Idok,
I'm wondering if maybe the pump shaft tube had a small air leak in the Rev hull, as that will make a prop act smaller than it's pitched at.
You might go with a 12/18 Skat-Trak and a stock pumpcone with your bored nozzle, and check the pumpshaft tube for any airleak.
I use a A/C vacuum pump and a round disk with closed cell foam glued to it and a fitting to plug in the vacuum hose. Use waterproof grease to seal to the tube.
Note: Must always vacuum test pump shaft tubes before changing prop pitch!
With this vacuum test, are you looking for a bad (cracked/split) rubber isolator? Or just general leakage that can come from also a bad backside seal on the housing or a broken bond/fractured driveshaft tube. (see Pic).Idok,
I'm wondering if maybe the pump shaft tube had a small air leak in the Rev hull, as that will make a prop act smaller than it's pitched at.
You might go with a 12/18 Skat-Trak and a stock pumpcone with your bored nozzle, and check the pumpshaft tube for any airleak.
I use a A/C vacuum pump and a round disk with closed cell foam glued to it and a fitting to plug in the vacuum hose. Use waterproof grease to seal to the tube.
Note: Must always vacuum test pump shaft tubes before changing prop pitch!
Idok,
I'm wondering if maybe the pump shaft tube had a small air leak in the Rev hull, as that will make a prop act smaller than it's pitched at.
You might go with a 12/18 Skat-Trak and a stock pumpcone with your bored nozzle, and check the pumpshaft tube for any airleak.
I use a A/C vacuum pump and a round disk with closed cell foam glued to it and a fitting to plug in the vacuum hose. Use waterproof grease to seal to the tube.
Note: Must always vacuum test pump shaft tubes before changing prop pitch!