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herbgh
Joined: 10 Jan 2006
Posts: 145
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 Posted: Thu Dec 14, 2006 10:08 pm Post subject: Hirth and Rotax a comparison |
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John
I agree and would ask..are Rotax engines designed to run at 75% power
to achieve TBO? For instance, that would be abt 5100 RPMs for a DCDI
503. Abt 39 hp.. The roughly equivalent Hirth is the 3702 which develops
55 hp at 5500 rpms.. Its 75 % power is at 4100 rpms.. 41 hp.
Herb
On Thu, 14 Dec 2006 14:55:53 -0600 "John Hauck" <jhauck(at)elmore.rr.com>
writes:
| Quote: |
| The lower rpms of the Hirth engines might account for some of
their
| stated 1000 hour overhaul? Herb
Herb:
Isn't operational rpm a design factor?
Running an engine too slow can be as harmful to it as over
speeding.
john h
mkIII
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jindoguy(at)gmail.com
Guest
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| Posted: Fri Dec 15, 2006 2:08 pm Post subject: Hirth and Rotax a comparison |
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Anyone, anywhere, that has run a Hirth to TBO please step up and tell us about it. I'd love to have the confidence to buy that little flat twin of theirs for my motorglider, but the total package, i.e. fleet installs, repair data, parts availability, service information, and service availability, just doesn't stand up. I'm already into the A model of the MG, I think it unwise to add the engine into it, too. This 1000 hour TBO gets tossed around like it means something. No TBO means anything outside of advertising horse exhaust. If you don't make it, the warranty was most likely over long ago anyway so all you become for anyone is a data point of the real longevity of that engine.
Rick
On 12/15/06, Herb Gayheart <herbgh(at)juno.com (herbgh(at)juno.com)> wrote: | Quote: | --> Kolb-List message posted by: Herb Gayheart <herbgh(at)juno.com (herbgh(at)juno.com)>
John
I agree and would ask..are Rotax engines designed to run at 75% power
to achieve TBO? For instance, that would be abt 5100 RPMs for a DCDI
503. Abt 39 hp.. The roughly equivalent Hirth is the 3702 which develops
55 hp at 5500 rpms.. Its 75 % power is at 4100 rpms.. 41 hp.
Herb
On Thu, 14 Dec 2006 14:55:53 -0600 "John Hauck" < jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>
writes:
| Quote: | --> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>
| The lower rpms of the Hirth engines might account for some of
their
| stated 1000 hour overhaul? Herb
Herb:
Isn't operational rpm a design factor?
Running an engine too slow can be as harmful to it as over
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|
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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dhkey(at)msn.com
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| Posted: Fri Dec 15, 2006 3:31 pm Post subject: Hirth and Rotax a comparison |
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I don't think you can compare the two engines. Who uses Hirths any more?
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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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| Posted: Fri Dec 15, 2006 4:06 pm Post subject: Hirth and Rotax a comparison |
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| Quote: |
I don't think you can compare the two engines. Who uses Hirths any more?
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I do......
Jim Baker
580.788.2779
Elmore City, OK
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