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HelicopterThunder TigerOther › Raptor 50 SE headspeed problem
03-08-2006 07:18 AM  11 years agoPost 1
rnolen

rrNovice

Spokane, WA

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I took out my raptor 50 se sunday and was flying it around for about 5 minutes. Then it sounded like the rpms were higher, so i brought it in closer and was hovering it. The rpms kept getting faster and faster i had to put it down. It had to be over 2200 rpms... the head was starting to shake right before i put it down.

There was plenty of smoke comming out of the pipe, there was no lack of power and it held its elevation no problem. The headspeed just kept going up. It went from normal to extreamly fast within about 10 seconds. I put it down and checked out some stuff on the radio and the heli. The clutch bell was cool, the motor temped about 15 degrees warmer than normal. But i can understand that since it was spinning so fast. Plenty of smoke, almost seemed to rich...

Im pretty new to Heli's, i cant seem to figure this out. I took the motor out and the carb was on tight, the plate was good, the head was tight. The only thing that was out of the ordinary was the pipe gasket was blown out on the bottom and there had been fuel leaking out of it. Any help would be greatly appreciated, thanks

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03-08-2006 07:25 AM  11 years agoPost 2
rudy0308

rrApprentice

Williamsburg Va

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Do you have a governor that you are running on your Heli and have you checked all your fuel lines for any type of cracks or cuts.

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03-08-2006 09:19 AM  11 years agoPost 3
SkateFreak

rrElite Veteran

Cambs UK

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Hey.
You say the bottom of the seal between the engine and the "pipe"?
If you mean muffler, this would cause a loss in muffler pressure and thus a loss in the tank pressure reducing the amount of fuel pushed into the carb, causing the engine to lean out slightly...
This would lead me to belive that the gasket blew out, the engine then started to lean out and the head speed accelerated, upon noticing this you brought the heli down and landed before the engine temp had a chance to rise substantially.

Replace the seal and take her out again, i bet she'll run beautifully again

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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03-08-2006 04:06 PM  11 years agoPost 4
rnolen

rrNovice

Spokane, WA

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I checked the fuel lines going into the engine, but not the line going form the tank to the header tank, i will check them all tonight. No Govoner yet.

Thanks for the help, i will try that. Now that my gasket is gone. What should i use? Like some high temp atv gasket maker? Anyone have some sugestions for a good sealer between the muffler (pipe) and the engine. Thanks

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03-08-2006 04:21 PM  11 years agoPost 5
mr_shifta

rrNovice

UK

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use a very thin coating of 2 part epoxy for the seal, works a treat.

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03-08-2006 04:26 PM  11 years agoPost 6
SkateFreak

rrElite Veteran

Cambs UK

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Hey,
Now i know this will sound absoloutly mad but its worked for me every time
Supermarket recipt paper!
I Sware, Tesco recipt makes the best gasket's!
Fold over to required thickness, cut out, soak in a little fuel, clamp down and trim!
They do blacken after a gallon or so but seem to hold up for some reason

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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03-08-2006 07:44 PM  11 years agoPost 7
300wby

rrVeteran

Columbia City, Indiana

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Construction paper works for gaskets also.

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03-08-2006 08:12 PM  11 years agoPost 8
BarracudaHockey

rrMaster

Jacksonville FL

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Nix the stock tubing in the tanks and replace it with aerotrend medium or hayes clunk line.

Also you don't need a gasket if the surfaces are true just bolt it up metal to metal, fly it once and snug the bolts.

Andy
AMA 77227
http://www.jaxrc.com

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03-09-2006 03:15 AM  11 years agoPost 9
300wby

rrVeteran

Columbia City, Indiana

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barracudahockey

I actually think that way about the exhaust too, I used a file and trued the face of the muffler. Shoved a little paper towel in the in side and filed it flat. I use construction paper for the backplate gasket.

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03-09-2006 01:42 PM  11 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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I use glass and a piece of emory paper.

Different things expand at different rates. Its a given something is going to expand and contract and get loose.

Andy
AMA 77227
http://www.jaxrc.com

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03-09-2006 06:16 PM  11 years agoPost 11
kdog

rrNovice

Chicago

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DO NOT USE red RTV gasket maker! I used this before and it caused major engine problems if applied to liberally. I had to clean the engine exaust port from the excess gasket maker and buy a new muffler because the residue kept fouling glow plugs.

I now use Fel Pro exhaust gasket material from an auto parts store and cut to fit. Its about 1/16 thick with AL sandwiched between two layers of high temp material. It works the best!

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03-11-2006 04:31 AM  11 years agoPost 12
Joe Raptor

rrNovice

Conroe, Texas

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THERES A HOLE IN YOUR GAS TANK ON THE SIDE WHERE THE COGS THAT HOLD IT IN ARE. YOU HAVE TO GET A NEW TANK, JUST BE CAREFUL PUTTING IT IN, LOOSEN THE SREWS ENOUGH AND SPREAD OUT THE FRAM SO NOT TO DAMAGE THE NEW ONE.

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03-11-2006 01:18 PM  11 years agoPost 13
BarracudaHockey

rrMaster

Jacksonville FL

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A couple of things.

Typing in caps is considered yelling, notice the 4 things at the top under "Policy fo Post Reply"

The holes in the fuel tank problem can be solved when you build it by sanding the sharp edges on the frames. Also if the tank has a small hole from rubbing you can fix it with a soldering iron.

Andy
AMA 77227
http://www.jaxrc.com

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03-12-2006 02:12 AM  11 years agoPost 14
rnolen

rrNovice

Spokane, WA

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Update, i checked everything. I could not find a leak in the tank, the fuel tubing all checked out good. I filed down both surfaces smooth, bolted it together (no gasket) and she ran like a top. No leaks, no headspeed weirdness. Problem solved. Thanks you for all your ideas and suggestions, much appreciated.

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HelicopterThunder TigerOther › Raptor 50 SE headspeed problem
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