Today's Message Index:
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1. 08:53 AM - Looking for an impulse mag (Stewart, Michael (ISS Atlanta))
2. 06:16 PM - canopy bow drag (Larry James)
3. 07:19 PM - Re: canopy bow drag (u2nelson)
Message 1
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| Subject: | Looking for an impulse mag |
--> Rocket-List message posted by: "Stewart, Michael (ISS Atlanta)" <mstewart@iss.net>
Looking to buy a used mag and harness from one of you who has put in
electronic ignition on your Rocket for a 540 engine.
Would like an impulse mag and harness.
Please contact me off list.
Thanks
Mike
Do not archive.
Message 2
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"Rocket List" <rocket-list@matronics.com>
--> Rocket-List message posted by: "Larry James" <larry@ncproto.com>
Hi All,
I'm still deciding between a tip-over and slider canopy. I was discussing
this with a fellow builder this past week, and he offered that he'd seen
some fluid dynamic data that showed the very crest of the canopy to be one
of the highest pressure areas of the airframe; and therefore any
discontinuity in this area would be very draggy. If this is true, another
point against a slider. Anyone with some experience with this ??
Larry E. James
Bellevue, WA Harmon Rocket II fuselage/systems
Message 3
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--> Rocket-List message posted by: "u2nelson" <u2nelson@prodigy.net>
Actually this is one of the lowest pressure areas, but you are correct that
any disturbance there would be bad. I have a slider and I went out of my
way to keep the bump as small as possible, to keep the potential drag
penalty low. I believe I succeeded, as my rocket is one of the fastest out
there. Check out the Reno race results, compare with the other rockets,
just a tad behind John and the impressive HRIII, and better than the other
HRIIs with flip overs.
I think the choice really comes down to better visibility (only marginally)
vrs hanging your arm over the edge on a hot day. The slider is really a nice
addition IMOP for ground operations.
Greg Nelson
N144X
-----Original Message-----
From: owner-rocket-list-server@matronics.com
[mailto:owner-rocket-list-server@matronics.com]On Behalf Of Larry James
Subject: Rocket-List: canopy bow drag
--> Rocket-List message posted by: "Larry James" <larry@ncproto.com>
Hi All,
I'm still deciding between a tip-over and slider canopy. I was discussing
this with a fellow builder this past week, and he offered that he'd seen
some fluid dynamic data that showed the very crest of the canopy to be one
of the highest pressure areas of the airframe; and therefore any
discontinuity in this area would be very draggy. If this is true, another
point against a slider. Anyone with some experience with this ??
Larry E. James
Bellevue, WA Harmon Rocket II fuselage/systems
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