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Author Topic: APS/Ω Gas turbine bike build  (Read 545199 times)
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tauruck
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« Reply #1185 on: January 14, 2016, 07:59:42 PM »

He's rubbing our noses in it Jon. grin
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Mobacken Racing
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« Reply #1186 on: January 15, 2016, 02:54:16 PM »

I often feel the other way around, -'Redlighted at 8000rpm? Are you kidding, it is not even self sustaining revs......ohh wait it is a piston engine...'  grin
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Mobacken Racing
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« Reply #1187 on: January 15, 2016, 03:21:02 PM »

I have the old numbers from the gas producer tests to compare the upcoming test with, hopefully the rpm/P2 graph looks the same and the exhaust temp is showing lower numbers with the more accurate Autometer thermocouple and gauge.



First I have to make a new dashboard with enough room for the Auber tacho, while I am at it I´ll fit an extra tachometer to measure the freepower revs on the gearbox output shaft. That will prove useful to determine the correct gearing at the races.

Cheers!
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Mobacken Racing
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« Reply #1188 on: January 16, 2016, 05:34:52 PM »

Since I have made some changes to the number of gauges lately I needed to make a new dashboard, so that became my Saturday evening job.



No 3D-scanning, measuring or other fancy pants methods for this job. grin



To avoid restricting my line of sight through the wind screen more than absolutely needed I decided to make the dashboard from plexiglas, to cut the holes I used an oscillating saw I´ve borrowed from my father.



Here you can see all of the gauges, there is the gas producer tachometer on top, oil pressure, exhaust temp and P2 pressure on the middle row and a tachometer for the gearbox output shaft furthest down.



Cheers!
/Anders
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tauruck
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« Reply #1189 on: January 17, 2016, 03:39:37 AM »

I wanted to ask what fairing screen you're using?.

Thanks Anders. cheers
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Mobacken Racing
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« Reply #1190 on: January 17, 2016, 04:33:37 AM »

I wanted to ask what fairing screen you're using?.

Thanks Anders. cheers

I bought it here:

http://www.sp125racing.com/rs125-honda-fairings.html
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tauruck
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« Reply #1191 on: January 17, 2016, 05:13:21 AM »

Thanks, It looks like one of those might work on my liner. I'll have to check it out and get profiles & measurements.  cheers cheers cheers cheers cheers
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Mobacken Racing
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« Reply #1192 on: January 17, 2016, 05:34:03 AM »

Thanks, It looks like one of those might work on my liner. I'll have to check it out and get profiles & measurements.  cheers cheers cheers cheers cheers

If you need any measurement on the wind screen just ask and I´ll get it for you.
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tauruck
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« Reply #1193 on: January 17, 2016, 07:02:38 AM »

Thanks Anders. cheers cheers cheers cheers
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Polyhead
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« Reply #1194 on: January 17, 2016, 09:10:28 PM »

It's probably already been asked somewhere in this thread, but I can't find it.

What's the throttle lag like?  And I don't just mean in time, but, what's it like wrapping your head around it the first time?

BTW the bike is in every impressive.
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Ben 'Polyhead' Smith
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Mobacken Racing
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« Reply #1195 on: January 18, 2016, 07:21:51 AM »

It's probably already been asked somewhere in this thread, but I can't find it.

What's the throttle lag like?  And I don't just mean in time, but, what's it like wrapping your head around it the first time?

BTW the bike is in every impressive.

The closest thing to it must be a turbocharged bike with lots of turbo lag, you grab a handful of throttle, hear the growl from the turbine exhaust when the temps and revs from the gas producer jumps up and then a firm and steady push from behind.

Nothing like a piston engine, I used to ride a tuned Hayabusa on the street and that thing was wild, the gas turbine bike is just as fast on the standing mile but it doesen´t feel like it since the power comes on so smooth. Sort of like an electric motor feeling.

Thank you! Smiley
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Mobacken Racing
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« Reply #1196 on: January 21, 2016, 01:50:07 PM »

Last night I fitted the inductive sensor for the gearbox tachometer, if I multiply the measured rev with 5 I get the freepower turbine revs. That will be very useful information when I decide which gearing to run at the races, the closer to the max spec. revs of 33.000rpm I can run the more power the engine produces.



After some wiring and the painful realization that I need to sort out the rat nest of wires behind the dashboard the tachometer was working, sweet! smiley



I also added a 1mm thick graphite gasket between the freepower housing v-band flanges to get some extra clearance between turbine wheel and NGV stators, I had the slightest rubbing when I turned the freepower by hand that I needed to get rid of.

Cheers!
/Anders
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Glen
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« Reply #1197 on: January 21, 2016, 02:27:24 PM »

Hope the plastic dash doesn't crack and brakes from vibration.
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Glen
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« Reply #1198 on: January 21, 2016, 02:49:44 PM »

Hope the plastic dash doesn't crack and brakes from vibration.

With the fairings on I can fit a pair of simple brackets between the top of the dashboard and the front fairing, that should keep it from flexing. Good pointer Glen.
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Polyhead
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« Reply #1199 on: January 22, 2016, 12:10:30 PM »

Hope the plastic dash doesn't crack and brakes from vibration.

With the fairings on I can fit a pair of simple brackets between the top of the dashboard and the front fairing, that should keep it from flexing. Good pointer Glen.

Just shove a few more fist fulls of wire behind it... it'll be supported and it's not like you can remember what all of those do anyway.
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Ben 'Polyhead' Smith
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