Switch
on pump when cooling needed.
Sounds simple enough (of course
installation at this point is not simple). Does that tubing withstand contact
with 225F cooler??
For
static testing, a better solution is a garden hose with a spray nozzle.
Hose down the coolers liberally when needed. This is the method used on
my test stand.
Unfortunately; no water supply available
at the hangar. Maybe one my grandkids “water blaster” water
guns.
Al
-----
Original Message -----
Sent: Wednesday, May 10, 2006 10:31 AM
Subject:
[FlyRotary] Airworthiness
Good
News: Velocity N755V received FAA airworthiness certification
yesterday. Also survived an intensive 4-hr inspection by a factory
authorized insurance inspector with a small list of minor items to attend to.
Not
So Good News: Main issue now seems to be cooling during ground
operations, particularly oil cooling, and the secondary temporary issue of
mixture reprogramming (again, after software update). With the wing root
cooler in a pusher configuration there is almost no oil cooling when standing
still. So running at significant power to adjust mixture allows little
time to do anything before reaching temp limits. Then, with cowl on, it takes
hours for it to cool down.
My
expectation was for enough natural convection cooling on the ground to handle
low power taxi operations. Earlier static running suggested that there
would be sufficient time, but I’m finding that; a) taxi maneuvering with
brake steering takes more power than anticipated, and b) the 3” thick, 16
fins/in. oil cooler core has almost no natural-convection cooling. Have no good
ideas at the moment how to improve this situation. Haven’t gotten
to high speed taxi yet to see if temps stabilize.
Tracy; can you tell me the basics of your water spray system?
The
in-cowl coolant rad gets reasonable air flow because of negative pressure
generated by the prop aft of the cowl.
More
later,
Al