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Hey Bobby, I suspect that 34-36# number
is for 2 blade composite blades in a constant speed hub. A typical
Hartzell 2 blade aluminum for a 4 cyl Lyc weighs about 55# (not
including the governor). The Sensenich fixed pitch metal for Lycs
on RVs weighs about 35#.
Charlie
On 1/30/2021 6:32 PM, Bobby Hughes BHughes@qnsinc.net wrote:
The
anemometer will add a little flow resistance. Charlie’s tuff
test may be easier to visualize while trying different
during vanes. The prop is rated for an IO540 or up to 300
HP. Surprisingly most constant speed props rated for 180 hp
+ weigh in at 34-36#.
Bobby
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Friday, January 29, 2021 11:02 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Ross Farnham - Cooling video
Bobby, I am going to bring down a leaf
blower with my anemometer and take measurements. Will add
some turning vanes and test on the ground. This is the
tinkering I like to do, now that I have a flyable plane.
Holly crap, 48lbs for electric prop?
Charlie, thank you for the pictures (and videos). I wonder
with my digital electronics, if I can get accurate enough to
measure the pluses. Place two pitot tubes facing front and
back inside the ducting. Hmm interesting. I agree with you
that the wedge in theory is different than in practice. My
ducts are the same idea as yours, so will add the turning
vanes.
Jeff, I wish we could exit out exhaust out the sides like in
the Bull Moose. I think with our high velocity of
exhaust exit speed, we must be able to harness that energy
to help pull air out of the cowl. Just a trade off of having
a short exhaust dumping out, or long exhaust under the cowl.
Le Roux, thank you for the pictures. Right now I'm trying to
duct my side oil rad, down and out the cowl. If I need to
get a bigger oil rad, I'll have to move things around and
add side adjustable cowl louvers I think.
Here is a link to the old contact magazine on old
installations.
You will see the side louvers on Ed
Anderson RV6A
Maybe he has still photos of the
side louvers in his engine cowl.
Think it is very effective if you
install it for a side mount radiator
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