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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › Vario R22 cooling mod
05-10-2011 07:42 PM  7 years agoPost 1
payne1967

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uk

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as i was asked for the pictures of a cooling mod on my vario r22 i'm going to post them on here so every one can see them
the mod was not my idea, it was from some good scale modelers from the south of england

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05-10-2011 07:52 PM  7 years agoPost 2
payne1967

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uk

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picture
1= my vario r22 with the vr22 mechanics
2= veiw of mechanicaly driven fan in the vario dummy fan housing
3= the rear of the dummy housing sealed back up after the mod
4= veiw of the lower air feed pipe to the cabin area
5= an extra fitted duct onto the engine that goes to the bottom of the cabin floor (note the one on the heli has slots cut into it for the drive belt to run through)
6= veiw of upper pipe to cabin/engine
7&8= veiw of duct on the engine
9= a backwards shot of the pipe work to the fan housing

the two flexable pipes are of a 1 inch diamater

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05-10-2011 08:16 PM  7 years agoPost 3
PETER ROB

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Devon UK

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cooling fan
Dave but you said our conversion did not work for you
Remember, I only suplied you with the fan, to fit the dummy housing, the rest of the work is your own
The conversion, the way we did it. is fitted into 5 R22's, and none have a overheating problem, even on the hottest days
I will dig out my photo's, we only used one cooling pipe directed straigh accross the carburator
Peter R

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05-10-2011 09:35 PM  7 years agoPost 4
payne1967

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uk

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Peter
I am very greatful that you supplied the fan.
I cannot take any credit for the idea, I may have machined up the bearing blocks etc to fit the fan into the housing and taking the drive off the mechanics and solved any issues that I had in doing the conversion but the thinking behind the mod was not done by myself, I can take credit only for my work that I've done.
I do think it is a fantastic idea.

Yes the mod didn't work as expected until i fitted the extended duct onto the engine, again this wasn't my idea.

I tried one and then two pipes as it didn't work as expected on this R22 and then the duct was fitted which gave the result we all are looking for.
The one pipe goes to the top of the engine directed at the engines cooling fan (this has worked via an electric fan on my Bell 222 with Morley F1 mechanics that I built a good few years ago)
the other pipe is directed at the carb, but I tried not to have it to close to the carb as I didn't want to cause any carb freezing issues
(I now know this isn't a problem)

As you say the 5 that was done all worked with great results and that is why I carried on with the hope that this R22 will fly without overheating with the doors on
The final testing was done on those realy warm days we've just had and the heli flies fine from start to the finish of the flight.

When I first had the heli I did try using an electric fan under the engine which did work and allowed me to fly doors on but the fans only lasted 3 flights until the heat of the engine destroyed the fan.

The part number for the duct is 104/24 and the guy's from the states that helped me use this on the later mid engined Bell 47 type mechanic'd R22

If you do take an older R22 apart to do the modification its worth having a set of layshaft bearings handy as they were very well worn on my R22.

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05-10-2011 10:31 PM  7 years agoPost 5
PETER ROB

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Devon UK

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Dave, thanks for the post
I am building a set of Bell 47 mechanics, and I have a new in box Vario R22 kit in the roof
Not sure if and when I will get the time to put the two together, too busy on other stuff
Talking with Ian B, a while ago, he said that Mike P was having overheating problems with their R22 build
Will be interesting to see what Mike comes up with
Peter R

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05-10-2011 10:55 PM  7 years agoPost 6
payne1967

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uk

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Mike fitted the 104/24 duct
and I think he made a belt driven fan and i think the fan unit was off a Trex 600, I don't know anymore details
But the guys state side just used the duct
With the 47 mechanics you cut out the bottom of th body and fit the duct into it with no gaps for warm air to flow back into the body
The duct is for the Vario Benzin Jet Ranger

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06-27-2011 10:31 PM  7 years agoPost 7
payne1967

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uk

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update on the cooling mod
as i couldn't make it to the rotory eagles fly-in but i did manage to get to fly i took the r22 out in one of the hottest days in the uk so far this year
my car was showing temps of around 29 deg c approx 84f
the r22 flew doors on without any overheating heating issues

i can't say the same for myself, i was sweating buckets

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