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Thursday, March 29, 2012
Ranger Clone Build Part 1 Parts
On the left is how the Ranger looked in the 1968 Estes Catalog.
Inset on the right is the Ranger shown in the 1971 catalog. This build will have the 1971 paint scheme.
Here's the parts for the build:
Originally I wanted to build the Ranger from a Baby Bertha kit. The fins are very close. But, I did cut 1/8" thick fins from the Ranger plans from JimZs - HERE
The Baby Bertha body tube is 7 1/2" long. Cut that down to 7" and you would only have to add a 11" length of BT-60 for the lower tube.
That and some BT-20 for the three engine cluster tubes, a 60 sized balsa nose block and you are good to go!
I'm upgrading a few things from the original Ranger parts.
The 3X 18mm engine mount assembly is from jonrocket.com. This build will add three engine hooks. Friction fitting a three engine cluster into thin BT-20 tubes could be a problem. A modified plywood 50/60 centering ring is added to the top of the engine mount to prevent the ejection charge from exiting out the back. While the picture shows a plywood ring with three holes, I'll show how to make a ejection blocking ring from a more common single hole plywood 50/60 centering ring.
In the parts picture there is what looks like a baffle plate. I'll be ordering the equivalent Semroc part, #EBR-60W.
This single punched disk keeps the parachutes higher up in the lower mainframe tube during boost. It also adds a elastic shock cord connection point. It is not a full baffle assembly and wadding is still required.
Newer Estes parachutes will be used, they have a good vintage look to them.
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