Search found 2524 matches

by OverTheTop
Thu May 17, 2018 5:41 am
Forum: Scratch Built
Topic: Airframe choices (or why you should consider rolling your own airframes)
Replies: 20
Views: 866

Re: Airframe choices (or why you should consider rolling your own airframes)

Thanks for the info Drew. I think I need to try something other than West Systems for my future performance birds. I might seem picky, but the airframe would fail when the forces on the airframe exceed the strength of the airframe. That is normally before MaxQ, not exactly at it. MaxQ is just the po...
by OverTheTop
Wed May 16, 2018 4:42 am
Forum: How's the Weather..?
Topic: Image link
Replies: 7
Views: 147

Re: Image link

I am very averse to using external hosting sites for pics. I have had quite a few early posts essentially eliminated becuase of change in hosting policies of sites.

I usually just resize the image below the reqired 250kB and insert it for storage on the ausrocketry server.

YMMV.
by OverTheTop
Thu May 03, 2018 2:20 am
Forum: Mid/High Powered Rocketry
Topic: Don't Debate This, Too
Replies: 25
Views: 579

Re: Don't Debate This, Too

And when it "let go" it blew both the forward and rear closures clean off the motor casing. The casing itself "bell bottomed" on either end from the pressure and the closures shot out under high speed as a result. The cases are designed so that an overpressure event blows the en...
by OverTheTop
Wed May 02, 2018 3:23 am
Forum: Mid/High Powered Rocketry
Topic: Don't Debate This, Too
Replies: 25
Views: 579

Re: Don't Debate This, Too

However, in practice building, a composite pressure vessel that is also gas-tight is a totally different challenge. If the case only needs to withstand the forces and not be gas-tight at the motor pressure, that changes things drastically and for the better in terms of the construction. If you are ...
by OverTheTop
Sun Apr 29, 2018 5:24 am
Forum: Mid/High Powered Rocketry
Topic: Don't Debate This, Too
Replies: 25
Views: 579

Re: Don't Debate This, Too

Welcome back Mike! Hadn't heard from you for a while and I had wondered what you were up to.

Looks good so far. Looking forward to see where you get to.

Have you considered using tapered fins, thicker at the root and thinning towards the tip?
by OverTheTop
Thu Apr 19, 2018 9:54 am
Forum: Mid/High Powered Rocketry
Topic: Nike Apache Half-Scale Project
Replies: 83
Views: 11741

Re: Nike Apache Half-Scale Project

Thanks 03flyer. Looking forward to finishing and flying this one myself! Don’t know your itinerary and apart from the Tesla Museum... the Russian graveyards are the best. Italy, Mediterranean Sea (with stops in Italy, France, Spain), Naples (including Pompeii, Herculaneum and Mt Vesuvius), Croatia, ...
by OverTheTop
Sun Apr 15, 2018 10:36 am
Forum: Mid/High Powered Rocketry
Topic: Nike Apache Half-Scale Project
Replies: 83
Views: 11741

Re: Nike Apache Half-Scale Project

Have you thought about using the main sled as a circuit board to connect everything? Every time I do one of these I think the same thing! I think the outcome would be spectacular :) I do that sort of stuff for a day job, so my inclination to come home and do the same thing is not strong. Here is a ...
by OverTheTop
Sat Apr 14, 2018 9:08 pm
Forum: Mid/High Powered Rocketry
Topic: Nike Apache Half-Scale Project
Replies: 83
Views: 11741

Re: Nike Apache Half-Scale Project

Avionics Assembly I already have an avionics set for this rocket, but I am changing the Apache to the regular "skinny" payload bay. This is so I can get some more altitude out of it at Thunda next year :D . This necessitates a new set of electronics to fit into the 3" airframe. First...
by OverTheTop
Tue Apr 10, 2018 4:47 pm
Forum: Low Powered Rocketry
Topic: Question for L3 flyers
Replies: 4
Views: 211

Re: Question for L3 flyers

Back in about 2007 I build a Dynastar Orion from Apogee Components: dyna_orion03.jpg Lots of flights on D motors. Followed closely by a few from Sirius Rocketry, and then into HPR :D L3 is not that difficult, if you can research, and think, and work your way up at a rate that is appropriate for the ...
by OverTheTop
Tue Apr 10, 2018 4:33 pm
Forum: Support & Recovery & Misc.
Topic: EJECTION CHARGE!!??
Replies: 9
Views: 342

Re: EJECTION CHARGE!!??

How much BP? The right amount to do the job. Ground testing normally confirms the correct amount when using electronic ejection. Since you are BP limited you don't get that option easily. If you take the volume of the parachute compartment and get the numbers for diameter and length in inches (empty...
by OverTheTop
Tue Apr 03, 2018 1:08 pm
Forum: Rocketry Control Room
Topic: SpaceX CRS-14 Dragon Mission
Replies: 2
Views: 99

Re: SpaceX CRS-14 Dragon Mission

Autonomous Flight Termination Safety System is my guess. Used to be AFTS but they snuck an extra S in somewhere. Early versions were FTS (flight termination systems) which relied heavily on the RSO to terminate the flight, based on the data he was fed. The AFTS (or AFTSS) relies on pre-programmed no...
by OverTheTop
Mon Apr 02, 2018 6:32 pm
Forum: News & Events
Topic: Tiangong-1 space station reentry
Replies: 3
Views: 104

Re: Tiangong-1 space station reentry

Some fish have been impressed...

:D
by OverTheTop
Sun Apr 01, 2018 9:24 am
Forum: Mid/High Powered Rocketry
Topic: Southern Cross Rocketry - Engine RSE files
Replies: 3
Views: 184

Re: Southern Cross Rocketry - Engine RSE files

If you are just estimating altitude, use one of the other files (Estes or Aerotech) with similar Ns energy and average thrust and you are likely to get a good estimate. Accuracy of this will degrade the more you go towards supersonic.
by OverTheTop
Sat Mar 31, 2018 6:22 pm
Forum: News & Events
Topic: Parker Solar Probe
Replies: 7
Views: 194

Re: Parker Solar Probe

I remember that episode of Thunderbirds :D
by OverTheTop
Tue Mar 27, 2018 10:42 am
Forum: News & Events
Topic: Flat Earth
Replies: 4
Views: 137

Re: Flat Earth

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