I looked into the Mazda 13b with a PSRU... the end weight was about 350 lbs
or more.
Can the KR2 airframe handle that kind of weight hanging off the front?.. or
the pull of 200HP?
-Jeff Wilder
CISSP,CCE,C/EH
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>From: "Colin Rainey" <[email protected]>
>Reply-To: KRnet <[email protected]>
>To: "KRnet" <[email protected]>
>Subject: KR> Speed vs. HP
>Date: Fri, 16 Mar 2007 01:14:40 -0400
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>
>"You will probably see 250 mph with pants and 200 hp"
>
>It doesn't work like that in the air, like adding HP to a car and expecting
>speed increases. Mark's climb rate will definitely get a BIG jump, possibly
>the best in the bunch so far, if he can match a prop to it. But increasing
>HP does little to increase cruise or top speed after a point, especially
>for
>planes flying at or near 200 mph and up.
>
>Back a few months ago we discussed this at length, and all who have studied
>on this have agreed; more is gained by drag reduction than HP increase. To
>double the speed, drag is increased by 4 times. To get 250 mph from a KR2S,
>one needs to lose the front wheel, or work very hard on a completely
>aerodynamically faired leg, not just a cover, and the same holds true for
>the mains, and their legs. Now anything sticking out in the breeze becomes
>important; so that round strobe Mark has will have an impact at these
>speeds; any antennae should have a fairing, not just be left round; wing
>root fairings need special attention due to this area relating heavily to
>the highest lift area on the wing so also potentially the highest drag
>area;
>cowl flap(s) become a consideration to reduce drag; greater rake to the
>vertical stab, etc...
>
>"Speed with Economy" is definitely the bible here...
>
>There are a lot of pluses to using the Mazda 13B in aircraft with firewalls
>designed for their weight. But without alot of reinforcing, similar to the
>refit rebuild that the KR360 got, I think the Mazda is too heavy, and high
>output. Better to use a different engine with slightly less HP but just as
>much torque after the re-drive and stay with what your firewall/airframe
>can
>handle...
>
>JMHO...
>
>Colin Rainey
>[email protected]
>N96TA
>
>
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