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Kawasaki TA340 TA400 TA440 PSRU and Prop selection.

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fly_boy_bc

Well-Known Member
Joined
Aug 20, 2008
Messages
236
Location
Agssiz BC
I posted this as an answer in an old thread but it is in the supplies and mfgrs announcments forum so I thought I'd repost it here:


Roger Manns engine prop PSRU matrix (the single most trusted source for Kawasaki PSRU and prop information) for the 440a indicates 2.9:1 ratio and a 72 inch prop:
***************************************
These are some thrust check stats. that Roger got:
340 LC, 2.9 to 1 belt, 70X26 prop- 205 lbs. at 6800 RPM
340 FA, 2.8 to 1 belt, 68X26 prop- 190 lbs. at 6600 RPM
440A FA 2.9 to 1 belt, 72X32 prop- 225 lbs. at 6600 RPM

The stats. below with a shorter prop. are ok but not as good as above.
340 LC, 2.6 to 1 belt, 60X28 prop- 165 lbs. at 6800 RPM
340 FA, 2.6 to 1 belt, 58X26 prop- 155 lbs. at 6600 RPM
440A FA, 2.6 to 1 belt,60X28 prop- 160 lbs. at 6600 RPM

Note: The difference between a 340, 400 and 440 is
piston size, a 340 can be made into a 440.

I ABSOLUTELY do not recommend using any Propeller
Speed Reduction Unit(PSRU) that uses a 2.0 to 1 reduction. This sets up
harmonics that are dangerous. Several failures have been recorded. I also do not
recommend the 440B which is 48 hp but cannot be cruised between 5500 and 6000
RPM.

As shown above the best performance comes when using a longer prop.

How do these engines compare?
Rotax 277, 2.58 to 1 gearbox, 60X28 prop-160 lbs. at 6800 RPM
Rotax 503, 2.58 to 1 gearbox, 64X34 prop-200 lbs. at 6800 RPM
Rotax 503, 2.9 to 1 belt, 72X38 prop-260 lbs. at 6800 RPM

Most people who are dissatisfied with Kawasaki engine
packs are swinging short props with something below a 2.6 to 1 ratio. Much time
and money has gone into the short evaluation above but it proves that once set
up properly the 340 can't be beat for the money invested.
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I can not find any ground adjustable props that size! My fisher 101 is normally equipped with a 60 inch prop (clearance). I can extend the undercarriage somewhat but I doubt I can fit a 72 inch prop no matter what I do...Am I missing something?
 
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