Freewing A-10 1.7M Turbine Conversion 2 x P20-SX
12-17-2017, 01:12 PM
#51
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The A-10 has sold tons and is one of FWs most popular EDF jets, so I would assume there could be a decent market for this.
12-18-2017, 10:17 AM
#54
I might do a kit. If anyone want to bounce a kit via me I can make the conversion kit and then forward airframe. Would cost quite a bit in shipping though. Option 2, wait until I do my own A10, which I can not promise when.
I can also supply CAD services if given good sketches aka photos with a ruler included for size. "We" as in my LHS or the Swedish jet gang or what to call us also makes thrust tubes. I do CAD work, LHS has a router and CS turbine service spins funnels and welds the tubes.
If we can agree on a pipe length I think I can do the G10 parts just on photos. Finding a fuel tank can not be too hard, just get it via Sandor?!
I can also supply CAD services if given good sketches aka photos with a ruler included for size. "We" as in my LHS or the Swedish jet gang or what to call us also makes thrust tubes. I do CAD work, LHS has a router and CS turbine service spins funnels and welds the tubes.
If we can agree on a pipe length I think I can do the G10 parts just on photos. Finding a fuel tank can not be too hard, just get it via Sandor?!
12-18-2017, 10:19 AM
#55
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I might do a kit. If anyone want to bounce a kit via me I can make the conversion kit and then forward airframe. Would cost quite a bit in shipping though. Option 2, wait until I do my own A10, which I can not promise when.
I can also supply CAD services if given good sketches aka photos with a ruler included for size. "We" as in my LHS or the Swedish jet gang or what to call us also makes thrust tubes. I do CAD work, LHS has a router and CS turbine service spins funnels and welds the tubes.
If we can agree on a pipe length I think I can do the G10 parts just on photos. Finding a fuel tank can not be too hard, just get it via Sandor?!
I can also supply CAD services if given good sketches aka photos with a ruler included for size. "We" as in my LHS or the Swedish jet gang or what to call us also makes thrust tubes. I do CAD work, LHS has a router and CS turbine service spins funnels and welds the tubes.
If we can agree on a pipe length I think I can do the G10 parts just on photos. Finding a fuel tank can not be too hard, just get it via Sandor?!
12-20-2017, 12:36 PM
#60
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And your thrust line is currently at 5 degrees up, relative to the nacelle center-line?
Think I will aim for a tad more than that if you say you still get a good bit of negative thrust/pitch coupling. (curved thrust tubes may be the way to go here I think)
12-20-2017, 12:39 PM
#61
i pointed the tube up from center maintube line and turbine all level with nacelle.
i tried to point tube upwarts and engine also but you run out of space fast
12-20-2017, 12:43 PM
#62
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wouldnt use that just use a bit of scrap tube and point it upwarts , i have about 5 degrees , i think 6 or 7 will do also since mine still wants to nose down a little on full power.
i pointed the tube up from center maintube line and turbine all level with nacelle.
i tried to point tube upwarts and engine also but you run out of space fast
i pointed the tube up from center maintube line and turbine all level with nacelle.
i tried to point tube upwarts and engine also but you run out of space fast
I'm probably getting a kit made for the 90mm nacelles sometime next year so will have to see how it turns out.
12-20-2017, 12:45 PM
#63
Indeed. I think the optimal solution here would be to mount the turbine in the nacelle center-line (all forward) and use a pipe that starts off at the same line and curves at the aft end. Should provide both best possible airflow (cooling), look good, as well as provide enough thrust vectoring.
I'm probably getting a kit made for the 90mm nacelles sometime next year so will have to see how it turns out.
I'm probably getting a kit made for the 90mm nacelles sometime next year so will have to see how it turns out.
i even taken off on one since i forgot to let the right engine come to idle so when i applied full throttle the second engine did not respond since the ecu did not release it yet.
you will love it
if anyone is interested i am getting a P-20 from a friend 30 hours total but has been back at 25 hours( Bearing changed) with a troubled combustion chamber , that is now fixed.
turbine runs great and i am selling cheap!
if interested send me a mail on sandor at digitech dot nl
Last edited by digitech; 12-20-2017 at 12:48 PM.
12-20-2017, 12:54 PM
#64
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dont make it to expensive no need for curved thrust pipes , i can fly it on one engine only!
i even taken off on one since i forgot to let the right engine come to idle so when i applied full throttle the second engine did not respond since the ecu did not release it yet.
you will love it
i even taken off on one since i forgot to let the right engine come to idle so when i applied full throttle the second engine did not respond since the ecu did not release it yet.
you will love it
I'll let Henke play around with it when I get the motor housing shipped to him. The 90mm housing should also have a bit more room to exploit, so might indeed get away with straight tubes.
No disaster to have a bit of coupling neither - perfectly normal for A-10 models. As long as the pilot is aware it is generally not an issue.
