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Seriously though, if someone comes through with the right engine, someone else will undoubtedly try pressurization. Probably not me, at least not in my current plane, and probably never as I'm getting old. |
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And yes, most of the fleet is not pressurized and old girlfriends won't want to wear the mask. I don't recall which air frame you are quoting, but my current air frame would scoot considerably faster than 180ktas on 140hp @ 18,000'. A twin Velocity, if their ad is to be believed, should be very close to 210IAS with that horsepower which would be over 335ktas @FL200. I think my math is wrong on that, using 3% / 1,000' increase in TAS for the same IAS? There is probably some penalty for prop inefficiency up higher I'm not including. |
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It's about free air conditioning and easy heating. All you need is an inter-cooler, a water separator, and an expansion valve. Lightweight, can fit under almost any cowling. BIG opportunity for a selling point, especially if you cobbled together a kit for people... :D If you make it standard, but ship it capped, it would preclude needing a separate design. Of course, you could probably charge a premium for the feature too. It's not drilling the hole that is expensive, it's knowing where to drill... ;) |
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...and
...and, as always, the devil is in the details.
What do you think happens when you start siphoning off bleed air? Let me give you a hint: TANSTAAFL "There Ain't No Such Thing As A Free Lunch":rolleyes: |
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Dave,
Is there some reason your engine design suffers less power loss with altitude than PWC engines? Some test data on these shows variously 37-47% loss in shp at 17,500 feet depending on model and TAS. You're saying only a 31% loss in power. I understand the recuperator improves the SFC at the expense of a loss in hp. Is the thermodynamic rating of your engine higher than 200 shp at sea level/ standard day conditions? |
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We want to make this engine as affordable as possible which means that at least initially, some non-essential features such as bleed air which comes at a cost, will not be designed into the engine. Most of our customers will be operating below 10,000?, most of the time. It is for this large group that we need to make it affordable for. If we subsequently offer an engine with a bleed port, that will come at at the expense of increased cost due to different turbomachinery, different architecture etc. |
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