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Old Oct 15, 2014, 02:13 PM
Post Captian
qwerty_2008's Avatar
United States, CA, El Mirage
Joined Sep 2013
132 Posts
Question
RPG7 hobby rocket?

Lately I have been thinking of making a rocket launcher hobby rocket and after going through several different possibilities ranging from the classic Bazooka to the modern Javelin I have settled on the RPG7. Though I don't currently have the money to start on this project I would like to know if it would be possible legally to make a rocket that looks like a fairly infamous weapon? and if not would it be OK to make a miniature version? or do you guys think that I should stick to what I know which is wood.
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Old Oct 20, 2014, 02:33 PM
SPOOOOOOON!
Joined Oct 2006
354 Posts
Quote:
Originally Posted by qwerty_2008 View Post
Lately I have been thinking of making a rocket launcher hobby rocket and after going through several different possibilities ranging from the classic Bazooka to the modern Javelin I have settled on the RPG7. Though I don't currently have the money to start on this project I would like to know if it would be possible legally to make a rocket that looks like a fairly infamous weapon? and if not would it be OK to make a miniature version? or do you guys think that I should stick to what I know which is wood.
Making a model of an RPG is no issue, there are lots of models of missiles that get flown all the time.

There are safety code issues if you want to launch it from a shoulder mounted launcher, though.

kj
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Old Oct 27, 2014, 01:16 PM
Post Captian
qwerty_2008's Avatar
United States, CA, El Mirage
Joined Sep 2013
132 Posts
Thanks kj.
I was also wondering if there is a chart on motor sizes to show the dimensions and how heavy a rocket they can push, I have found information on their trust in newtons but I have no idea what that equates to in how much they can effectively lift. Thank you.


Lextin.
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Old Nov 06, 2014, 10:45 AM
SPOOOOOOON!
Joined Oct 2006
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Check out http://www.thrustcurve.org/searchpage.jsp for information on just about all commercially available motors.

For a rough calculation, it takes about 4 newtons to lift a pound. If you take a look at the site above, you can see an impulse chart for each motor. Pay attention to the initial thrust spike. As a general rule, that should be 4-5x the weight of your rocket for safe liftoff.

Once you get into the H impulse range, you need a certification from the NAR or TRA to buy the motors.

kj

Quote:
Originally Posted by qwerty_2008 View Post
Thanks kj.
I was also wondering if there is a chart on motor sizes to show the dimensions and how heavy a rocket they can push, I have found information on their trust in newtons but I have no idea what that equates to in how much they can effectively lift. Thank you.


Lextin.
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