REFLECTOR: Need for Cabin Heat at Altitude

[Brian Michalk]

Okay, that does look just like the Jabsco blower that we found.

How long did it take to bring your oil temps down to 195F, and did you 
stop taking data at that point, or did it stabilize there?



On 6/28/2013 8:05 AM, Ruben Creus wrote:
>
> I sent this message was it was not posted, so here goes again... see 
> if this time works.
>
> Here I attach some pics. As you can see the flap opens and closes that 
> naca scoop. As the fan is pointing at a 90 degree angle in relation to 
> the oil cooler you need to create a perfect seal, so the naca scoop 
> becomes a chamber where air gets pressurized and the only escape is 
> the oil cooler.
>
> In my tests I noticed that if the chamber is not a perfect seal, then 
> and air escapes, if the air escapes then there is I no pressure built 
> up, and therefore no air going to the cooler, but when the chamber is 
> sealed then all the air builds up and can only go to the cooler. The 
> other test I did was with a normal blower fan, and it losses a lot of 
> CFMs vs. de squirrel cage fan that loses very little CFM. You can see 
> that on the fan manufactures specs. Someone wrote a nice message 
> explaining the difference and the reason for this. What I found out 
> that the propeller design does not move much air when it has pressure 
> in front of it, but with the squirrel cage each blade pushes air to 
> the next and so forth... I am not fan engineer, but in practical terms 
> it was a huge and extremely noticeable difference. I guess that is why 
> they use squirrel cage fan for all ducting systems (like A/C) use 
> squirrel fan, and open air systems use normal fan propellers.
>
> I did a test yesterday. OAT was 35C (95F).  I started the engine and 
> the oil go up to 215F, then close the flap and turn the fan on and oil 
> temp when down to 195F, allowing me to stay in the ground for as much 
> time we want. (very convenient in large airports).
>
> The other tests was in flight to close the flap and open the fan, and 
> I had a very decent amount of air going to the cabin, pretty hot air!! 
>  So very promising. Now I just need to wait until the winter to give a 
> final verdict, but the amount of air is very decent and the 
> temperature was very hot. So we will see what happens in the winter 
> months.....
>
> I hope this is helpful and not too boring.
>
> Ruben
>
>
>
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