GPS Speedo

[boscoe99]

When "propping" a motor, better to use Pitot speed or GPS speed?

 

[airshot]

When "propping" a motor, better to use Pitot speed or GPS speed?

Tachometer is the best, speed is not a real factor

 

[jlh3rd]

anyway.
Since my gps speedo does a reset anytime there is the slightest interruption in the electrical supply, it helped me diagnose a corroded section of the power wire from the battery to the ignition switch before it left me stranded.

yep, prop for correct rpm, speed is what your left with.

 

[ratdude747]

Tachometer is the best, speed is not a real factor

Technically, it can be if comparing props of different types (material, blade count, rake, diameter, etc.), although the "is is a correct prop" determination is a factor of WOT RPM and what the engine's spec calls for.

 

[Jeff J]

I never noticed any performance differences between materials and number of blades but I don’t have a need or desire to squeeze every bit of performance out of a boat. Diameter and pitch make noticeable differences.

 

[Mc Tool]

I never noticed any performance differences between materials and number of blades but I don’t have a need or desire to squeeze every bit of performance out of a boat. Diameter and pitch make noticeable differences.

Yeah ,I bought my last prop of aliexpress ....Solas ...80 bucks ....coulda spent 4 hundy, and if I feel like goin all posh I can paint it a different colour

 

[redneck joe]

Yeah ,I bought my last prop of aliexpress ....Solas ...80 bucks ....coulda spent 4 hundy, and if I feel like goin all posh I can paint it a different colour

i run upstream as far as I can / should so I just budget a new Solas every year.

 

[Mc Tool]

i run upstream as far as I can / should so I just budget a new Solas every year.

Heh , when I got my project Tohatsu the prop was so munted I couldnt suss the pitch or dia , I had to go google and then I still had to take a guess as to the correct pitch for it ....just went with the one it listed as the one it was sold with ....works good