The swing test is only valid if the rocket is fully loaded with motor and payload, recovery geat, etc. Everything set for lift-off, with the swing string positioned at the measured balance point (Cg)...
Type: Posts; User: bobkrech
The swing test is only valid if the rocket is fully loaded with motor and payload, recovery geat, etc. Everything set for lift-off, with the swing string positioned at the measured balance point (Cg)...
Have a safe trip home Mark.
Bob
The planes were under ATC control on a diversion route around a thunder storm. I'm sure ATC had them maintaining the require terminal area separation which is 3 miles horizontal within 60 miles of...
Not quite. DC-10 3-man cockpit, MD-11, 2-man glass cockpit.
Boeing MD-10 2-man glass cockpit upgrade to older DC-10 permits common MD-10/MD-11 type rating for FedEx and other to permit a common...
As of May 15, 2013 FedEX is flying 63 DC-10s, and 64 MD-11s, just over 1/3 of their fleet of 376 planes.
What I find amazing is that they are still flying 17 727s!
...
We have our ultimate faith in our fearless leader, president for life!!!!!!!!!!
Bob
The HHR has a fold-flat split rear seat with a hard plastic backing, and the front passenger seat also fold down so you can get a lot of N-S space. Interiior cargo space is good with the rear seat...
The FAA Class 1 limit is a maximum 125 g propellant weight in a rocket weighing not more than 1500 g. Any rocket with more propellant or with more weight needs written FAA approval before launching...
I missed the 2 grain part of the G33 but with each grain weighing 35 grams, they still have to ship hazmat.
If you go back through this forum, you will see lots of complaints about hazmat fees on...
Ya, but today's copy machines are far better. In grade school we used to get out of date advertising copy printed one side but clear on the other work classroom use.
Bob
I bought a 2009 HHR LS thanks to cash for clunkers several years after I rented one on a business trip to Albuquerque. I took the rental car down back side of Sandia mountain on a dirt fireroad, and...
That will also work as well, and will also wet well as it has a low viscosity. It gives up a little in long term temperature stability, but aerodynamic heating is not long term, so 4460 and 4461 may...
MSDS wouldn't have the shelf life of the product. I'd call or e-mail Cotronics for the info, but I'm guessing it's pretty good, probably at least 2 years. BTW - The link to the datasheet with the...
I doubt it will happen because the DOT shipping regulations have not changed.
The current G53 is a 2-grain, 60 g total propellant weight reload that is mailable via USPS parcel post without any...
Look at the attached spreadsheet to see what the shock loads will be for a given deployment scenerio. If you input your rocket weigh, and the 2 chute sizes, you can determine the shock load of a...
The Cotronics 600 F laminating epoxy resin is the real deal, and is the easiest high temperature epoxy resin to obtain.
Duralco™ 4460 for layups. http://www.cotronics.com/vo/cotr/ea_ultratemp.htm...
Everyone needs to review NFPA 1122-2013, 1125-2013 and 1127-2013 as there are a few significant changes in the rules.
The 62.5 gram limit is a Federal Exemption limit for the generic low...
CD systems are not necessarily heavier than a DC system as the wire gauge is usually smaller, think shooters wire verses extension cords, for long cable runs where IR losses can be high unless you...
Aaron,it looks great. Simple, compact and easy to use.
Just one added comment. Since the battery pack is external and heavy, consider getting some self-adhesive hook and look fastener strips to...
The videos previously shown are from http://www.kurzzeit.com/eng/startseite.htm Literal translation "short time". Kurzzeit makes bullet velocity measuring systems and sell the Shimadzu HPV-1 High...
It is the convention used by the entire professional aerospace industry......
Bob
A delay o-ring in a 29 mm reload kit is worth $0.10. You rocket is worth several hundred times more. It's not a good idea to risk a rocket by reusing a $0.10 o-ring as the parts included in a...
For example, this 180 maH 3S1P LiPo pack from Hobby King is the smallest COTS battery they list and it weighs in at 19 grams with the connectors and wiring.
A fully charged 3S1P LiPo pack would...
The lowest deployment velocity is V deployment = g x delta t where g = 32 ft per second per second multiplied by the time before or after apogee in seconds.
The maximum safe deploy velocity...
Paul
You can post a link to outside references.
Bob Darhlquist was a great guy and rocket man who died too young. You can download his igniter paper here. ...
You're confusing something. The force required to shear (3) 2-56 nylon screws is 65 pounds = ~5 psi in your rocket. The force required to shear (3) 4-40 shear screws is 115 pounds = ~10 psi. ...
No. That's not what Adrian is saying.
What the battery pack is rated for, and what it will put out on a short, are 2 different things. The ratings are for what the battery pack will source...
The 180 maH 3s battery pack is the proper choice for both single and dual battery setups.
This altimeter draws 65 ma, so you have just under 3 hours of run time on the 180 maH battery pack. Most...
Alex
Read the papers again. The temperatures recorded are the surface temperatures, not the gas temperatures. The parameter being measure is the heat being transfered from the gas to the NC...
Elihunter
We are not discussing model rockets here. Model rockets have no more than 125 grams of propellant (< 240 Ns total impulse) and weigh not more than 1500 grams. Model rockets do not go...