HobbyParts 25 engine

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Don Holmes
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Re: HobbyParts 25 engine

Post by Don Holmes »

O'Donnell
super sport red
Don Holmes RCCA #957
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dditch
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Re: HobbyParts 25 engine

Post by dditch »

I took the muff off to mount the engine last night.
Sleeve is Brass (golden). Piston is silver color. No Ring
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Don Holmes
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Re: HobbyParts 25 engine

Post by Don Holmes »

all the newer engines are brass sleeves but the inside is plated. In Japan they use Nickel and China they still use chrome Loose EPA there

Chrome last longer..
Don Holmes RCCA #957
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o1moregil
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Re: HobbyParts 25 engine

Post by o1moregil »

are you gonna use this engine for open b? if you do can we get some rpm's readings with a 9x4 and can :D , thanks!
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dditch
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Re: HobbyParts 25 engine

Post by dditch »

o1moregil wrote:are you gonna use this engine for open b? if you do can we get some rpm's readings with a 9x4 and can :D , thanks!
No plans, Don't know of any local Open B, it's all SSC and 2548 around here I think.
I used 9x4 to break in but did not measure RPMS at peak.
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Don Holmes
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Re: HobbyParts 25 engine

Post by Don Holmes »

David and I are flying in 2948.
I did tach my XLS .25 with a mousse can and pipe, Can't rember
the numbers but I know they were in the upper 19,s (19,700 I think ) with 20% nitro and 20% castor
David said the photo of the XLS.25 is what he got ( will he got the engine ) and that makes sense to me ASP and Magnum same mold.

David 15,000 with 15% nitro and a 9 X 4 prop sounds low to me are you going to tach her some more
with the 9 X 4 and no Baffle in the muffler?
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David Drowns
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Re: HobbyParts 25 engine

Post by David Drowns »

There's no 2948 in Ca. yet. The test engine on a pipe after it was well broken in hit 19,300 with a 9x4 mas on 15% fuel.
They will rise after breakin so time will tell.

Terry Yates "still4given" who got ahold of the test engine when Mike was done with it has a new 25 XLS and here is his report and results.

I got a chance to do some break-in on my new .25. The numbers on the muffler were about what I expected but it was a little down from the prototype with the combat can. Probably going to need some more time to loosen up the top end. I had already removed the baffle so I didn't get any numbers with the baffle in.

Here are the numbers after three tanks running slightly rich with complete cool down in between. MAS 9x4 for breakin

I ran the props I had on hand.

MAS 9x4 17.6K muffler 18.4K combat can
APC 9x4 15.6K muffler 16.2K combat can
MAS 9x5 14.6K muffler 15.1K combat can
MAS 9x6 13.8K muffler 14.3K combat can
APC 9x6 13.1K muffler 13.6K combat can
APC 10x4 12.5K muffler 12.9K combat can
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Don Holmes
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Re: HobbyParts 25 engine

Post by Don Holmes »

David Drowns
What % nitro are you running and are you adding castor oil ?

My Mix,s were between 25% and 10% and I always add castor for Magnums and ASP it even picks up the OS LAs
My numbers are higher but then I ran my engine in on a 8 X 3 hiting close to 22,000 on pipe.
I got 21,118 with 8 X 3 and the muffler
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dditch
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Re: HobbyParts 25 engine

Post by dditch »

Don Holmes wrote:David and I are flying in 2948.
I did tach my XLS .25 with a mousse can and pipe, Can't rember
the numbers but I know they were in the upper 19,s (19,700 I think ) with 20% nitro and 20% castor
David said the photo of the XLS.25 is what he got ( will he got the engine ) and that makes sense to me ASP and Magnum same mold.

David 15,000 with 15% nitro and a 9 X 4 prop sounds low to me are you going to tach her some more
with the 9 X 4 and no Baffle in the muffler?

15,000 with 9x4 was by running rich, it would go faster than that.

MAS 10x4 with stock muffer and baffle removed, 15% COOLPOWER was 14,300
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David Drowns
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Re: HobbyParts 25 engine

Post by David Drowns »

Don Holmes wrote:David Drowns
What % nitro are you running and are you adding castor oil ?

My Mix,s were between 25% and 10% and I always add castor for Magnums and ASP it even picks up the OS LAs
My numbers are higher but then I ran my engine in on a 8 X 3 hiting close to 22,000 on pipe.
I got 21,118 with 8 X 3 and the muffler
I was running Omega 15%...It calls out a castor / synthetic blend but doesn't list the % :roll: kinda makes you wonder.

Didn't have any extra oil to add, just ran the fuel as is.
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EK
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Re: HobbyParts 25 engine

Post by EK »

Omega - 17% total oil, 30/70 castor/synthetic
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David Drowns
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Re: HobbyParts 25 engine

Post by David Drowns »

EK wrote:Omega - 17% total oil, 30/70 castor/synthetic
Thanks Evan.
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dditch
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Re: HobbyParts 25 engine

Post by dditch »

At the fall FSA event in 2548 I flew the Hobbyparts ASP .25 AII (Magnum 25XLS?) in 3 rounds. The best it would tach with the MAS 10x4 was 13,900.
I am taking some suggestions people gave me and will try it out this week or next before the Street Brawl on the 13th.
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Re: HobbyParts 25 engine

Post by boiler »

With my FX 25 on 30% heli fuel my best rpm has been 14300 running the mas 10x4. I run a standard muffler without the baffle. It does unload in the air but not on the ground.
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Don Holmes
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Re: HobbyParts 25 engine

Post by Don Holmes »

Running Blue Thunder at 10% nitro 18% castor oil stock muffler and MA 10 X 4 14,780RPM
she turns. well seeing is believing . It is a .25XLS
Dave your engine will losen up and turn higher RPMs.
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Don Holmes RCCA #957
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