artsi
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Joined: February 2017
Posts: 21
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Post by artsi on Dec 11, 2020 8:17:52 GMT -5
Hi. Yes that power gives pretty nice ride There is no gearbox. Only karting chain and sprockets with 11:1 gear ratio. My future plan is to make gearbox and clutch to help launches from stand still. Cheers. Arto
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artsi
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Posts: 21
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Post by artsi on Dec 11, 2020 2:14:24 GMT -5
Thanks!
Yes the video was made by professionals.
In dyno session we got maximum horsepower ~40hp with 3bar combustor case pressure and 700c turbine egt.
I think that is typical power for 67mm inducer compressor.
The torque was max 221nm at the wheel In lowest possible freeturbine rpm.
Cheers. Arto
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artsi
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Posts: 21
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Post by artsi on Dec 10, 2020 10:31:12 GMT -5
Hi all! I just wanted to share a latest video from my finished bike. Last months has been spent of making ecu/fadec to the bike. Now it runs completely with arduino. Oil pump, throttle, starting procedure, gauges are all controlled by three arduinos I got the bike to the episode of finnish YouTube series: youtu.be/OrvjmCBjlnQThere Will be english subtitles to the video soon. Cheers. Arto
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artsi
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Posts: 21
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Post by artsi on Feb 13, 2019 11:21:55 GMT -5
Hi, Andy Very nice starter mechanism you got there. Your desing is very similar to mine. I also made a slots to the end of clutch vanes. It helps clutch to stay disengaged when suction tries to pull it towards the compressor nut while running. I use this setup: fi.eurorc.com/product/14053/hobbywing-xerun-xr8-plus-combo---2250kvServotester does the job of operating starter motor in my bike. Do you use brake mode in your esc? I use 20% of brake force to help when disengaging starter. Cheers. Arto
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artsi
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Joined: February 2017
Posts: 21
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Post by artsi on Feb 12, 2019 13:40:54 GMT -5
Hi, Luke
Starter clutch is machined myself. Unfortunately i don't have any pictures of the build. It's basically same type that used on rc model turbines.
Cheers. Arto
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artsi
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Joined: February 2017
Posts: 21
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Post by artsi on Feb 7, 2019 5:47:53 GMT -5
I have been building this electric Starting system couple of months now. It uses a 1:8 rc buggy motor and esc. The motor gives power about 2.5kw with 22.2v lipo battery. It can easily spin the shaft about 30k rpm. From there the turbine accelerates to idle very easy. The starting clutch is bendix type witch i have made from brass and 13mm socket. I really like this bike setup now. I can take it somewhere to ride with no external starting equipment needed. Next step would be making some sort of fadec autostart, but then my limited building skills take apart. Cheers, Arto
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artsi
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Posts: 21
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Post by artsi on Feb 7, 2019 5:32:47 GMT -5
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artsi
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Post by artsi on Feb 6, 2019 17:01:05 GMT -5
Thanks, John
Ok, so i have 10mm id evap tubes and 190mm length.
So there are ~47728 sq mm of heating area.
That is over double times of area you suggested.
I will consider to make new shorter combustor if those evaps do fail in future. Other option is of course to replace them with smaller diameter tubes.
Cheers, Arto
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artsi
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Post by artsi on Feb 6, 2019 15:13:45 GMT -5
Couple more pictures. I was so excited to get my bike to Finland's biggest motorcycle show last weekend. There were 57 thousand visitors during the weekend.
Cheers,Arto
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artsi
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Posts: 21
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Post by artsi on Feb 6, 2019 7:37:10 GMT -5
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artsi
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Posts: 21
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Post by artsi on Feb 6, 2019 7:21:01 GMT -5
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artsi
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Posts: 21
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Post by artsi on Feb 6, 2019 6:51:55 GMT -5
Hi,John.
Thanks for the reply.
Good points there.
Actually i did make a new ngv section.
That picture is from the first version. Unfortunately i don't have picture of latest ngv. I managed to salvage ngv vanes from big old turbo which have nice aerofoil and tapered shape. Reason why i made this new ngv was due to high temps for early runs. That could be partly caused by those badly shaped vanes like you mentioned.
I don't have much calculations for evaporator heating surface area. I just wanted to make very generous size combustor based on jetspecs. It could be a tad shorter but since it's running so well i might keep it that way. Those inconel600 tubes are holding pretty well too. For my experience the stainless steel evaps doesn't last very long at any combustor.
Cheers, Arto
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artsi
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Posts: 21
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Post by artsi on Feb 4, 2019 10:20:42 GMT -5
Here is some pictures of my latest gas generator build. The engine is based of holset hx55 turbo with 67mm inducer comp wheel. The combustor is reverse flow annular type with evaporators. It has done many ours of testruns and different configurations. Biggest problems has been burned evaporator sticks. Replacing them with a inconel sticks solved the problem. I have kept egt temps 500-650c. Max boost pressure 3bar
Cheers,Arto
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artsi
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Posts: 21
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Post by artsi on Feb 4, 2019 10:01:15 GMT -5
Hello guys. It has been a while since the last post of this project. A lot of work has been done and the bike Is ready now!
Cheers, Arto
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artsi
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Joined: February 2017
Posts: 21
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Post by artsi on Mar 13, 2017 5:08:29 GMT -5
Hi John
Thanks for advice. Actually i was planning to change the rubber lines to copper ones at least where hottest parts are. What type of lines and fittings did you use in your bike and kart?
I bought the freepower wheel on local turbo rebuild shop. I don't know what turbo it's from. Inducter diameter is 170mm and ex 150mm tip width is ~20mm.
Cheers
Arto
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