RunRyder - Plug reading

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Gasser Model RC Helicopters > Plug reading

jschenck
Elite Veteran
Location: La Vista, NE.

I put tanks two trough five through my Predator today. Flew great. I started off with both needles at about 1.5 out, after tank three was done I turned the LS in about a screw driver width. The heli seems to be running pretty smooth. I can't beleive how little fuel I've used so far. It was easily over an hour in the air but I've used about 1/3 gallon. My last flight was about 20 minutes with 1/5 tank still left. The muffler is getting quite a bit of black oil residue splatter on the back and I can see light oil smoke in the exhaust. My temp measurements were max 170F right around the exaust port.

Headspeed is low, I'm guessing 1300-1350. I did some light aerobatics, loops, rolls a few auto's never really pushed the machine or engine. My throttle curve is quite flat right now, I don't get above 30% until near full throttle. Never felt like it was working hard except a few climbs, even then not a hard grunt just chugging up hill a bit. There is not a lot of power/punch at full throttle, still too rich for that.

Anyhow I wanted to get everyone's opinion on my plug now. The black stuff around the edge flaked right off. The side electrode looks to have a bit of a black shine to it. Do I need to lean this out a bit before I stick the piston ring?

BTW - auto's are cool, better than I though it would be with the light RT710SG-3D blades. The gear noise is pronounced, makes it sound like a turbine coming in!

...yep...

04-20-2008 05:31 AM

FCM
Elite Veteran
Location: Back in Blighty!

What oil and mix are you using? The centre electrode looks hot and dry and the outer looks clogged up with oil residue. What engine RPM is 1300 rotor rpm?

My guess is that you are overloading the engine a bit as the carbi adjustments sound good.

Paul.

04-20-2008 07:30 AM

jschenck
Elite Veteran
Location: La Vista, NE.

4oz. of Lawnboy ashless to ~128oz of 87 octane pump gas.

Gear ratio is 6.28 so engine would be running somwhere between 8000 and 8500 RPM.

I really don't think the engine is getting hot at all but perhaps I do need to speed things up a bit since I'm out of the power band ??

Really lovin' the gasser

...yep...

04-20-2008 06:41 PM

xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

What engine?? 231 or 260, the 231 will like a higher rpm, the 260 likes around 10500rpm,,,

Yes way to low of a head speed,, you should be 1650, to 1700 for around 10,500 rpm on the engine,, this will bring your heli to life, for aerobatics,, Now if you wanted to, you could go to around 1550 for just hovering and easy ff, but I would bring the head speed up to around 1650 if I were you,, IMHO,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com

04-20-2008 07:08 PM

HOMEPAGE

jschenck
Elite Veteran
Location: La Vista, NE.

Hanson G260PUH - the Hanson that Century sells

...yep...

04-20-2008 10:04 PM

AceBird
Elite Veteran
Location: Utica, NY USA

Quote
Headspeed is low, I'm guessing 1300-1350.

Why??

Get it up at least 1500-1600 or stop guessing...

Ace
What could be more fun?

04-21-2008 12:49 AM

jschenck
Elite Veteran
Location: La Vista, NE.

I do need to get someone out with me to tach the HS. I suppose I was leaving the HS low with the intention of taking it easy on the heli. Probably would be better to step it up and get the fan spinning.

...yep...

04-21-2008 12:59 AM

FCM
Elite Veteran
Location: Back in Blighty!

Yes, get the speed up and don't guess - get it tached. You should find the engine and heli will be fine after this. Leave the needles as they are, run it for a good two tanks, mixed hovering forward flight and then pull the plug and see.

Paul.

04-21-2008 01:52 AM

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Gasser Model RC Helicopters > Plug reading

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