 days agoPost 8
JuanRodriguez

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The Villages, Florida

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gbeeu
I googled the engine size and what do yah know I found this.
As did I.....

It doesn't give you any initial needle settings that I could find....

Been there, done that and old enough to know better.....

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05-27-2018 10:19 PM  23 days agoPost 9
allns47

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Richmond IN.

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I've ran a few of these and the low was 4 turns out factory setting is 3.5 turns out from close...mine always ended up about 4

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05-27-2018 11:36 PM  23 days agoPost 10
Jeff polisena

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westpalmbeachflorida usa

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Close carb barrel and then turn low in until it seats lightly then start at 4 turns out . Get motor to idle (setup) and when it stays idling pinch line and lean until when you pinch line motor will rise rpm slightly and die around 2 seconds . This will get you close until
You set high then pinch at idle again . After all this you can do finger on backplate or temp gun after flying .
Better on rich side to start .

I stole it ,flew it and gave it back ;)

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05-27-2018 11:38 PM  23 days agoPost 11
gmcullan

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Southbridge, MA

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Thank you for the four-turn recommendation. I also managed to google up the manual PDF and was quite surprised that it didn't include an initial setting for the LS needle other than "set at factory".

Many thanks to all for your help!

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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05-28-2018 12:00 AM  23 days agoPost 12
allns47

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Richmond IN.

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Anytime I would try to turn my ls needle in past 4 it would begin to lean out quick

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05-28-2018 04:08 PM  22 days agoPost 13
gmcullan

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Southbridge, MA

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Many thanks to all that responded. Four turns out from fully seating the LS needle did the trick.

Once again, all the expertise on RunRyder comes through with the solution!

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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05-29-2018 03:45 AM  22 days agoPost 14
Infarcted

rrApprentice

downunder

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With the pinch test , is there a certain distance to pinch the line from the carbie nipple?

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05-29-2018 10:30 AM  22 days agoPost 15
JuanRodriguez

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The Villages, Florida

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I’ve done it an inch or two from the carb nipple but I don’t think it really matters as what you’re doing is stopping the flow of fuel to the carb.....

Been there, done that and old enough to know better.....

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05-29-2018 01:30 PM  22 days agoPost 16
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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^ just behind carb nipple will work but as long as you stop fuel .

I stole it ,flew it and gave it back ;)

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05-29-2018 01:38 PM  22 days agoPost 17
Infarcted

rrApprentice

downunder

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Thanks for the advice about the pinch test .When I first learned of this 20 years ago ,I always thought if you say had 3 inches of fuel line just before the carb nipple and squeezed it there , then it would take forever for that column of fuel to be used up. Pehaps I was wrong all along. Thanks again .

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05-29-2018 02:17 PM  22 days agoPost 18
JuanRodriguez

rrProfessor

The Villages, Florida

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Infarcted
Thanks for the advice about the pinch test .When I first learned of this 20 years ago ,I always thought if you say had 3 inches of fuel line just before the carb nipple and squeezed it there , then it would take forever for that column of fuel to be used up. Pehaps I was wrong all along. Thanks again .
When you pinch or clamp the fuel line shut, the remaining fuel that's left between the clamp and carb SHOULD NOT move !! That's because you've created a vacuum and the fuel can't flow. If you see fuel moving after you pinch it that means you're not really shutting off the fuel flow effectively.....

The reason the motor continues to run for a few seconds after the fuel line is clamped is because the motor is burning the fuel that is left in the crankcase.....the amount of time in seconds that the motor runs will give you an indication whether the idle mixture is too rich or too lean.....

Been there, done that and old enough to know better.....

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05-29-2018 08:57 PM  21 days agoPost 19
Infarcted

rrApprentice

downunder

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Thanks Juan ,
That REALLY clears it. I'm so thick.

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