12-20-2017, 12:57 PM
#65
I'm sure it works fine, just trying to get it as perfect as possible when I first put the effort into converting. The tubes aren't really the relevant worry when it comes to expenses anyway lol
I'll let Henke play around with it when I get the motor housing shipped to him. The 90mm housing should also have a bit more room to exploit, so might indeed get away with straight tubes.
No disaster to have a bit of coupling neither - perfectly normal for A-10 models. As long as the pilot is aware it is generally not an issue.
I'll let Henke play around with it when I get the motor housing shipped to him. The 90mm housing should also have a bit more room to exploit, so might indeed get away with straight tubes.
No disaster to have a bit of coupling neither - perfectly normal for A-10 models. As long as the pilot is aware it is generally not an issue.
12-20-2017, 01:00 PM
#66
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I was still talking about pitch, not yaw.
Single engine operations is another topic entirely
And yeah, I would imagine you needed a lot on that takeoff lol. Probably far less of an issue if you get a single side flameout during normal flight (where you already have speed/altitude and don't need to use a lot of throttle)
I have an SU-35 that I have flown on single engine too, works, but needs a good bit of rudder indeed. Still better than not having any engine at all
Single engine operations is another topic entirely
And yeah, I would imagine you needed a lot on that takeoff lol. Probably far less of an issue if you get a single side flameout during normal flight (where you already have speed/altitude and don't need to use a lot of throttle)
I have an SU-35 that I have flown on single engine too, works, but needs a good bit of rudder indeed. Still better than not having any engine at all
12-20-2017, 01:02 PM
#67
I was still talking about pitch, not yaw.
Single engine operations is another topic entirely
And yeah, I would imagine you needed a lot on that takeoff lol. Probably far less of an issue if you get a single side flameout during normal flight (where you already have speed/altitude and don't need to use a lot of throttle)
I have an SU-35 that I have flown on single engine too, works, but needs a good bit of rudder indeed. Still better than not having any engine at all
Single engine operations is another topic entirely
And yeah, I would imagine you needed a lot on that takeoff lol. Probably far less of an issue if you get a single side flameout during normal flight (where you already have speed/altitude and don't need to use a lot of throttle)
I have an SU-35 that I have flown on single engine too, works, but needs a good bit of rudder indeed. Still better than not having any engine at all
a10 really flies nice and forgiving , very smooth to land.
you will like it , and that for a fraction of the mibo one , and easyer to replace foam
good luck
12-20-2017, 01:05 PM
#68
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Which is also kind of what justifies spending so much on upgrading it - it is a very nice every day model that I fly completely relaxed and in all weather conditions. Also very nice to transport and store compared to larger models.
12-20-2017, 10:33 PM
#69
This is how 4 degrees look. I estimated 85mm tube length 300mm from motor mount to rear exhaust.
This would be possible, specially on the 90mm housing.
You can do amazingthings with turbines and foam, even I get surprised from time to time how little of a problem the heat is. Here the Yak130, it needed 10+10degrees which also helped deflect the exhaust from the stab. With this setup thrust line is so good you can tail slide it
This would be possible, specially on the 90mm housing.
You can do amazingthings with turbines and foam, even I get surprised from time to time how little of a problem the heat is. Here the Yak130, it needed 10+10degrees which also helped deflect the exhaust from the stab. With this setup thrust line is so good you can tail slide it
12-20-2017, 10:35 PM
#70
This is how 4 degrees look. I estimated 85mm tube length 300mm from motor mount to rear exhaust.
This would be possible, specially on the 90mm housing.
Attachment 2248210
You can do amazingthings with turbines and foam, even I get surprised from time to time how little of a problem the heat is. Here the Yak130, it needed 10+10degrees which also helped deflect the exhaust from the stab.
This would be possible, specially on the 90mm housing.
Attachment 2248210
You can do amazingthings with turbines and foam, even I get surprised from time to time how little of a problem the heat is. Here the Yak130, it needed 10+10degrees which also helped deflect the exhaust from the stab.
will look terrible in the front , since the starter is terrible off centre.
butthe drawing is nice
12-21-2017, 01:02 AM
#71
12-21-2017, 01:48 AM
#72
like i said i centered the thrustpipe all the way thru the last former , then i cut 2 pieces of pipe and made a 5 degree vector and placed them with 2 small m3 screws so i can still alter the degrees.
there is no powerloss , infact with 2 p-20 is still overpowered i think
12-21-2017, 08:10 AM
#73
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like i said i centered the thrustpipe all the way thru the last former , then i cut 2 pieces of pipe and made a 5 degree vector and placed them with 2 small m3 screws so i can still alter the degrees.
there is no powerloss , infact with 2 p-20 is still overpowered i think
there is no powerloss , infact with 2 p-20 is still overpowered i think
I'm a big fan of having the turbine mounted according to the nacelles, both in terms of looks as well as letting air equally in on all sides. Blocking one side by having the turbine mounted very much off center will necessarily kill some cooling on that side.
Don't get me wrong, I have enough experience with converted foamies that I am not whining about heat problems like a lot of people might, but it still doesn't hurt to do it as "right" as possible.