New liquid cooled gas aero engine !  
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New liquid cooled gas aero engine ! - 5/29/2005 12:17:29 PM   
Strykaas



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Joined: 3/21/2003
From: Paris, FRANCE
Status: offline 		Hi !

I've just found this on MVVS web site :

I can't see the point of adding such complexity... Well, it's cool to have a cooler ( ) under the fuselage, but what's the point ???

Nice piece of engineering, though.



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RE: New liquid cooled gas aero engine ! - 5/29/2005 1:09:14 PM   
Diablo-RCU


 

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Status: offline 		Liquid cooled engines can be made to delivery higher power because it's easier to control temperature. All of the 2-stroke motocross engines and 500cc GP engines are liquid cooled for that reason. The only disadvantage is weight and complexity, which can be a problem for model planes.

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RE: New liquid cooled gas aero engine ! - 5/29/2005 4:22:05 PM   
dirtybird


 

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quote:

ORIGINAL: Diablo-RCU

Liquid cooled engines can be made to delivery higher power because it's easier to control temperature. All of the 2-stroke motocross engines and 500cc GP engines are liquid cooled for that reason. The only disadvantage is weight and complexity, which can be a problem for model planes.


I think that disadvantage will far outweigh the advantage. Most of us are not racing our airplanes.

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RE: New liquid cooled gas aero engine ! - 5/29/2005 6:11:52 PM   
Strykaas



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Status: offline 		Using such an engine in a warbird who actually has big coolers / radiators may be nice. We could install this cooler at scale locations .

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RE: New liquid cooled gas aero engine ! - 5/29/2005 6:25:35 PM   
Rupurt



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Status: offline 		I would have to agree with dirtybird, besides any small power advantage would be lost with the extra weight and having to run that little pump all the time, it looks like some one at mvvs have fun designing it though and they definitly deserve some credit for trying new things.

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RE: New liquid cooled gas aero engine ! - 5/29/2005 6:47:06 PM   
Strykaas



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Status: offline 		I'm not sure that setup is really WAY heavier than a std setup, as there is NO cooling fin on the head of the engine, and these fins are by far thicker than a cooler's fins, that can actually be very light. I would like to know the weight of the cooler.

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RE: New liquid cooled gas aero engine ! - 5/29/2005 7:02:20 PM   
BRYAN01601



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Status: offline 		I am sure the weight of the fins is far less than the water . Also the cylinder wall's would need to be thinker to acomodate the cooling ports the water runs through

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RE: New liquid cooled gas aero engine ! - 5/29/2005 9:16:23 PM   
Rupurt



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Status: offline 		Strykaas did you get the displacement of this engine?

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RE: New liquid cooled gas aero engine ! - 5/29/2005 9:24:16 PM   
JBrannon



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Status: offline 		This most likely is a Marine engine someone decided to put in a plane.

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RE: New liquid cooled gas aero engine ! - 5/29/2005 9:43:53 PM   
Willdo


 

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Status: offline 		BRYAN
The walls do not need to be thicker, - all that is necessary is a light water /coolant jacket, which in this case (and in most cases), is an integral part of the casting.

PURISTS
The fact is, MVVS have taken the risk and have gone and done it anyway, and anyone who can design and produce castings like that can't be too silly. Radiators may be a little pricey though but that won't stop a lot of people buying them.

It's all probably unnecessary, ( but interesting ), as are all the other hi tech gadgets we have.

I'm sure our wives, girlfriends etc, can't see any sense in us having model aircraft at all!


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RE: New liquid cooled gas aero engine ! - 5/29/2005 10:24:58 PM   
Geistware



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Status: offline 		The amount of water in the system may be small.
Also the coolent could be something other than water .

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RE: New liquid cooled gas aero engine ! - 5/29/2005 10:52:56 PM   
fiery


 

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Status: offline 		The amount of coolant in the cooling system is 200 millilitres (0.2 litre). Or, 6 1/2 fluid oz's for those in North America.

This is a version of the successful 58cc IRS R/C aircraft powerplant recently developed by MVVS, not a marine powerplant.

It has been out for some time. I expect it will do well, especially with the warbird/scale fraternity. I believe the weight is not significantly greater than the air cooled version. The MVVS brochure linked as a pdf file on Pe Reiver's site says the weight of the engine including the water pump is 1830 grams - only 10 grams more than the standard air cooled 58 IRS at 1820 grams!

The heat exchanger weighs a further 120 grams. Ignition adds a further 165 grams in both cases. It may also be easier to cowl in a scale like manner in many installations - no need to worry about cooling ducts, baffles etc.

Weight is not often a huge issue with warbirds. G62's and other commercial conversions (the type of engine this may be intended to replace) are often not exactly at the low-end end of the weight spectrum.

I fully expect that water cooling will become more common on larger spark engines. I also expect that noise reduction (due to the silencing effect of the water jacket) will also be an operational side benefit.

fiery

< Message edited by fiery -- 5/30/2005 6:23:13 AM >

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RE: New liquid cooled gas aero engine ! - 5/29/2005 10:59:53 PM   
Rupurt



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Status: offline 		Ethylene glycol (C2H6O2) is a fairly standard coolant and I think it is heavier than water .

< Message edited by Rupurt -- 5/29/2005 11:01:13 PM >

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RE: New liquid cooled gas aero engine ! - 5/31/2005 3:09:15 AM   
Heli32


 

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Status: offline 		EEKss!! No thanks!! Would make a better boat engine.

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RE: New liquid cooled gas aero engine ! - 5/31/2005 4:00:35 AM