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Cooling Fan

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dpark

Joined: 25 Sep 2013
Posts: 30
Location: Heald Green

Posted: Thu Aug 25, 2016 4:19 am Post subject: Cooling Fan

Has anyone fitted a cooling fan to assist ground cooling. If so specs. please. 

Dave Park

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_________________
Dave Park G-LDVO Europa XS Trike 912uls

rampil

Joined: 04 May 2007
Posts: 870

Posted: Thu Aug 25, 2016 5:51 am Post subject: Re: Cooling Fan

Unclear here.



What are you trying to cool on the ground?



I have three fans in my panel, for example. They are barely enough.

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_________________
Ira N224XS

dpark748(at)icloud.com
Guest

Posted: Thu Aug 25, 2016 6:13 am Post subject: Cooling Fan

It was relating to the subject, water radiator cooling on ground.



Dave Park

 	  Quote: 	
		   On 25 Aug 2016, at 14:51, rampil <ira.rampil(at)gmail.com> wrote:

 

 

 

 Unclear here.

 

 What are you trying to cool on the ground?

 

 I have three fans in my panel, for example. They are barely enough.

 

 --------

 Ira N224XS

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=459881#459881

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Burrilla

Joined: 25 Apr 2015
Posts: 187

Posted: Thu Aug 25, 2016 6:51 am Post subject: Cooling Fan

One of the first issues is the operating temperature range of the fan.

Most of the Computer Fans, 12 volt and small enough to fit under the cowling, are rated to +40 or +50 C where we are talking about temperatures above that.

There are vehicle fans but these are much larger.

A manually switched fan was, is, fitted to the SkyArrow and the Operating Manual advised its use when the coolant temperature on the ground goes above 80 C but not sure of its source. The SkyArrow had a pusher prop so the airflow through the radiator on the ground wasn’t great.

Alan

G-OBJT

 	  Quote: 	
		   On 25 Aug 2016, at 15:12, david park <dpark748(at)icloud.com> wrote:

 It was relating to the subject, water radiator cooling on ground.

 Dave Park

> On 25 Aug 2016, at 14:51, rampil <ira.rampil(at)gmail.com> wrote:

> 

> 

> 

> Unclear here.

> 

> What are you trying to cool on the ground?

> 

> I have three fans in my panel, for example. They are barely enough.

> 

> --------

> Ira N224XS

> 

> 

> 

> 

> Read this topic online here:

> 

> http://forums.matronics.com/viewtopic.php?p=459881#459881

> 

> 

> 

> 

> 

> 

> 

> 

> 

>

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rparigoris

Joined: 24 Nov 2009
Posts: 797

Posted: Fri Aug 26, 2016 12:51 am Post subject: Re: Cooling Fan

Hi Dave



Check out our album:

"COOL THAT ROTAX 914":

http://www.europaowners.org/main.php?g2_itemId=86934



I have a Mono with 914. Not flying yet. My partner and I have quite a bit of experience fooling with Flying Wing Electric Powered RC models and that technology and knowledge is being implemented to help with cooling and heating of our 914. 

First off a computer fan isn't going to do much as far as moving much air. If you plan on running air through the radiator, you need some serious pitch speed, most auto fans are not up to the task, they move a lot of air but too slowly.

I'm going to use three fans. On our album at the moment I have brushed motors, but may switch over to brush less for the radiator fan.

I don't think anyone complains much about cooling if they leave the top of the cowl off when on the ground. I'll be using short can speed 400 motors aimed at the gills on each side. They move quite a lot of air. On low speed, could cool things after you shut down

As far as water radiator, somehow once flying and in cruise, you don't want to block off air flow with a windmilling fan with low pitch. Thus I'm going to use a folding high pitch propeller with long can speed 400. About quarter size when folded. It really moves air nicely through the radiator. I also am incorporating reverse for the prop. You see with a high camber wing, it's usually a pretty poor performer when you fly upside down. Well if you want a really bad performer, try flying a high camber wing upside down and backwards! When in reverse, that's exactly what I will be doing. I have a pretty high performance fiberglass covered foam flying wing slope soaring RC. When it's blowing soarable, can't get it out of the sky. With a flying wing when you change something to add drag, it usually pitches you one way or the other. Anything that is easy to do wasn't very effective. Except having a small motor with folding prop and putting it into reverse! Dang, makes terrible noises from the awful things being done to the clean laminar airflow, but it in fact allows pointing the nose down at a 45 degree angle and not over-speed! We tested deploying folding prop in reverse hanging out the sunroof of my Volvo Station Wagon at 80mph, a little over off on the throttle and the folder is fully deployed. 

What does this have to do with my Europa? For not many amps, I can run in reverse and constipate any excess airflow through the radiator I don't want. For one when things are over-cooling in cooler weather, but it would be very "kool" if for a few amps I can increase cruise by decreasing cooling drag.



Ron Parigoris

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gregoryf.flyboy(at)comcas
Guest

Posted: Sun Aug 28, 2016 6:41 pm Post subject: Cooling Fan

I was hoping my fan was reversible (constipating airflow in the radiator

could be handy at low engine power levels too...say 55% and less), but

unfortunately it wasn't..



--

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