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HomeAircraftHelicopterThunder TigerRAPTOR 50 › Raptor 50 Titan SE with Redline TT Pro setup
01-24-2010 10:33 AM  8 years agoPost 1
etchasketch

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New Zealand

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Hello,

I recently built my first rc helicopter:

Raptor 50 Titan SE
Redline Pro 53H engine
Redline Hi-flow 3D pipe

I am having trouble finding the best setup for the engine.

I have the low needle flush with the carburetor case.
The high needle is very rich producing lots of smoke at hover with a headspeed around 1800rpm.

However, there is a hole in the power as i bring up the collective stick:

5%-49%: engine seems to power up fine
50%-65%: engine loses power a lot (not enough to engage the clutch sometimes)
65%+: engine has lots of power

The throttle curve is linear from %5 throttle at no stick to 80% throttle at full stick.

I started out with a much lower curve of %5 up to %40, and later found out i was just playing in the lower throttle levels and not hitting the power hole, but at the same time was unable to get stable head speeds at hover.

Can someone please give me advice on how to set up this engine? Should I be messing with the low needle if i'm getting such an obvious change when trying to smoothly increase the collective?

Thanks for your help.

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01-24-2010 11:41 AM  8 years agoPost 2
Billebob

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Tim-buck-2

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50%-65%: engine loses power a lot (not enough to engage the clutch sometimes)
Are you at operating rpm when this happens or is it a spool up thing? It could be your curves, maybe you need to pop it up to around 1900-2000 rpm. Open your throttle fully at top collective stick, you want the real power hole Adjust pitch curve ends as necessary to get a stable rpm.

If it is a transistion thing only happening at spool up but fine in flight I'd leave it be or maybe adjust the low speed dependant on the idle performance.

Does it idle fine?

Does the smoke trail get thicker or thinner at this unwanted issue point provided it occurs in flight? It may simply be too rich on the high speed.

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01-24-2010 09:32 PM  8 years agoPost 3
mylee

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Rochester, UK

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The high needle is very rich
think you've answered your own question here

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01-25-2010 12:39 AM  8 years agoPost 4
NitroAl

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Gold Coast Aus

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think you've answered your own question here
mylee has hit the nail on the head! The mid range is very rich when the high speed needle is rich causing that hole at around mid stick.
I go four or five clicks leaner than the factory setting and live with the hole until the engine has 3 or 4 flights on it and then start leaning it out to a good tune!

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01-26-2010 09:54 PM  8 years agoPost 5
etchasketch

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New Zealand

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Are you at operating rpm when this happens or is it a spool up thing?
The rpms seems to be similar below and above the hole. I need to get over the hole to get to a hoverable pitch. So i guess you could call it a spool up thing.
Does it idle fine?
Yes, it gurgles a bit when idling, but hasnt cut out on me yet.
Does the smoke trail get thicker or thinner at this unwanted issue point provided it occurs in flight?
The smoke appears to get thinner, suggesting it's leaning out, but the loss in power suggests its bogging down. It does not occur in flight.
mylee has hit the nail on the head! The mid range is very rich when the high speed needle is rich causing that hole at around mid stick.
I go four or five clicks leaner than the factory setting and live with the hole until the engine has 3 or 4 flights on it and then start leaning it out to a good tune!
Thanks mylee and NitroAI. I agree that the mix is very rich right now, and I will get a few more tanks through it and start leaning it up.

I have also realised that I've toned down the pitch on the collective a lot in case the heli got away from me when first starting it up. This will have affected the throttle position at hover, and i might have made things more complicated than they need be. Now that I know it's not going to explode I'll put the pitch curve to something a bit more reasonable.

Cheers

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