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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Evolution petrol engines
01-05-2018 06:37 AM  5 months agoPost 21
goodhunting

rrApprentice

Slovenia ... somewhere in Europe

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mecha1000
i wonder how the vario gas helis last for so many years. Do they have an electric fan to cool the fuselage?
What Vario does in their scale fuselages is make a large hole on the bottom of the helicopter for ventilation... some people mask it with a mesh but it is still obvious that it is present.
I have one or two Vario kits and opted for electric power in those... but next in line should be the Schweizer 300 which will be a gas powered helicopter...
there are ways to do it... and if you look at the scale threads (mostly in Europe) you will notice a lot of gas and glow gassers in Jetranger and Hughes fuselages. There in addition to the bottom hole, modelers left the rear windows off so that the engines do get enough air flow...

with the scale helicopeters... everything can be done... but at what cost... (sometimes the look of the helicopter and other times with additional weight of the cooling system)

gh

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01-05-2018 03:09 PM  5 months agoPost 22
RM3

rrElite Veteran

Killeen, Texas - USA

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yeah... if going scale... go all the way...

cutting holes everywhere, taking the "windows" out and then the sound dont match (angry weedeater)...

..results in a half-a$$ed scale heli...

I used to want a scale AH-64 in 800 size (Ive grown up since then... I think)... but gasoline or even glow would have ruined the whole illusion during flight.

showing a preference will only get you into trouble, 90% of everything is crap...

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01-05-2018 03:55 PM  5 months agoPost 23
goodhunting

rrApprentice

Slovenia ... somewhere in Europe

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RM3
I used to want a scale AH-64 in 800 size (Ive grown up since then... I think)...
You can never outgrow such desires...
Approach engineering does one in 600 size made from balsa...
Vario makes one in 800+ size ...
I believe that both are still whispering your name...

Klem

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01-06-2018 05:16 AM  5 months agoPost 24
Gearhead

rrMaster

Vt

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he could build a Bell 47, that would get around the problem

Jim
Buzz Buzz Buzz

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01-07-2018 10:17 PM  5 months agoPost 25
mecha1000

rrNovice

Mount Royal, NJ

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Evolution
Guys thank you for the great feed back and the link to the MVVS cooling system. A lot of good information out there, just need to put it all together and develop the plan. I am now in search for a Trex 700N to use in this project. But first, I will be ordering the new Evolution pumped motor and setting it on a workbench to monitor temperatures with and without the water cooled system. Should be an interesting project. I am in no rush, so will take my time.

Ideas are welcome....

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01-08-2018 02:42 AM  5 months agoPost 26
Gearhead

rrMaster

Vt

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Ideas are welcome...
so you are going to use the Trex 700N, and water cooling is going to add weight, I would think you are going to need more power than what those Evolution engines deliver,,  

how are you going to cool the Cylinder ?, adding coils is not enough, you will have to add a cooling sleeve, believe me I know, I ran Gas and Glow boats in the 90s, and Helis run hotter than the average boat because the Heli engine stays at peak RPM even at half throttle,,

to add, some one has already tried what you want to do, the guy spent a lot of money and gave up on it, you will have to search RR or Heli Freaks to find the thread
it should be a direct swap based on what i have researched which i dont see a problem with
you will see a problem if you can't tune it correctly

Jim
Buzz Buzz Buzz

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03-01-2018 10:48 PM  3 months agoPost 27
ChrisO

rrNewbie

Barron, WI USA

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mecha1000
I am now in search for a Trex 700N to use in this project. But first, I will be ordering the new Evolution pumped motor

Ideas are welcome....
I think the best idea would be to buy a decent engine. In my experience those Evo engines are finicky to begin with and a .60 gas does not have anywhere close to enough power for a 700-class helicopter for scale. They are made for 12 x 6 airplane propellers.

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03-02-2018 03:15 AM  3 months agoPost 28
mecha1000

rrNovice

Mount Royal, NJ

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Thanks for the feedback. I bought a whiplash gasser. A lpt less to worry abou.

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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Evolution petrol engines
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