Smaller motors in minimum diameter rockets

[RocketGeekInFL]

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.

 

[watermelonman]

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

 

[Titan II]

https://shop.locprecision.com/produ...EA5.m1plqscsfapp03?productId=82&categoryId=25

 

[Bat-mite]

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?

 

[RocketGeekInFL]

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

 

[Bat-mite]

https://giantleaprocketry.com/produ...rs.aspx#Motor_Adapters_for_Slimline_Retainers

 

[RocketGeekInFL]

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.

 

[dixontj93060]

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.

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.

 

[RocketGeekInFL]

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.

 

[Buckeye]

https://www.aeropack.net/webstore/products.asp?groupid=10

 

[dixontj93060]

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.

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.

 

[Buckeye]

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.

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!

 

[RocketGeekInFL]

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.