Thanks, Dave. . .that's good stuff! Interesting that 107 fps equates to 72.95 MPH.
Crude Rule of thumb: 2/3 FPS = MPH When I could run a 100 yard dash in 10 seconds (30 ft/sec), the coach said that was 20 MPH. ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, October 20, 2004 10:09 PM Subject: [RCSE] Zoom Time > <<In a message dated 10/20/2004 11:36:07 PM Central Daylight Time, > [EMAIL PROTECTED] writes: > Hey guys, you have provided a great deal of learned opinions about launch > and zoom technique, how to determine altitude, etc., but no one answered the > simple question: > > "How many seconds from release to leveling out?">> > > Originally posted to RCSE on 10/17/04. > > >From Flight Data Recorder: says it was about 4.5 sec (+/- 0.5 sec depending > on the wind, launch quality, etc.). It's about 1/3 of the total launch time. > This was not a full-size winch but the 1/3 factor is probably reasonably > scalable. Time was measured from the max velocity at the 'dip' to max > altitude/typical cruising speed. I timed a number of 3M ship, full bore launches at TNT > (including a few Icons). Total launch time is about the same probably due to > faster tow speed with more powerful winch system. > > Average of 9 launches. > Time on tow: 8.4 sec > Height on tow: 280 ft > Speed at release: 107 fps > Time in zoom: 4.4 sec > Height (zoom only): 107 ft > Final speed: 31.5 fps > Final height: 385 ft > Total launch + zoom time ~ 12.8 sec > > - Dave R > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
