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-   -   Question in regards to Ejection Baffles. (http://www.oldrocketforum.com/showthread.php?t=13420)

dvmanning 01-17-2014 09:07 PM

Question in regards to Ejection Baffles.
 
Having never used an Ejection baffle, is it practical to use a baffle in the BT-50 tube, .095 inch I.D. or are the baffles designed more for the larger tubes? Are the sizes in millimeters, as I have seen described as a Series 13, 14, 19 etc. The BT-60 has an inside diameter of 40.52 mm or 1.595 inches 1.6 inches.. What baffles would I order for the BT-50 or the BT-60 tubes, if I decide to use the baffles in the construction of the future models. :)

BEC 01-17-2014 10:16 PM

My favorites for BT-55 and up are the conical ones from Semroc on this page: http://www.semroc.com/Store/scripts...p?idCategory=68

I have seen some baffles from other vendors for BT-50 but don't have any experience with any of them.

tbzep 01-17-2014 10:41 PM

I have used 1/2 moon baffles in BT-20. They are actually in motor mounts of short rockets that don't have room for wadding and chute. They work great, but the rockets have low flight numbers so I don't know how many flights they will last. I suspect less than 50 flights before they burn out.

dvmanning 01-18-2014 07:01 AM

I guess my question should be "How are they sized for the smaller ones? Here is an example on SEMROC, (Featherweight laser-cut fiber ejection baffle ring for #16 tubes. ) What is the #tube that I need for the BT50 tube. I get the sizing for the BT-55, BT-60, BT70, etc.
The Estes Vagabond has the BT-60 tube, so the EBR-60W Baffle will work since it has the 1/4 inch elastic cord. This is the main one I am considering to install the Cone shaped ejection baffle in. Thanks for the link to Semroc , but I'm quite familiar with the website, since all of my components have been purchased from them. over the past two years.

hcmbanjo 01-18-2014 09:28 AM

Here you go!

BT-50 Baffles and above:
http://www.jonrocket.com/index.php?...ndex&cPath=9_36

BT-20 baffles and above:
http://www.unclemikesrocketshack.co...mex_Baffle.html
Scroll down to the "Baffles Made From Letramax"

tbzep 01-18-2014 09:53 AM

Quote:
Originally Posted by dvmanning
What is the #tube that I need for the BT50 tube.

If you are making a home made baffle for a BT50 tube, use a BT50 size tube coupler. Estes/Semroc designation is JT-50C. Balsa Machining Service carries that size tube in 1", 4", and 34" lengths, C50-1, C50-4, C50-34.

dvmanning 01-18-2014 10:30 AM

Thanks, for the great information.

dvmanning 01-18-2014 10:31 AM

Thanks, for the websites. I can use these later.

Joe Wooten 01-18-2014 12:04 PM

I don't remember who made them, probably SEMROC, but I have used the BT50 baffles with good success. ABout 20 flights on both of them so far.

BEC 01-18-2014 12:38 PM

Quote:
Originally Posted by dvmanning
I guess my question should be "How are they sized for the smaller ones? Here is an example on SEMROC, (Featherweight laser-cut fiber ejection baffle ring for #16 tubes. ) What is the #tube that I need for the BT50 tube. I get the sizing for the BT-55, BT-60, BT70, etc.
The Estes Vagabond has the BT-60 tube, so the EBR-60W Baffle will work since it has the 1/4 inch elastic cord. This is the main one I am considering to install the Cone shaped ejection baffle in. Thanks for the link to Semroc , but I'm quite familiar with the website, since all of my components have been purchased from them. over the past two years.


Sorry - I should've caught your SAM number in your post and realized that you were already familiar with Semroc stuff.....

Semroc doesn't have baffles for smaller than BT-55. If they did I'd expect they'd be so marked (though one for ST-9 would also work, if it existed, since it has the same ID).

Others have provided some good alternatives.

FWIW - I use the Semroc EB-60 in all my BT-60-based birds including my Vagabond.


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