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Drogue Size Question
#1
Question for those who fly larger rockets.

Would you recommend a 30" or 36" drogue for a 60lb rocket recovery weight?  The chutes are Skyangle type.  I've used the 30" on a 30lb rocket and get a descent rate of about 50 ft/sec.  I calculated using Rocksim about 70-ish ft/sec for the 30" drogue on the 60lb rocket, maybe 60 ft/sec for the 36" drogue. 

Now (of course) I'm having doubts about which one to use.  

Any thoughts or experiences?


Don
NAR 98479 L3
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#2
I think either would be fine. I had a 3' Rocketman drogue on my L3 rocket which was ~65lbs recovered weight. Was not overly fast or slow on descent.
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#3
I use a 36 inch on my 70#. Like Tim's, it returns with a reasonable descent rate.
More than a few go drogueless, but I like to minimize the initial shock when the main opens.
I could just as easily reef the main/use a D bag and skip the drogue, but I am partial to drogues, when room allows...
Greg Young - L3
TRA 00234
NAR 42065
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#4
"Now (of course) I'm having doubts about which one to use"

Don, I'm just going with a Spherechutes Medium HD Drogue, it's about 18" equivalent, I considered going drogueless, but I at least wanted something to keep the pieces from possibly banging into each other.
Mine will weigh ~45lbs on the pad, and about 38 or so after motor burn out.
throw one in there and fly it, it will be fine. You did a great job on your build. I hope mine looks as good as yours when its painted!
Dave Greger L3
NAR# 95846
MDRA #65

Hollie L1
NAR# 99687
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#5
Thanks everyone for the good input.  I'll go with the 36", and report back on the descent rate after the flight.
NAR 98479 L3
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#6
I am sure it will be fine Don. It should descend rapidly enough to save you a walk depending on the winds aloft of course. Wink
Greg Young - L3
TRA 00234
NAR 42065
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#7
Size it according to what best suits your field from your expected altitude. While you may wince at 60 FPS, reasonable estimates for drift at that speed from whatever altitude you're expecting might land you in Jersey somewhere, necessitating a more rapid descent from apogee. I generally shoot for between 50 and 80 FPS. Some go slower, some a smidge faster. If there was room, I'd use a streamer. Far easier to track during descent.


Later!

--Coop
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#8
We are looking to have EXTREMELY HIGH winds at Higgs this weekend. You may want to consider drogueless.

Last time I launched in winds like this, my Scorpion (drogueless) went to 5500' and came down about 4250 feet away. My X-Celerator (with drogue) went to, perhaps, 9500', and I never found it.
John S.
NAR #96911
TRA #15253
MDRA
Level 1, 2014-Mar-15 -- Aerotech Sumo, H133BS
Level 2, 2014-Jun-21 -- Giant Leap Vertical Assault, J240RL
Level 3, 2016-03-12 -- MAC Performance Radial Flyer, M1101WH, 13,028 feet
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#9
(04-05-2016, 09:35 AM)Bat-mite Wrote: We are looking to have EXTREMELY HIGH winds at Higgs this weekend.  You may want to consider drogueless.

Last time I launched in winds like this, my Scorpion (drogueless) went to 5500' and came down about 4250 feet away.  My X-Celerator (with drogue) went to, perhaps, 9500', and I never found it.

I remember the flight of your X-Celerator.  Sorry to hear that you never found it, it had a neat paint job.

Good point about the drogueless.  Even though the flight should only go to 4000 ft, it might be better to forego one if the winds are up around 15 mph.  I'll look for a good window--remember last year the wind was really blowing on Saturday but Sunday was almost perfect.
NAR 98479 L3
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#10
Sunday is looking like the day. Unfortunately, it's the one day I won't be there.
John S.
NAR #96911
TRA #15253
MDRA
Level 1, 2014-Mar-15 -- Aerotech Sumo, H133BS
Level 2, 2014-Jun-21 -- Giant Leap Vertical Assault, J240RL
Level 3, 2016-03-12 -- MAC Performance Radial Flyer, M1101WH, 13,028 feet
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