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| Good point Bill. I was thinking more of takeofff/climb and cruise modes (vs race mode). On takeoff, I usually see around 6700-7000 rpm for a short time, then between 5100 - 5500 rpm in cruise. Your friend is more likely running around 9000-10000 rpm, albeit for a shorter period of time. I'm not saying I wouldn't welcome a better water pump, just that there are many flying Renesis engines without any documented water flow problems. Will the Renesis pump capacity pump enough water to cool a 350 hp 3-rotor. Who knows? Frankly, I don't even know how much flow we're talking about here. For safety sake, if a better impeller was available, I would most likely buy it.
Mark On Tue, May 11, 2010 at 1:22 PM, <wrjjrs@aol.com> wrote:
Mark,
Here is the thing to think about. A friend of mine who races rotary cars asked about the need for a better water pump. I asked him how long his longest straight is. "About 3/4 of a mile" he said. Well if you are running your airplane in a race the straight away might be 500 miles long! You would be hard pressed to find a circumstance where you had too much water flow.
Bill JepsonSent from my Verizon Wireless BlackBerry
Date: Tue, 11 May 2010 08:08:50 -0500 Subject: [FlyRotary] Re: alternative water pump
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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