Here is what the engine mount looks like.
To get this motor mount I had to make an additional centering ring
I made this centering ring out of thick poster
board, all I had to get the pattern was to lay one of the original centering rings on it
and traced its pattern, then I laid the other centering ring on it sideways and traced its
pattern to come up with what you see.
The next thing I had to do was to cut out the slots in the body tube for the motor mount
to slide in it. Two of the slots just followed the pattern the other two had to be moved
up 3/4 from the bottom of the body tube, and then extended to 4 in total
length to allow the engine tube to fit.
Here is what it looked like
Here is what it looks like after sliding the motor mount into the body.
And here is the final painted version of the
Basically after these few additions, everything else was built according to the
instructions the only extra parts I needed for this was an extra centering ring. And two
extra engine tubes cut long enough to be even with the other two.
I have flown this rocket several times with decent flights every time.
1st flight was on 4 A8-3, only 2 engines lit so it went off at a slight angle, but
recovery was good
2nd flight was on 4 B6-4, only 2 lit again but ok flight and recovery
3rd flight was on 4 B6-4, this time 3 lit and ok flight again
4th flight was on 4 C6-5, two engines lit, and rocket landed in a pond, the engines then
swelled in engine tubes, so I had to drill them out once it dried
I havent flown it since then because I need to fix one of the engine tubes, but I
plan on making a new clip-whip, so all 4 engines will light at once, it should do really