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Bobby,
Another rule of thumb is 25%-30% for rad openings,
26 % is on the conservative side and as you say 21% is on the small
side.
I would be interested to hear about the cooling on
your next flight. I don't think I would use a oil to water rad arrangement
for the reasons you stated.
George ( down under)
George,
The 3 cu is working fine even with the oil to water
exchanger added 16F to the water. But-- my openings are 26% of the core face.
Even with openings at 21% and an OAT of 95F+ water
temps stabilized around 205-210 F on climb out.
The oil to water exchanger was the limiting factor with
only a 43F oil delta T. Increasing the radiator opens to 26% dropped both the
water and oil temps but not enough. My new half size oil to air cooler is
installed but the plane is at a fiberglass shop and I have not flown it with
any air flow to the cooler.
I have a high confidence level with my cooling system in
the Texas heat. I am also confident it has enough extra capacity for a 20B in
the future. And I am absolutely sure I have extra cooling drag and extra
weight. I hope to address cooling drag with a belly fairing after the wheel
paints and gear leg fairings are installed and I can benchmark the
performance.
Bobby
Bobby,
There has been some debate recently on 'cu" per
hp', I was wondering how the rule of thumb of 3 cu" per hp is working out for
you and if you would consider using less.
To be honest, I support the 3 cu " concept
but would consider less, if you felt 3 cu" per hp was excessive and
you were cooling too much.
George (down under)
Mark,
I think the original question was if a renesis water
pump with it's crude impeller has sufficient flow rate for a
20B? I don't know the flow rate but it works fine for my supercharged
renesis with 3 cu in per hp of radiator. Will it support a 350 hp
p-port 3-rotor? An improved impeller might be useful if it's marginal.
Bobby
Bobby,
As Tracy has said, "Better is the enemy of good enough". So, the
question is, is the stock Renesis water pump "good enough" to do the job
we're asking it to do?
Mark
On Fri, May 7, 2010 at 7:44 PM, Tracy Crook <tracy@rotaryaviation.com>
wrote:
My
Renesis pump has a grooved pulley as well. I drive it in the normal
fashion. I think the 3rd gen was driven from the back
side?
Tracy
On Fri, May 7, 2010 at 7:52 PM, Mark Steitle <msteitle@gmail.com> wrote:
Bobby,
Is your Renesis WP driven off the back side of the belt? The
aftermarket pulleys I bought have grooves, indicating that it is driven
off the grooved sided of the belt. I'll have to look tomorrow when
I'm out at the hangar.
Mark
On Fri, May 7, 2010 at 11:20 AM, Bobby J. Hughes
<bhughes@qnsi.net> wrote:
Mark,
I
spoke with Racemate a couple of years back about machining a better
impeller for the renesis. He needed the water pump housing for proper
clearances. He looked at the renesis impeller and thought it was
junk.
Bobby Hughes
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of
Mark Steitle
Sent: Thursday, May 06, 2010 6:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: alternative water
pump
Kelly,
Keep in mind that I'm comparing it to a 20B water pump, not a 13B
water pump. The 20B pump (housing & cartridge, no pulley)
weighs 11.8 lbs. The Renesis pump & housing after being cut
off the front cover is 4.5 lbs. So, I potentially can save over
7 lbs. The big question is if the Renesis WP flow is enough
water to cool the 20B.
At present, I'm still gathering parts for the conversion, so I'm
currently running the stock 20B pump.
Any idea what the Meziere pump weighs? You'll need to add
the weight of brackets too. The Renesis pump will fit onto the
front cover same as the stock pump... well, with a few minor
mods.
Mark S.
Michael,
Beautiful pump but did you see a few posts
back that Mark Steitle has
adapted a RX8 aluminum pump to his 20B and reported several lbs
of
weight saving..........Jump in here Mark............Photos
welcome !!.........
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Michael Silvius" < silvius@gwi.net>: --------------
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