How To Build RC Jet Turbine Exhaust Tubes
03-18-2014, 09:01 AM
#76
This is not an exact science since the length of your pipe will need to be taken into consideration. I would start with an ID of 3.5 - 3.75"
Andy
Andy
07-20-2014, 10:03 PM
#77
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I've founds some more info, so I thought I'd update this thread.
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
Last edited by ticketec; 07-20-2014 at 10:06 PM.
07-21-2014, 03:11 AM
#79
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Dave,
.007" (inch) is ballpark what to use. This equates to .1778 mm. You don't want to use .9 or 1.2 mm thickness.
John
.007" (inch) is ballpark what to use. This equates to .1778 mm. You don't want to use .9 or 1.2 mm thickness.
John
I've founds some more info, so I thought I'd update this thread.
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
07-21-2014, 03:18 AM
#80
The print does say .1 mm or .15mm thickness dependent on length so .17mm sounds right on.
Andy
Andy
I've founds some more info, so I thought I'd update this thread.
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
Here is a drawing that Wren sent to me a long time ago I re-found, but it give various dimensions for a augmenting type thrust tube that will produce more thrust. The missing dimension is the opening of the thrust tube at the turbine end and this is 61mm for the Wren 54/70/75. I would hazard a guess and say that for the larger pipes, they ratio of turbine end opening to constant taper tube diameter would remain roughly the same as for the 54/70/75 tubes
I have also found a supplier of stainless sheet in Queensland. the sheets come in 1200x2400mm sheets, and they will cut it down if you don't want the whole sheet, so 1/2 the sheet will be 1/2 the cost.
I've just got of the phone with them so their prices as follows:
http://www.mastercut.com.au/products/shim.aspx
Thickness type cost
0.9mm
304 $250
316 $250
1.2mm
304 $275
316 $300
Thanks
Dave
07-21-2014, 07:00 AM
#81
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I found myself needing a 3 1/4 Bell mouth. As someone mentioned earlier on in this thread... Many products are already available for other purposes.
Here's my new SS bell mouth
Here's my new SS bell mouth
Last edited by Vettster; 07-25-2014 at 09:35 AM.
07-21-2014, 08:05 AM
#82
Wow great link.. I just bought one. This looks good for any size pipe..
I found myself needing a 3 1/4 Bell mouth. As someone mentioned earlier on in this thread... Many products are already available for other purposes.
Here's my new SS bell mouth
http://www.greenfromthegarden.com/ho...canning-funnel
Here's my new SS bell mouth
http://www.greenfromthegarden.com/ho...canning-funnel
07-25-2014, 09:42 AM
#84
Thanks I will get right on this.. If you have any other links let me know... I need a bell mouth for a pipe I am making.
Andy
Andy
Hey afioretti
you better ask for a refund. The owner just called me to let me know they are no longer in business. I asked for a refund and she said she would.
07-25-2014, 10:04 AM
#85
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Just Google Stainless steel Canning Funnel with 3 1/4" neck. Something will show up. Im having a hell of a time finding a company that will ship to Canada and not use thouse *$#((% thief's called UPS
07-25-2014, 10:27 AM
#86
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Here's a place that has them. But they dont ship to Canada. Care to order 2 and ship me one via USPS?
http://www.canningsupplyhouse.com/ca...ng-funnel.html
http://www.canningsupplyhouse.com/ca...ng-funnel.html
07-25-2014, 07:56 PM
#89
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My Bad on the material thickness I had quoted
I had the chart and everything!
Nice find on the bell mouth. I searched and found these options for us Aussies,
http://www.kitchenwaredirect.com.au/...ade-Jam-Funnel
http://www.ebay.com.au/itm/Jam-Funne...4dd1764&_uhb=1
Thanks
dave
I'm getting ready for an event this coming weekend, so hopefully when I get back I can buy some materials and have a crack at it.
Thanks
Dave
I had the chart and everything!
Nice find on the bell mouth. I searched and found these options for us Aussies,
http://www.kitchenwaredirect.com.au/...ade-Jam-Funnel
http://www.ebay.com.au/itm/Jam-Funne...4dd1764&_uhb=1
Thanks
dave
I'm getting ready for an event this coming weekend, so hopefully when I get back I can buy some materials and have a crack at it.
Thanks
Dave
07-26-2014, 04:38 AM
#90
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Guys.. you need to make sure the bottom hole(neck) of the funnel is the correct size. Many are only 2 1/4 dia. For me.. Im searching for a bottom hole of 3 1/4.
Check the dimensions before ordering
Check the dimensions before ordering
07-26-2014, 10:07 AM
#91
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It was me that did the testing and published in RCJI. The effects of the augmentation principles work equally well on all sizes of our engines running from the Lambert size up to P200 size. The great thing is that the augmentation sucks in a large amount of cool air together with the hot gasses. This cool air runs down the pipe against the wall and keeps it cool. If you are careful and do not have hot starts it is possible to keep a single walled pipe from going any hotter than a straw colour. I did some work on bifurcated pipes and managed to make one that had almost no loss. Most standard straight pipes have a significant measurable loss and bifurcated ones can be much worse.
John
John
A request....could you make a PDF of your article and post it or PM a few of us that request it?
thanks
Dave Kachorowski
