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Post by aquaticharpy on Sept 30, 2019 0:17:36 GMT -5
I was thinking around a 1.00 to 1.5 Ring and pinion ratio for the differential. Able to hit around 180 while the torque converter can do drag accelerations and hopefully the turbine can do a mean acceleration throughout the mph range without
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Post by racket on Sept 30, 2019 1:08:24 GMT -5
Hi 300 HP won't get you to 180 mph in a regular car ..................what sort of vehicle are you building ?? Have a look at the torque graphs here turbotrain.net/en/whatsgasturbine.htm and you'll understand why we don't need multispeed transmissions .....................our "power band " is everywhere , there is no "band" . A two shaft turbine engine works from zero RPM right through to 100% RPM of the freepower , but if you want a transmission, fit one , but make it a strong one to handle the >500 ft lbs of stall torque . As for tyre speeds , a 14" rim has a tyre of ~25" dia with a circumference of ~6.55 feet so will turn ~800 times in a mile , at 120 MPH thats ~1,600 revolutions/minute , with 6,000 rpm coming out of the turbine we'd need a 3.75:1 diff ratio to achieve 120 mph at 100% N2 with a solid connection between engine and wheels, no slipping converter. Cheers John |
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Post by enginewhisperer on Sept 30, 2019 1:34:00 GMT -5
a multi speed transmission will definitely help with acceleration times to lower speeds, but you can't really use a normal manual gearbox and clutch type setup because you can't reduce the turbine engine power fast enough to slow the power turbine during gear changes.
An auto transmission would work, but they also tend to waste a fair bit of power.
A good auto setup with a lock up torque converter could probably be fairly nice, but it's still adding a lot of weight and complexity to the overall system.
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Post by aquaticharpy on Sept 30, 2019 8:14:40 GMT -5
A manual transmission would add a fair amount of weight but be great for acceleration and top end. Yet, no slowing down by downshifting and you run the risk of over revving the turbine at that point.
I'm building a track purpose Bradley GT2. Fiberglass body on a vw beetle chassis.
I'm still going for a direct drive torque converter setup.
Hopefully the turbine will be able to cope with trying to move 1500lb and get up to speed quickly.
I'm sorta stuck inbetween manual gearbox or direct drive setup now..
🤷♂️
~John
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BFTO
Veteran Member
Joined: February 2016
Posts: 128 
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Post by BFTO on Sept 30, 2019 8:37:19 GMT -5
A manual transmission would add a fair amount of weight but be great for acceleration and top end. Yet, no slowing down by downshifting and you run the risk of over revving the turbine at that point. I'm building a track purpose Bradley GT2. Fiberglass body on a vw beetle chassis. I'm still going for a direct drive torque converter setup. Hopefully the turbine will be able to cope with trying to move 1500lb and get up to speed quickly. I'm sorta stuck inbetween manual gearbox or direct drive setup now.. 🤷♂️ ~John
Hi John Im confused here... dont go with a manual gearbox. Go with direct drive if you want it to be light and "easy" to build. If you want more complexity, go with a torq converter and direct drive. And if you want a lot of variables and complexity and money, torq converter with a auto gearbox. To select the right torq converter for your car and engine setup will be a hard. If you want more power, go for the Boeing/Cat 553. From the Swedish S-tank 103C en.wikipedia.org/wiki/Stridsvagn_103 |
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Post by aquaticharpy on Sept 30, 2019 13:32:11 GMT -5
I cant find any Boeing 553's available for sale. Any 2 shaft turbines with around 700hp available?
Thanks
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BFTO
Veteran Member
Joined: February 2016
Posts: 128
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Post by BFTO on Sept 30, 2019 15:55:35 GMT -5
They dont grow on trees, it will take months/years to source a good engine. You will learn that working with this kind of engines takes time. If you have the money and want something faster, contact a dealer. But I need to warn you, some serious power/torq.. I know Harry has RR Gems, two years ago they was 9000£ with control box with gauges and teststand. www.jetenginetrader.co.uk/product-category/engines/rr-gem/If you have more money, you can talk to Larry @ www.turbinefun.com/He had some T58s and Gnomes a year ago, 24750$ for a Gnome with SDG.. |
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Post by aquaticharpy on Sept 30, 2019 17:02:32 GMT -5
Alright. I'll keep an eye out. Also, I'll do a direct drive torque converter setup and see how it goes.
Thanks!!
John
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Post by aquaticharpy on Sept 30, 2019 22:17:35 GMT -5
Do you think it would be possible to build or convert a turbine to run on hydrogen gas with oxygen as well? Say if we had a few alternators doing electrolysis of the hydrogen oxygen combustion that made water perhaps it would be possible to electrolysize the water back into the gasses to keep the turbine running?? Perhaps 2 compressed tanks? Just an idea.. 🤔
John
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BFTO
Veteran Member
Joined: February 2016
Posts: 128
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Post by BFTO on Oct 1, 2019 0:21:36 GMT -5
Do you think it would be possible to build or convert a turbine to run on hydrogen gas with oxygen as well? Say if we had a few alternators doing electrolysis of the hydrogen oxygen combustion that made water perhaps it would be possible to electrolysize the water back into the gasses to keep the turbine running?? Perhaps 2 compressed tanks? Just an idea.. 🤔 John
No..
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Post by aquaticharpy on Oct 1, 2019 7:57:23 GMT -5
Alright. I'll hopefully be picking up an engine soon! I'll be sure to send pics as the project progresses!
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Post by aquaticharpy on Oct 1, 2019 8:03:44 GMT -5
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BFTO
Veteran Member
Joined: February 2016
Posts: 128
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Post by BFTO on Oct 1, 2019 8:56:26 GMT -5
No.. I think you should start and read some books and around the internet for a couple of months and get the knowledge of this kind of engines before you buy 200kg of scrap. |
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Post by aquaticharpy on Oct 1, 2019 13:27:10 GMT -5
Ok then
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Post by aquaticharpy on Oct 1, 2019 19:42:05 GMT -5
What do you think of this I found on YouTube? Using such a engine has led to solve some problems in the development phase such has the immense lag standard turbines have during accelerations plus even the deceleration wasn't their best. So two wastegates were added between the two turbines working in tune with the throttle: as more throttle was applied the wastegates closed gradually, feeding more and more gasses to the second turbine generating power. www.youtube.com/watch?v=LQYlPRXEeKYHow easily would this be accomplished? And how much might it cost me on a T50 8A Turbine or similar. Ive done research and now understand why we want a turbine with a free power section so now Im narrowing down a turbine. Thanks Guys! John |
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