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. 

The extra space between the rear housing and firewall should allow for a
really neat accessory and exhaust installation. What are you plans for
the intake and
exhaust? I plan for the manifold runners to run over to the plug side of
the engine
where the throttle body would be located (peripheral porting would make
this must
easier to fabricate), with the exhaust running back to muffler that
exhausts on the
side.

I have been thinking about putting the two fuel pumps under the seat
where
the fuel lines tee. I have just helped with the fuel system installation
on a KR-2s.
Austrian rules require two fuel pumps, and fitting the two facet pumps
with their
check valves and a gascolator on a small firewall hasn't been easy. Does
anyone have any
input on the space amongst the seat ribs for fuel injection pumps? Do
they need to be
closer to the injectors? I need to get out these drawings and look at it
closer.

 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. 

Take a look at this drawing. It is for an RV6 but all major parts
could be squeezed into a narrower RV4 cowl. Especially if you
are going to have 44 inches between firewall and prop flange.
The RV4 firewall is 24 1/2 inches wide. That gives you about six 
inches on each side of the 12.5 inch wide engine for alternator 
one one side and muffler on the other.

You could use the Everett Hatch/Power Sport wrap over manifold instead 
of the wrapped up compact type shown. Plenty of room for that.
Also with a P51 belly scoop type rad and a bottom exhaust you have a 
problem getting the hot exhaust gases to not go into the rad intake.

Paul Lamar

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