John I have a few questions for you on your corvair. The warb drive prop,
how hard it is to change the pitch? You mentioned that you didnt have spats,
you refering to wheel pants? Your strait pipes sticking out has to be a big
drag factor as I read in my Custom Planes magazine.
If you would have went with the rear started woudl you have avoided the
bump in the cowling? Im getting ready to make my wooden firefall portion
and consiter raising the top deck just a tad to allow a nice streamline cowl
rather then bumps.
Did you happen to weigh your engine fire wall forward. Whats the empty
weight?
Justin
KR2S
----- Original Message -----
From: "John and Janet Martindale" <johnj...@chc.net.au>
To: "KRnet" <kr...@mylist.net>; "CorvAircraft" <corvaircr...@mylist.net>
Sent: Tuesday, June 17, 2003 6:52 PM
Subject: KR>Performance
Folks
Several people have asked what performance I am getting with the 2700cc
Corvair in my KR2.
With the 3 blade 56" dia Warp Drive set at 23 degrees pitch I see about 150
knots (173mph) at 3000rpm in level cruise and gross weight (1200lbs).
However the engine won't wind up to the rpm band I would prefer
(3800-4000rpm). SOS at 56" dia is about 4600rpm which coincides with about
the max performance that can be got out of the OT10 cam.
I'll be trying with a finer pitch shortly. Also yet to put on 5.00x5 spats
(big drag at present). Hoping to tweak up to at least 160 knots (RR redline
is 173 knots - 200mph).
Does anyone know if there are limits on Warp Drive rpm other than tip speed,
eg., on centripetal force at the hub or blade collars??
John and Janet Martindale
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA
ph: 61 2 6658 4767
email: johnj...@chc.net.au_______________________________________________
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