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HelicopterEngines Plugs Mufflers FuelTT50 & TT39 Needle Mods
11-03-2003 09:58 AM  14 years agoPost 1
G.Man

rrProfessor

Bristol

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There have been a lot of questions regarding the above engines and mods to their idle needles..

Thanks to Reesy I now have some decent pictures I can post of a before and after TT50 and TT39 idle needle..

The TT50 needle was modded by Russ Deakin, The TT39 needle is one of Ressy's (I think)


TT50 Stock

TT50 Modded


TT39 Stock

TT39 Modded.

These needles achieve one fix for the TT50/TT39 and that is to allow a good mix at mid throttle etc without the need to run a slobbery rich idle that kills the engine before you manage to set it down to fly...

You can achieve similar results with a rich idle and leaving the glow stick on until you set the model down..

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11-05-2003 02:54 AM  14 years agoPost 2
drdot

rrElite Veteran

So. California,​Orange County.

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My two cents...

Galifrey, I've been posting to this forum about the needle mods, and am using a steeper taper than you show in the photos, affecting only about .045-.055 thousandths of the needle end. I would like to try your approach, and wonder if you can post approximate dimensions of the tapers you are using...

Thanks,

John.

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11-05-2003 07:10 AM  14 years agoPost 3
greatplanes

rrApprentice

boston, ma

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needle mod

i just got a TT 50. are there any people who can do this for a fee?
i don`t think i can, and don`t want t o screw it up, or is it capable of being done by any one with the proper tools

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11-05-2003 09:47 AM  14 years agoPost 4
G.Man

rrProfessor

Bristol

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DrDot

I have sadly posted my last spare needle to Reesy, so do not have one I can measure... without removing it from my heli and that is tough...

The needle is 0.8mm at the tip and is tapered back to approximately the original width at its original seating point...

Some others have also had success with a different longer concave taper (magoo for example) so it seems there is more than one way to skin a cat with this mod...

All this mod does is allow you to run a weaker idle with still a good mix all the way to the top end...

Stock they need a slobbery idle to achieve this..

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11-06-2003 12:38 AM  14 years agoPost 5
drdot

rrElite Veteran

So. California,​Orange County.

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Galifrey...

Sound like we're all getting to the same place by different routes..

I'm gonna play with another .39 needle based on your design just to see the difference, if any...

Thanks for the reply..

John.

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11-06-2003 11:42 AM  14 years agoPost 6
zoro

rrApprentice

Cairns

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Hi Guys,
This mod looks fine and i'll hafta try it. But what tools/equipment are ya's using to acheive the result? Do i need a lathe or a drill with a file and some sandpaper??

Kent Duncan

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11-06-2003 12:12 PM  14 years agoPost 7
G.Man

rrProfessor

Bristol

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Zoro

The tt50 needle above was done with a drill, needle file and emery cloth...

Not precision engineering I'll Grant you, but it shows what even a rough job can do compared to the original

If you search thru Mr_Magoos posts he has another style that uses more of the needle with a concave taper... he has also reported excellent results with that...

Don't know if he has published a pic of of his needle tho..

I have recently aquired 2 new 50 idle needles so would like to try these using other methods as well... just to see the difference...

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06-29-2004 11:05 PM  13 years agoPost 8
MPDano

rrVeteran

San Diego. CA

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Will this work with the TT 36 also??

Leo Dano

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06-29-2004 11:33 PM  13 years agoPost 9
Reesy

rrKey Veteran

In the doghouse ...​Nottingham UK

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Yes I did the TT39
nowt scientific...
just shoved it in a drill
seemed to work OK tho'

Sorry if I've offended the purists

Paul

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06-30-2004 12:28 AM  13 years agoPost 10
gwong

rrApprentice

Langley, British​Columbia, Canada

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On my TT39, here is how I did it,

Took the high speed needle out,

unscrewed the low speed needle as far as it can go.

used a piece of piano wire, I think it was .020" and slide it thru were the high speed needle opening and used it to push out the low speed needle.

Put a piece of fuel tubing around the oring and threads for protection,

Chucked it up in a drill

Used a needle file to get a nice taper so the point is about .8mm

Used a caliper to measure.

Polished it up with fine emery paper.

Took a few mins but the effort is well worth it.

Gord.

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06-30-2004 12:32 AM  13 years agoPost 11
MPDano

rrVeteran

San Diego. CA

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Anyone actually try this on the TT 36 though? Is it the same carb? Thanks

Leo Dano

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06-30-2004 09:01 AM  13 years agoPost 12
baby_zyklon

rrElite Veteran

Singapore

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the tt36 has a needle that is like the modded one, that is one with a sharp end...not sure about all the tt36 out there, but mine definately came with the needle that has a sharp end.

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