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gents,
Many thanks for the figures. seems that I may not be too far out at this stage.
More flying and figures from summer turbulence! Takeoff Rpm just over
6300, I think, and then found the mix was very lean. Had to turn the mix Knob
almost to 2,30 and that fixed the very high EGT’s as well. The engine
seems very happy in cruise at 5300 to 5600 depending on how much fuel you want
to use. 5400 rpm and 22.9 MAP and the fuel I havn’t a clue as have been fiddling
to get it to read Litres. Flew over 2 hours, so will fill the tanks and get an
idea at least, but going at a guess may be around 7.9 Gph at anywhere between 3
and 5000 feet depending on the thermals. I have a glastar, so only
expecting 130 Kts. Currently getting about 110 or possibly better. Then I have
removed the wheel spats for flight testing in case I had to land in someones
rough paddock, so that may be a loss of 5 kts or more, then obviously have too
much cooling drag as today with 8 inches of my water exchanger blocked off, I
could only get the water to 160 degrees and oil at 155 degrees, and that is at
OAT of high 80’s. Now to experiment at how much I can block off the inlet
to get temps up to 185. Tracy, your gear is brilliant,
congratulations. Neil.
Sent: Saturday, December 14, 2013 3:30 PM
Subject: [FlyRotary] Re: 2 cycle premix
I get about 185 mph and
8 GPH with my Lancair Legacy FG with the Renesis at about 5800-6000 RPM, but I
doubt I could get 224 mph in a dive! :>)
Bill
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy
Sent: Friday, December 13, 2013 9:02
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: 2 cycle
premix
Speed about 165 - 175 mph, 6.5 - 7.5
GPH. These are the Renesis numbers on RV-4, not the 20B
RV-8.
Tracy: what speed
and fuel burn at your cruise settings
Kind Regards
I typically cruise at 5400 - 5600 rpm.
WOT at top speed (224 mph) rpm is 7250.
If you are happy with 6000 for take off, What rpm do you cruise
at? Did you ever manage to get the monitor to record litres??
Neil.
Sent: Thursday,
December 12, 2013 9:33 AM
Subject: [FlyRotary]
Re: 2 cycle premix
Using a 74 x
88 2blade on my Renesis. I get about 6000 on takeoff so I would not
say you have too much prop. possibly too little if that 6800
rpm is accurate. 1800 EGT is not unusual at peak EGT
& WOT.
finally flying again, but my prop is too big. It is a 70” dia by 90 inch
pitch. Max revs on takeoff is about 6800 and the EGT is pushing
over the 1850 degrees. Obviously the prop is too big as revs are
restricted and the motor is working too hard hence the EGT. What
size props are you people running?? 2 rotor renesis.
Neil.
Sent: Thursday,
August 08, 2013 7:12 AM
Subject: [FlyRotary]
Re: 2 cycle premix
I use the
same mix, but at closer to 1 oz/gal. Why? That is what
Tracy
does. Dont think it is very critical over the short term. I
have gone without oil for a tank or two when I didn't plan well. I
have also put multi-weight aviation engine oil in (at .5 oz/gal) on one
occasion when I forgot to bring along any 2-stroke oil at
all.
On Fri, Jul
26, 2013 at 11:39 AM, Bill Bradburry <bbradburry@bellsouth.net>
wrote:
I use the same
mix as Dennis but at the rate of 3/4 oz/gal in non-ethanol auto
gas. My engine is a Renesis with 70 flight
hours.
Bill
B
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Clouduster
Sent: Friday, July 26, 2013 9:17 AM
To: Rotary motors in aircraft
Subject:
[FlyRotary] Re: 2 cycle premix
I use a 50 - 50 mix of MM and
WalMart 2 stroke @ 0.50 oz/ gal. Mixed in auto gas. My engine is a
Renesis with 500 +hrs.
Dennis H.
Sent from my
iPad
For those of
you who are actually flying and have some time on your rotaries and
are using Pre-mix 2 cycle oil:
1)
what oil are you using
3)
what ratios are you using
4
where is the best place to get it
--
David Leonard
Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
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