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RR500 turboprop

RR Family of Aircraft Engines

RR500 turboprop

Postby f4dj79 on Wed Jun 03, 2009 5:08 pm

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Re: RR500 turboprop

Postby j79guy on Thu Jun 04, 2009 9:17 pm

Hmmmm.... An Allison 250-B17 by any other name? I notice RR doesn't offer fuel consumption specs in comparison to the piston engines this "new" engine is supposed to be competitive with.

Robin.
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Re: RR500 turboprop

Postby f4dj79 on Fri Jun 05, 2009 4:51 pm

When I saw the cute little toy I thought it was a piston engine? I still can not get over the fact that turbine enigne manufacturers do not post emissions readings on any turbine. What is up with that?
WB
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Re: RR500 turboprop

Postby TillamookTurbine on Mon Jun 08, 2009 6:56 pm

Looks like an Allison 250 to me. Soloy's been offering STC conversions of C206, C185 with the 250 for about 25 years. Fuel consumption's an issue as well as cost since the 250 costs about 3 times what the TCM IO-520 that it replaces costs.

Terry
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Re: RR500 turboprop

Postby j79guy on Tue Jun 09, 2009 9:19 am

My points exactly. It looks like a more modern version of the 250, with fewer stages of axial compression, like the C30 units. When sales slump, tart it up, put on a new name and trot it out as a new engine!
As the unit is simple cycle, the part throttle efficiency will not be good. Emissions? strictly a function of residence time in the combustion zone and firing temp. likely on the order of 100-120 ppm Nox @ 15% O2 @ rated power. CO will be high, not sure what the exact numbers will be.

Robin.
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Re: RR500 turboprop

Postby f4dj79 on Wed Jun 10, 2009 10:42 pm

Wow guys when I started this post I never thought there would be so much insite into the R/R updated RR500 power plant. The things one learns when one opens the door. So I looked at the two engines types the allison 250 and the rr500 and there are very subtle changes. To the novice these changes would not mean very much. So thanks for pointing out the now obvious changes. Yup, once an allison always a rolls royce.
WB
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