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HelicopterThunder TigerOther › TT50 low needle mod
12-12-2004 12:41 PM  13 years agoPost 1
SPB

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Athens - Greece

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Today I made the low needle mod in my TT50. The engine was running good w/out the mod but I had a new spare needle so I made the mod and I replaced the stock one.

What is a good start point for the needles after the mod?


Sotiris
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12-12-2004 01:47 PM  13 years agoPost 2
dankers

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Melbourne, Australia

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I also made the low needle mod today - 4T on low and 3T on high is where I started and tune from there. Maybe a silly question but if the engine was running good why did you do it?

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12-12-2004 02:19 PM  13 years agoPost 3
SC Raptorman

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South Carolina

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Low needle mod

When you adjust the low end needle , adj so the enginge runs real smooth then back it alittle and adjust high to 2 3/4 to 3 turns and enjoy the running and slipping less fuel and smooth power . I did mine and I love it .

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12-12-2004 02:30 PM  13 years agoPost 4
SPB

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enjoy the running and slipping less fuel and smooth power
Dankers this is why. When I say I didn't have problems I mean with high temperatures. The engine was giving power but not a smooth nice power. The idle at the fisrt start of the day was always a little inconsistent and I always running the engine rich (thanks to Al Magaloff for the spelling correction) at the low to have a good mid range.

I left the stock needle with the two orings intact so if I will not be happy with the mod anytime I can put it back. The needle I made the mod was the old one with the one oring and it was purchased excatly for this reason to be modified.

I made a quick test in my yard with 3 turns in both needles. The engine was running very rich spitting unburned fuel from the exhaust so I think 4 in the low and 3 in the high is to much for me now. I'll try leaning the low as SC Raptorman said to a smooth idle and then I'll make some climb outs for the high. I hope I will have some good results.

Thanks for the info anyway.


Sotiris
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12-12-2004 03:08 PM  13 years agoPost 5
Al Magaloff

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Sotiris, hover, then land and come back to idle. Get the idle as rich as it will tolerate. Then work on the high. Don't lean the low too far. When it's right, the motor will just stay running with the glo driver removed. Back cover will be warm only, not hot.

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12-12-2004 03:57 PM  13 years agoPost 6
dankers

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Get the idle as rich as it will tolerate. Then work on the high.
This is how mine was set and ran sort of ok, just like SPB the low had to be just about able to idle for the mid range to be rich enough. If I got the idle smooth and the high end nice and powerful but still rich, the mid range was way too lean. Did the needle mod as a bit of an experiment and learning experience, could go back to how it was and be fairly happy though.

I have some head loaders strapped on and will spend a few hours getting it tunned tomorrow.

4 and 3 was where I started, down to 3 low and 2 3/4 and just like yours am spiting fuel at idle - sounds like our engines are a like. Only did 10 minutes of testing as it got late.

I was orginally at 6 turns out on the low end and the idle at 3 turns with the needle mod feels the same. So if I did the needle mod right, should be able to get the idle better and the mid range should be ok as well.

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12-12-2004 04:01 PM  13 years agoPost 7
Al Magaloff

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Dave, I'm talking here about tuning after the mod.

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12-12-2004 04:05 PM  13 years agoPost 8
dankers

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Melbourne, Australia

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ah ok, sorry. that's how it used to run so I don't know if it's going to be any better with the mod then.

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12-12-2004 06:30 PM  13 years agoPost 9
SPB

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Athens - Greece

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First of all many thanks to Al for the spelling correction. English is not my mother language so many times there might be spelling errors in my threads.

Dave I had more or less the same settings with you before the mod. 6 1/4 the low and 2 3/4 the high with Enya #3, stock muffler and CP15%.

I am planning to go flying on Tuesday so I'll try what Al told me above and keep you posted. If you will try yours ealrier it would be much appreciatted if you will also let us know how it went.


Sotiris
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12-13-2004 01:31 AM  13 years agoPost 10
Ace Hobby

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California

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Engine Setting

On my Raptor 50 with TT 50 engine the low is set at 3.75~4 and the high is set to 3.5 turns. This runs smooth and provide goods results on powermaster 30% nitro. Tappering the low speed need will make your bottom end more sensitive. The stock needle works fine on both the single o-ring and the double o-ring. Leaning the bottom end to far only causes banging when transitioning through zero pitch and can cause your ring to snap if not dealt with quickly. A little richer on the bottom end will enable you to lean the top end while keeping your mid from going lean.

Keep on flying!

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12-13-2004 05:42 PM  13 years agoPost 11
Al Magaloff

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SPB, your spelling is just fine, and your English is quite a bit better than my best Greek!

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12-14-2004 10:05 AM  13 years agoPost 12
dankers

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Melbourne, Australia

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Just a follow up. Ended up taking more of the needle, on advice from Al, now 0.7mm.

Low end is a lot leaner now at 2 turns out and the top end is at 2.5 - smooth all through the rev range, no more spitting fuel but nice and smokey, temp is perfect also, just warm.

However, this was tested for only two tanks with head loaders on as the weather was a bit average today. Will have a fly tomorrow if the weather is ok, so far so good. It does make the low end needle extremely sensative and headloaders were great for tunning as its easy to make changes while the motor is running. It seems to be running ok, the main reason I did this was that I was getting tail kicks at hover. Hopefully they are fixed now, if not I'll be posting a video as they are really annoying me.

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12-14-2004 10:09 AM  13 years agoPost 13
Al Magaloff

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Keep at it Dave, you're on top of it now! The low needle needs to be moved in screwdriver blade width increments, much different than before the mod, where quarter to half turns had little to no effect.

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12-15-2004 11:54 AM  13 years agoPost 14
dankers

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Melbourne, Australia

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The mod is actually fairly good - got the engine dialed in today. Found my main issue though, the head was not tight enough and this was showing once the engine got hot. Heard from one of the cluey club members that running them lean (which happened in the past) makes all the bolts lose - this explains why the glow plug fell out yesterday as well.

So one nice Raptor engine - nice idle, loads of power and smooth.

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HelicopterThunder TigerOther › TT50 low needle mod
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