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If you are even thinking of modifying an Estes D Region Tomahawk (2037) to a 29mm motor, you need to read this!
I've found that the Wendy's TruMoo milk bottle (found typically in kid's meals) is a PERFECT match for the Estes 29mm Motor Tube (031360). It slips into the retention rings/ridges (inside the fin body halves (part no. 61743) that hold the motor tube in place without any issues at all. With the back "bulkhead" removed, the milk bottle's lid can fit inside the fin body, thus recessing it slightly. With a motor in place the rocket would sit on the nozzle however without the motor, the rocket will almost sit on the fins (it rocks slightly, but the fins do prevent it from tipping over). I removed my own rocket's upper bulkhead. I could have kept it, but I am going to use a 2nd milk bottle's neck to create another bulkhead and not have to worry about all the hassle of widening the hole for the motor tube.
[EDIT] By using two milk bottle's necks, you can move the rear bottle neck to above the fin body's retention rings/ridges (sandwiching them), and still manage to hold the motor tube securely, recessing the neck even further inside the fin can. Thus, with the lid removed (you can store it inside the rocket) eliminating the rocking issue noted below. In the photos below, the one on the left has the bottle's neck secured inside the retention rings, and the one on the right is sandwiched over them.[/EDIT]
Here's a photo that shows the two side by side.
I'd say that this recesses the cap about 2mm, and makes the difference on whether or not the rocket can sit on its fins (and not rock) when a motor isn't installed.
You will need to remove the top 5mm of the neck of the bottle to get an Estes Pro Series II F26-6FJ motor to fit, but there is a convenient ridge that helps you align your razor saw when cutting it off.
I've found that the Wendy's TruMoo milk bottle (found typically in kid's meals) is a PERFECT match for the Estes 29mm Motor Tube (031360). It slips into the retention rings/ridges (inside the fin body halves (part no. 61743) that hold the motor tube in place without any issues at all. With the back "bulkhead" removed, the milk bottle's lid can fit inside the fin body, thus recessing it slightly. With a motor in place the rocket would sit on the nozzle however without the motor, the rocket will almost sit on the fins (it rocks slightly, but the fins do prevent it from tipping over). I removed my own rocket's upper bulkhead. I could have kept it, but I am going to use a 2nd milk bottle's neck to create another bulkhead and not have to worry about all the hassle of widening the hole for the motor tube.
[EDIT] By using two milk bottle's necks, you can move the rear bottle neck to above the fin body's retention rings/ridges (sandwiching them), and still manage to hold the motor tube securely, recessing the neck even further inside the fin can. Thus, with the lid removed (you can store it inside the rocket) eliminating the rocking issue noted below. In the photos below, the one on the left has the bottle's neck secured inside the retention rings, and the one on the right is sandwiched over them.[/EDIT]
Here's a photo that shows the two side by side.
I'd say that this recesses the cap about 2mm, and makes the difference on whether or not the rocket can sit on its fins (and not rock) when a motor isn't installed.
You will need to remove the top 5mm of the neck of the bottle to get an Estes Pro Series II F26-6FJ motor to fit, but there is a convenient ridge that helps you align your razor saw when cutting it off.
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