R-985 Blower Ratios

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A place where restoration project-type threads can go to avoid falling off the main page in the WIX hangar. Feel free to start threads on Restoration projects and/or warbird maintenance here. Named in memoriam for Gary Austin, a good friend of the site and known as RetroAviation here. He will be sorely missed.
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Fearless Tower

R-985 Blower Ratios

Tue Nov 08, 2016 8:53 pm

Does anyone know if there were different blower ratios for R-985s for different aircraft installations or where all R-985 blowers geared for the same ratio?
bdk
  • bdk
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Re: R-985 Blower Ratios

Wed Nov 09, 2016 11:12 am

According to the type certificate data sheet, there were two ratios used.

7.1:1 on the R-985-5 (350 HP)
10:1 on other models (450 HP)

http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/55f5d74fc76375d58525676a00677446/$FILE/ATTFPUN1/5E-1.pdf
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