Smaller motors in minimum diameter rockets

I was wondering if anyone had any thoughts on doing a smaller motor in a minimum diameter rocket yet leaving the rocket able to fly its intended motor diameter? I have a 38mm min diameter and I want to fly it with 38mm on larger fields, however since my home field is much smaller I want to fly it with 29MM motors.

Take a look at how the Aeropack 75/54 adaptor works, might want to try out some rings like that.

I've never done minD, but I can't see how that matters. If you can make the motor fit (adapter) and if it has enough initial thrust to get it off the rail, then why not?

I should mention I would prefer to not use friction fit.

I was thinking of slim lines and this is one of the recommended options for this particular kit a Mariah 38, but I would prefer to not have anything creating drag and would also not look forward to doing some sort of build up on the front end of the retainer. I was thinking of using the 38 to 29 tailcone they have, but still have an issue of how to hold the motor in.

RocketGeekInFL said:

I was thinking of slim lines and this is one of the recommended options for this particular kit a Mariah 38, but I would prefer to not have anything creating drag and would also not look forward to doing some sort of build up on the front end of the retainer. I was thinking of using the 38 to 29 tailcone they have, but still have an issue of how to hold the motor in.

Click to expand...

With a bit of finishing work you can remove the drag on a MD rocket utilizing a Slimline retainer. Note the "in process" and "finished" pictures my Madcow Tomach below.

That is impressive, you can barely tell it is there. How did you do the build up for that? I imagine a lot of sanding was involved.

RocketGeekInFL said:

That is impressive, you can barely tell it is there. How did you do the build up for that? I imagine a lot of sanding was involved.

Click to expand...

Actually not that hard. Here is another example:



Just use SuperFil. If you browse through this thread you will see interspersed the steps used in building the above.

dixontj93060 said:

Actually not that hard. Here is another example:

View attachment 274618

Just use SuperFil. If you browse through this thread you will see interspersed the steps used in building the above.

Click to expand...

I really like what you did. However, I hate all forms of finishing - sanding, filling, painting - so I probably won't put in the effort!

Well I think I have settled on a plan. I am going to use an Aeropack Minimum diameter retainer, with rods and casings using RAS, and then I will use 120-240 motors in a 360-480 casing on smaller fields. Will have to pay more for a G reload, but in the long run it will work out cheaper than trying something else, and will also be more reliable and less chance of loss. Now if I can just keep it out of the nearby lake that has ceremoniously been named after me all will be well.