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  #81  
Old 03-03-2019, 10:18 AM
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rv6ejguy rv6ejguy is offline
 
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That's pretty good and will be a game changer in the market if the numbers prove out in flight testing.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 441.0 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
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  #82  
Old 03-03-2019, 01:41 PM
rocketman1988 rocketman1988 is offline
 
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Default But

But at what price point?
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  #83  
Old 03-03-2019, 02:09 PM
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rv6ejguy rv6ejguy is offline
 
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Looks like they're aiming for Lyc 360 type pricing. We'll see how that ends up when they come to market.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 441.0 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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  #84  
Old 03-03-2019, 02:35 PM
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blueflyer blueflyer is offline
 
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Quote:
Originally Posted by rv6ejguy View Post
Looks like they're aiming for Lyc 360 type pricing. We'll see how that ends up when they come to market.
that would be really enticing.
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  #85  
Old 03-03-2019, 03:21 PM
rocketman1988 rocketman1988 is offline
 
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Default We will see

That is a pretty tall order. I hope they can achieve it...
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues+ Paid 2019,...Thanks DR+
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  #86  
Old 03-03-2019, 04:09 PM
Timberwolf Timberwolf is offline
 
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Location: Navarre, FL
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They would be the first to achieve such a low price point for a new engine with that capability. The helo guys have been buying T-62's and variants for a while at low prices, but nothing comes close until you step up to a PT6A-20 which can be had ~$80k. Though that exceed the HP we would need on an RV I thought long and hard about it for one of my projects. However the 32 gal/hr at cruise figure well exceeded the practicality of such.

Would really love to see this engine work out.
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  #87  
Old 03-04-2019, 04:38 AM
Turbine Aeronautics Turbine Aeronautics is offline
 
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Updated estimations following the most recent design work have the price point in the region of $50k so we are now above the new IO360 in purchase cost. That is more than we would have liked but given the benefits of such an engine, we believe it still represents good value.

The minimal routine maintenance and the projected longer TBO, combined with the lower projected cost of overhaul should result in a lower hourly cost to run the engine than the LyConti?s. And then there are the (in general) cheaper fuels...

Dave
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  #88  
Old 03-04-2019, 05:37 AM
rocketman1988 rocketman1988 is offline
 
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Default Good

I really hope you can keep it in that ballpark...it would certainly make a nice alternative to the 50+year old, $50k+ engines we are stuck with now...
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Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...

Dues+ Paid 2019,...Thanks DR+
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  #89  
Old 03-04-2019, 06:16 AM
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rv6ejguy rv6ejguy is offline
 
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Quote:
Originally Posted by Turbine Aeronautics View Post
Updated estimations following the most recent design work have the price point in the region of $50k so we are now above the new IO360 in purchase cost. That is more than we would have liked but given the benefits of such an engine, we believe it still represents good value.

The minimal routine maintenance and the projected longer TBO, combined with the lower projected cost of overhaul should result in a lower hourly cost to run the engine than the LyConti?s. And then there are the (in general) cheaper fuels...

Dave
Valid points however it's really best not to project TBOs before even a single example has gone that many hours running in the real world...
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 441.0 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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  #90  
Old 03-04-2019, 11:41 AM
breister breister is offline
 
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Quote:
Originally Posted by rv6ejguy View Post
I don't think you'll see a non-flat rated 200hp turbine produce 150 hp at 17,500 feet. Turbo normalize the Lycs and you'd get some good speeds and fuel flows running LOP.
I started with this:

"However, our 200hp engine is being optimised for a 180hp cruise at 10,000'"

I guesstimated 150hp up to about 15,000', with normal lapse rate thereafter. As I said, my napkin math may be far off!

A turbine is not exactly like turbonormalized piston, but as you pointed out they are generally flat rated (due to heat in the hot section) up to some altitude and then lapse the same as a normally aspirated. TA is saying they still generate 180hp @ 10,000', so 150hp per engine @ 15,000' is not a bad guess, and incidentally is the same horsepower as two normally aspirated IO 360 200 hp motors @ 75% power. With two engines, that is 300hp@15k'; normal lapse should drop you down to ~65% power @ FL250. You are looking at less horsepower but also less induced drag as you get closer to L/D (max) so IAS should drop slightly but TAS should continue to increase a bit. The general formula usually applies until you approach high Mach numbers, when induced drag begins to rise despite low IAS.

Again the caveats - my recollections are 35 years old, and this ain't no Phantom!
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