I just could not resist. Anyone tried one? I'm gonna stuff it in a Gremlin.
The throttle intake dwarfs my 25LA and Webra Speed 28. Looking into the exhaust port, the intake ports are huge also.
I'll post tach readings once I have them.

Barry

Looks Great. That sure is one pimped-out motor. What do you figure it would cost after has a few dirt naps??[sm=confused.gif]

Is that your way of telling us you can't keep a Gremlin in the air 8-)

I'm not sure how it will hold up. My OS25LA has consumed two backplates already. I'm not that hard on engines, although my some in my club might point out that my inverted hand launches don't always get away as expected.

Barry


Has anyone actually run one of these? or better yet flown one?

What exactly is that engine? The case looks like a Webra, as does the carb, except for the purple.

Well spotted. It's a WEST by WESTON made for them by Webra.

What is the engine's displacement and cost?

It's a .25 and cost me 66 Pounds Sterling, delivered to my door. I ordered it Monday and it was in my mailbox Saturday.
Not a bad turn around.

So less than $120.00 US that's not as bad as I thought. Guess they haven't started charging to Pimp-Out a motor yet . LOL


Also the comment about dirt naps was not so much my piloting skills ( or lack there of ), but the fact most R/C combat planes lack an on board collision avoidance system and the resulting entanglements some times make it difficult to remain airborne with only one wing.

you'll have fun with that,they are an awesome engine for the price.

Are they very common in the UK ?

Barry

Hi Guys

I have a couple of the weston .25 engines.

I have run one ready for installing into a combat hellcat.

The engine took 8 tanks at full blast just to stop it squeeking at tdc. and it has now become reliable ready to use.

I pulled out the restrictor in the exhaust silencer, it was pulling around 19000 rpm on a 7x6 master airscrew.

I think its still running in at present and I suspect it will continue to increase in power over the next 10 flights or so.

In summery it looks great but it takes ages to run in.

Good luck

A 7-6 is an awfully small prop for combat with an engine of that size. I would be more interested to see what it will turn a 9-5 APC. Out of the box a stock .25 FX will turn one of those at 16,000. To me that is pretty much the standard at which performance should be compared. It seems the trend though has been to add the mouse can pipe with a MAS 9-4 to get around 19,000. I still prefer the APC props and I feel my planes perform better with the engine stock.
The Jett .30 does better but it is significantly more expensive.

Purchased mine for Gremlin Combat. Compared it to an OS25FX and with the Stock Weston Muffler there was NOTHING between them both on 15% and APC 9x4. RPM's were within a couple hundred of each other.
Problem appears to be that the weston 25 stock muffler chokes the motor. In fact the passage from the engine into the muffler body is restricted so much by a single drilled hole that I contacted Weston in the UK to make sure it was actually correct. The OS motors have no such restriction for gasses getting into the muffler body. I still think the weston may show promise, but only if your rules allow non-stock mufflers to be used.

Fwiw, the Webra is basically in the same boat. With a mousse can, it really is more powerful than an OS .25FX, no question about it. The huge carb opening is a big reason why. The Webra also has more aggressive port timing. You can actually add quite a bit of power to an OS .25 just by putting an OS .32 size carb on one. Instant power increase.

The downside of the large carbs is that fuel draw is reduced, so you have to be more picky about your tank install or use a bladder or other fueling system. I don't have any problems with my Webra's on a normal tank, but I know other guys have, and I think that's a big part of why.

On muffler, the Webra seems to be a bit more powerful. I'm using an OS muffler on my Webra's, with the baffle removed. Same muffler on the OS engines, and the Webras seem to generally out turn my OSes. YMMV

you need to remember that we use low nitro content in the uk due to the massive cost of it over here, so we tend to stick to 5% nitro which is still about 30-35 dollars a gallon 30% is about $120 - $150 a gallon(GULP)
so youll find that nearly all UK spec motors run better on 0-10%MAX nitro

goony

I thought there would be more of a draw on fuel. The bigger the hole, the more the flow.

fuel consumption is higher with the webra, yes.

the ability to draw fuel from the tank, ie the "suction" power of the carb is lower though. It's physics, a larger diameter pipe is going to have a lower velocity, and that means less of a pressure differnece to suck fuel from the tank.

So a larger carb throat will allow more air in to the engine, which means it can burn more fuel. But the engine is going to have a harder time getting fuel from the tank, making the fuel system setup more important.