I bought a load of rockets the other week, as non of the rockets came with the boxes or info I was wondering how (if there is) to work out what motors they are made for?
Does it matter as long as they fit?
What Motor
Started by mort25, Feb 29 2008 09:10 PM
6 replies to this topic
#2
BigG
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Posted 29 February 2008 - 09:38 PM
I bought a load of rockets the other week, as non of the rockets came with the boxes or info I was wondering how (if there is) to work out what motors they are made for?
Does it matter as long as they fit?
Motors for rocketry come with Thurst information on the motor. It most of the time will say something like A8-3 (Letter Number - Number). And no - you can not just "put them in in they fit".
Post the numbers, we will refer you to the right location to look for the info.
#3
mort25
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Posted 29 February 2008 - 09:47 PM
Motors for rocketry come with Thurst information on the motor. It most of the time will say something like A8-3 (Letter Number - Number). And no - you can not just "put them in in they fit".
Post the numbers, we will refer you to the right location to look for the info.
I dont have any information about the rockets really I was wondering if there was some sort of way of working out what motors can be used?
#4
BigG
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Posted 29 February 2008 - 09:47 PM
Sorry - I misread your quesiton.I dont have any information about the rockets really I was wondering if there was some sort of way of working out what motors can be used?
Generally - it's not just a question of fit. Some rockets will require a starting thrust which is higher in order to lift them up at all. Others require shorter or longer delay - if you release your recovery device when the rocket still move forward at very high speed - it can just tear it apart.
The sure way to do this is to run a simulation on Rocksim/SpaceCad. While not 100% accurate - it will predict which motors are better for the rocket.
#5
mort25
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Posted 29 February 2008 - 09:50 PM
Sorry - I misread your quesiton.
Generally - it's not just a question of fit. Some rockets will require a starting thrust which is higher in order to lift them up at all. Others require shorter or longer delay - if you release your recovery device when the rocket still move forward at very high speed - it can just tear it apart.
The sure way to do this is to run a simulation on Rocksim/SpaceCad. While not 100% accurate - it will predict which motors are better for the rocket.
Nice one thank you I will have a look at those!
#6
Daedalus
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Me, I only do Cat. 3
Posted 29 February 2008 - 10:19 PM
Nice one thank you I will have a look at those!
The best bet is probably WRASP as it is free - it will give you an idea of performance and only requires the rocket weight and diameter and then try different motors and check the performance. Rocksim or Spacecad cost - they have more functionality but you probably don't need that yet.
Dave
#7
Gillard
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gillard
Posted 01 March 2008 - 09:05 AM
I bought a load of rockets the other week, as non of the rockets came with the boxes or info I was wondering how (if there is) to work out what motors they are made for?
Does it matter as long as they fit?
Yes it's really important to get the right motor for the rocket, a rocket designed for a C6-3 will not perform well on a C6-7 as the delay is too long, and it won't get off the pad on a 1/2A6-3
If you know the name of the rocket, then it's quite easy
go look at the american website EMRR - google it and you'll find it.
Then type in the name of the rocket in the search function, and then lots of reviews and tips and more importantly recommended motors will pop up.
this is how i found out about your impulse rocket.
feel free to mail me if you have any questions about rocketry -or better still join a club.
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