X-Mozilla-Keys:                                                                                 
Wrathall Mark wrote:

Paul,

At this stage I haven't ruled out anything. The P-51 style duct is
seductive.
My understanding is that an RV-4 is more flexible in W&B with the O-360, so
keeping the weight
Forward makes sense. I am still leaning toward the Steve Beckman style
installation, as it keeps all changes firewall forward. Change one thing
change everything! I looked over the plans last night, and  think that
running the coolant lines back to a radiator under the wing would be
challenging. You would
have to bore two rather large holes in the spar for starters. Brian, how do
plan to route them?

OOOOOOOO! I don't think Van would like that at all :-) Might not hurt
but he sure would not like it. 

If you run those lines inside the fuselage and you had a leak it could 
be painful until you got the airplane back on the ground. PL

        Brian Trubee  wrote:
        The question about putting a radiator in a scoop under the wing was
probably directed to me- it's my intention to put a 24 x 8 x ~3 thick
radiator under the main wing spar, with the scoop opening located 1"
underneath the firewall, and the variable opening exit back by  the f-408
bulkhead. In order to maintain an acceptable CG, I plan to put the prop
flange 44" in front of the firewall. This is done more by a WAG than by
calculation.

        A stock oil cooler will go up front in the engine cowl, and I will
probably also augment oil cooling with an oil/ water heat exchanger.
Unfortunatly, work has been suspended until my house addition is done in
late January.
                 > Brian Trubee  Redmond, WA

        Thanks Brian. I haven't checked my plans yet, but how much further
        forward is this than the standard prop flange location? I like the
simplicity of this idea.
        I was picturing the radiator further back.

        Mark Wrathall
        Vienna, Austria.
        RV-4 (to be plans built)

        Mark, why did you rule out the Steve Beckman radiator under the cowl
arrangement? There seems to be plenty of room under the engine for a 16 inch
wide by 20 inch long angled radiator. You would then not have a coolant
external plumbing problem back to the rad mounted under the wing spar. Fred
Moreno thought the angled rad blowing air over the engine was a good idea.
Would work even better with a side exhaust.  The side exhaust  really
simplifies things a lot. Rare Bear uses side exhaust over the wing and it
apparently does not slow down Rare Bear. PL

 
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