REFLECTOR: dual exaust

[Grover McNair]

I have had success drilling 2 1/8" holes in the side of a thermostat. It helped coolant flow quite a bit since the thermostat is the most restricted part of the cooling system. This was in a race car engine. It did not change the warm up time much at all. There was no down side that I could determine and it lowered the coolant temp by about 7 degrees
Grover McNair

Sent from my iPhone

On Apr 12, 2012, at 11:02 AM, "Alex Balic" <velocity_pilot at verizon.net> wrote:

> Hey Ron,
> Probably best not to remove the thermostat- the engine will not have any way to control it’s temperature, and you will be burning more fuel-  it is a tempting thing to do, but you might try to replace the thermostat first to see if maybe the old one is faulty.  I guess you got that stumble fixed!
> What do you have for outlets now? I am starting with just the factory ones, but have plans to add more- I figure, we have the 2 NACAs feeding the cowling, and the ram scoop feeding it too, and just the 2 small round outlets and whatever can get out around the spinner- certainly not enough.
> Strange about the longer takeoff roll but better climb? Let me know if that is a permanent thing- maybe you had more fuel or something?
> Got any video of your flights?
>  
> Alex
>  
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Ron VelocityXLFG
> Sent: Thursday, April 12, 2012 8:18 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: dual exaust
>  
> I got to test my dual exaust last night. Did not really make any more noise than with one exaust
> outlet. Still sounds so cool at least that is what the guys in the hanger say . The most interesting
> thing is that my take off roll was more  but my climb out was  much better.
> I think I increased my roll out by  2-300 ft  and gained 200 fpm climb. Cooling I think is better because of less
> exaust pipe under the cowling and I added another outlet to the cowling. I am going to try more outlets
> to see if I can get the cooling even better. I have heard of removing the thermostat to help in cooling and
> I might try that also.
>  
>   I got her up to 175 knots for a short blast, that’s  fastest I have gone yet no flutter but man is the stick
> sensitive at that speed.
>  
> Ron
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