• Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation. Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts. Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Embark on your journey now!

    Click Here to Become a Premium Member and Experience Homebuilt Airplanes to the Fullest!

PSRU Gear Ratio vs. Prop Tip Speed

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

TXFlyGuy

Well-Known Member
Joined
Apr 25, 2012
Messages
2,973
Location
Republic of Texas
Which option will produce the most thrust, and be efficient?

LS3 480 V8 + 96" Prop.

Gear ratio 1.9 - 1
This would allow a max cruise engine rpm of 3100. This equates to 195hp (10,000' AGL), and the prop spins at 1630 rpm.

Or

Gear ratio 2.21 - 1
This allows a max cruise engine rpm of 3600. That's 232hp (10,000' AGL), prop turns at 1630 rpm.

In both examples, the tip speed is 465mph, or .60 Mach.

Which one will give the best cruise speed in IAS?
 
Back
Top