Aerotech Delay Help

[bcdlr]

I know you can 'drill' out a delay element to shorten the delay time but can you just substitue other delay elements of appropriate lengths?

In my case I'm planning on using a J420R - according to RockSim a 12 second delay would be near ideal for my rocket. Here are the delays listed for a J420R:
S 0.406" RDK-09
M 0.531" RDK-17
L 0.656" RDK-14

A RDK-12 delay element is 0.594" long - which just "happens" to be half way in between these two.

Will this work?
Can you just find a different delay of the appropriate length this way (given the delay material and diameter / tube material are appropriate)?

Sorry for the post. I tried searching but didn't come up with anything definitive and I've poured over the Aerotech documentation and couldn't come up with anything.
Must be rocket science huh??

 

[rdbones]

If you are familar with the CTI adjustable Delay system or have a Pro38 delay adjustment tool, you can buy an aerotech adaptor for it and set the delay that you desire.

Whats Up Hobbies has both of them available

 

[als57]

It would probably work if the burn rate of the 2 delays was the same. I have no info on that. Drilling the delays does work and I have done it many times.



Al

 

[MarkM]

Originally posted by bcdlr
I know you can 'drill' out a delay element to shorten the delay time but can you just substitue other delay elements of appropriate lengths?

In my case I'm planning on using a J420R - according to RockSim a 12 second delay would be near ideal for my rocket. Here are the delays listed for a J420R:
S 0.406" RDK-09
M 0.531" RDK-17
L 0.656" RDK-14

A RDK-12 delay element is 0.594" long - which just "happens" to be half way in between these two.

Will this work?

According a nifty table I found online, that's the right RDK for a 12 second delay on a J420R. So go for it!

Can't remember where I found this. I think it's been posted on TRF before, but this is a great table for cross-referencing & changing RDK delays to the appropriate timing for AT RMS

 

[bcdlr]

Mark, thanks that's great!

Guess what though? I was told to try WinRoc to verify my altitudes, etc.
So, I did. There is a heck of a difference between WinRoc and RockSim 5.x

So, I tried wRASP. It came out with very similar results to WinRoc. Very similar results.

Nonetheless this is handy information and I will definitely hang on to this.

Back to work to figure out what this is really going to do!

 

[loopy]

In my experience, Wrasp tends to be closer to the truth in delay times. YMMV.