---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Mon 01/10/05: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 08:53:25 AM PST US Subject: Rocket-List: Looking for an impulse mag From: "Stewart, Michael (ISS Atlanta)" --> Rocket-List message posted by: "Stewart, Michael (ISS Atlanta)" 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 _____________________________________ Time: 06:16:48 PM PST US From: "Larry James" "Rocket List" Subject: Rocket-List: canopy bow drag --> Rocket-List message posted by: "Larry James" 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 _____________________________________ Time: 07:19:09 PM PST US From: "u2nelson" Subject: RE: Rocket-List: canopy bow drag --> Rocket-List message posted by: "u2nelson" 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" 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