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Author Topic: APS/Ω Gas turbine bike build  (Read 546086 times)
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gidge348
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« Reply #540 on: June 05, 2014, 07:15:02 AM »

Some sort of heat shielding underneath the battery will also be needed so I donīt cook it from the radiant heat coming from the engine exhaust.

The best heat shielding I have found is Air.... If you put another layer of aluminium with say 10mm gap and reasonable air flow this will stop the heat sink effect of the battery in contact with any panel that is likely to conduct, convect or radiate the heat.

Cheers Ian..
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Mobacken Racing
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« Reply #541 on: June 05, 2014, 01:12:59 PM »

I agree Ian, and wrapping the engine in a heat blanket only increase the risk of heat warping so Iīll fit some sheet metal shields around the power turbine ducting and let the air carry away the radiant heat.

The inter turbine section will be 750°C at full throttle so I donīt want to have my boots jammed up directly against it... smiley
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tauruck
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« Reply #542 on: June 05, 2014, 07:20:31 PM »

Anders, what front sprocket is that?.

It looks familiar.
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manta22
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« Reply #543 on: June 05, 2014, 08:35:20 PM »

I agree Ian, and wrapping the engine in a heat blanket only increase the risk of heat warping so Iīll fit some sheet metal shields around the power turbine ducting and let the air carry away the radiant heat.

The inter turbine section will be 750°C at full throttle so I donīt want to have my boots jammed up directly against it... smiley

Anders, if you really want to get fancy, gold plate your heat shield. Gold is the most effective reflector of infra-red radiation (heat) there is. That's why lots of space satellites are covered with a gold Mylar film-- so the sun's heat doesn't burn them to a crisp. It looks cool, too.  smiley

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
tauruck
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« Reply #544 on: June 05, 2014, 08:46:53 PM »

How much does that Mylar cost Neil?.
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gkabbt
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« Reply #545 on: June 05, 2014, 08:59:32 PM »

I agree Ian, and wrapping the engine in a heat blanket only increase the risk of heat warping so Iīll fit some sheet metal shields around the power turbine ducting and let the air carry away the radiant heat.

The inter turbine section will be 750°C at full throttle so I donīt want to have my boots jammed up directly against it... smiley

Anders, if you really want to get fancy, gold plate your heat shield. Gold is the most effective reflector of infra-red radiation (heat) there is. That's why lots of space satellites are covered with a gold Mylar film-- so the sun's heat doesn't burn them to a crisp. It looks cool, too.  smiley

Regards, Neil  Tucson, AZ

And when Wayne Jesel is running BMP with his Dodge truck, he uses the gold film!
Expensively COOL looking!

Gregg
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gidge348
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« Reply #546 on: June 06, 2014, 01:04:32 AM »

Yep you are right, as long as they stick it on the right side..... tongue tongue

http://www.bakerprecision.com/longacr51.htm

Seen lots of times put on turbo heat shields and radiator tanks.... rolleyes rolleyes just for street cred...

F1's and Indy cars put it on the underside of body panels,,,,,
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Mobacken Racing
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« Reply #547 on: June 06, 2014, 10:54:24 AM »

Anders, what front sprocket is that?.

It looks familiar.

Itīs an industrial sprocket, a friend modified it to fit the keyed output shaft from the gearbox.
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Mobacken Racing
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« Reply #548 on: June 06, 2014, 10:57:43 AM »

Anders, if you really want to get fancy, gold plate your heat shield. Gold is the most effective reflector of infra-red radiation (heat) there is. That's why lots of space satellites are covered with a gold Mylar film-- so the sun's heat doesn't burn them to a crisp. It looks cool, too.  smiley

Regards, Neil  Tucson, AZ

Thatīs a great idea Neil, I think Iīll need to use every trick up our sleeves to get the radiant temp down to pleasant levels for the feet.

Iīll make a stainless shield first and if it isnīt enough Iīll get some of that fancy gold plating stuff and coat it internally.
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manta22
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« Reply #549 on: June 06, 2014, 12:47:13 PM »

How much does that Mylar cost Neil?.

You'd have to ask NASA that, Mike.

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
manta22
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« Reply #550 on: June 06, 2014, 12:54:14 PM »

Thanks for the link to Baker Precision. I had not seen that stuff before.

Anders, you might compare the price for enough of that material to cover your heat shield with simply electroplating a thin layer of gold on both sides of your stainless steel heat shield. A thickness of 50 microinches or more should do it.

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
Peter Jack
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« Reply #551 on: June 06, 2014, 12:56:01 PM »

How much does that Mylar cost Neil?.

You'd have to ask NASA that, Mike.

Regards, Neil  Tucson, AZ

Neil, go back and follow the link on reply #547. Things that start out as for government use only slowly make it out to the racing community.

Pete
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Peter Jack
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« Reply #552 on: June 06, 2014, 12:58:31 PM »

Neil, obviously you were replying while I was replying!  grin grin grin

Pete
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grumm441
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« Reply #553 on: June 06, 2014, 08:48:15 PM »

Does anyone still do gold plating.
Super toxic chemicals involved.
G
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Mobacken Racing
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« Reply #554 on: June 11, 2014, 12:52:51 PM »

Last night I modified the battery box, I had to secure the battery well and make a mount for the main power switch. The bike class rules says no fabric or rubber clamps for the battery so I had to make a metal one.



I didnīt take many pics of the work since it wasnīt very exciting to see... smiley



The main switch key will come out through the side of the rear fairing so I can easily reach it from the drivers seat.



Cheers!
/Anders
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