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Gasser Model RC Helicopters > My first gasser
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

I picked up a used Predator gasser a little while ago and I am finally ready to get going with it. This is my first gasser rig and I have a couple questions.

It is powered by a Hanson G26. What octane of fuel should I run? What oil should I use? What ratio on the fuel oil mix?

It is a standard P-max gasser. I am not sure what the gear ratio is but what head speed should I be looking at for mild 3D?

Thanks.

Lou

Bowstrings, Banjo's, and Birkenstocks.
06-20-2008 10:25 PM
 
 
ccm15
Senior Heliman
Location: Lake Ariel, PA

Lou, I would break the engine in with a Lawn Boy oil mixed at 32/1 that is 4ox oil to 1 gallon 87 octane fuel. After the gallon is used up then you can go to a good synthetic such as Amsoil Saber or Klotz. There are many opinions to break in procedures but this works very well. That should be an awesome running engine you have there.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.
06-20-2008 10:49 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

If it is used then you might not have to use the lawnboy for break in again,,, Do you know how much fuel was ran thru it??

I use Amsoil Saber 100:1 mixed at 2.5oz. per gallon,, about 50:1

Yep,, 87 oct gas works great.... XGM/VGM

I think the P-gasser is 6.28:1 at that ratio,, you will need to be around 1950 to 2000 for the engine to be in it's zone..
1950= 12,246
2000= 12,560

But there are others running around 1800 with no problems...

The Hanson 260 Pro Plus likes 12,500 to 13,400 rpm on the engine, for Max HP and Torque, You might have to change the gear ratio to get the engine up to speed,,, Or run a lower HS!!! Hope this helps.. XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-20-2008 11:51 PM
HOMEPAGE  
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

harm

What is the potencial harm in running more than 2 gallons of Lawnboy?I bought a machine used But had no idea of how much run time was on it.So I ran 3 gallons of Lawn boy.Should I switch after this gallon?
06-21-2008 06:00 AM
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

Umm... So what is lawnboy?

Lou

Bowstrings, Banjo's, and Birkenstocks.
06-21-2008 06:08 AM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Lawnboy Ashless is a break in oil, (mineral oil) it will carbon up quickly, if you have 2 gallon thru it, I would change, I just helped a guy that had ran 3 gallon of lawnboy and the ring was stuck and all carboned up, he had to take it apart, and clean the ring grove in the piston,

I only run ONE gallon of lawnboy at 3oz. per gallon for break in, then switch over to Amsoil..

John Crotts
www.soonerhelicamproductions.com
06-21-2008 06:19 AM
HOMEPAGE  
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

Good enough for me.I'll finish this gallon off and switch to something synthetic
06-21-2008 06:31 AM
 
 
ccm15
Senior Heliman
Location: Lake Ariel, PA

I agree use only one gallon. Lawn-Boy is a really dirty oil.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.
06-21-2008 11:50 AM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Here are some pic's of a engine that has 3 gallons of Lawnboy ashless ran thru it,,




As you can see there is blow by, and the ring is stuck,, Hope this helps.. XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-21-2008 04:24 PM
HOMEPAGE  
 
 
pgkevet
Veteran
Location: surrey UK

...So why do they call it ashless?

pgk
06-21-2008 04:27 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Because they can!!!

Sorry I couldn't resist,,, I'm not for sure, I think it has to do with the chemical composite of the oil... Sorry pgk, but I really don't know... XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-21-2008 05:32 PM
HOMEPAGE  
 
 
pgkevet
Veteran
Location: surrey UK

Quote 
Sorry I couldn't resist,,, I'm not for sure, I think it has to do with the chemical composite of the oil... Sorry pgk, but I really don't know...

I was being facetious too.. ashless as in low residue of other minerals etc but the nature of burning petrol, gas, oil etc - assorted chain hydrocarbons.. you get unburnt carbon if combustion ain't right. There's always someone adding stuff to oils (and petrol) to improve adhesions, modify denaturing temps and the like.

It'd be nice if someone could give a scientific explanation (apart from we know it works) for why mineral oil for running in? It might even be the extra carbon you want as a lubricant?? I'd also guess (but don't know) that if you adjusted the 'ashkess' percentage then you wouldn't get any..

pgk
06-21-2008 05:50 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Quote 
I'd also guess (but don't know) that if you adjusted the 'ashkess' percentage then you wouldn't get any..

That's why I only use 3oz. per gallon of gas,, But even at that mix, if you continue to use it,, you will get carbon build up, and could possibly stick the ring,,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-21-2008 06:11 PM
HOMEPAGE  
 
 
shawmcky
Senior Heliman
Location: Isle of Wight,United Kingdom

Why mineral.

With modern synthetic oils having such good lubricating and protecting qualitys,if you run in on synthetic your engine will take a long time to run in.Mineral oil helps the engine bed in much quicker.Some engines have a job to run in at all on synthetics and just glaze the bores.I have stripped modern engines that have been run on fully synthetic and after 200 thousand miles you can still see the honing marks in the bores.Oils have come a long way.
06-21-2008 09:11 PM
 
 
ccm15
Senior Heliman
Location: Lake Ariel, PA

If it helps any, in general aviation aircraft engines all the manufactuters luch as Lycoming and Continental specify mineral oil only for the first 50 hours of operation to seat the rings before going to a semi synthetic blend.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.
06-21-2008 09:23 PM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
As you can see there is blow by, and the ring is stuck,,

Woohoo! I would say that engine was abused and has nothing to do with the oil used if it only had 3 gallons run through it. I wonder who set those needles?

Ace
What could be more fun?
06-22-2008 01:03 AM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Quote 
Woohoo! I would say that engine was abused and has nothing to do with the oil used if it only had 3 gallons run through it. I wonder who set those needles?

And once again AceTurd, you show everyone just how dumb you really are, with your worthless post!!!! You really don't know a thing about gas engines...


John Crotts
www.soonerhelicamproductions.com
06-22-2008 01:58 AM
HOMEPAGE  
 
 
TVAILLANCOURT
Senior Heliman
Location: Edmonton Alberta Canada

I just looked at mine and it looks nice and shinny.I ran 4oz per gallon.It looks nothing like the picture you have.So there must be some truth to what Ace is saying no?
06-22-2008 04:53 AM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

The whole point was NOT to run over a gallon of Lawnboy,,,once your ring is stuck you get blow by, The engine was not abused,, but by, running several gallons or Lawnboy ashless with lots of oil per gallon will stick the ring from carbon build up, period.. I forget how many oz, he was useing but it was allot, and several gallons, and yes he was rich on the mix, that didn't help matters either, But NOT LEAN!!! XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-22-2008 05:11 AM
HOMEPAGE  
 
 
THX1138
Elite Veteran
Location: Plainfield, IN

Thank you guys for the great info. I am pretty stoked about getting my P gasser in the air.

Lou

Bowstrings, Banjo's, and Birkenstocks.
06-22-2008 05:14 AM
 
 
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Gasser Model RC Helicopters > My first gasser
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