Tunnel Questions...

[nitro_nemesis]

Friend of mine (Anthony Marquart) whom I run boats w/ told me I should register on this site to get intel for some of my boats when in doubt so here goes. I bought my "first" tunnel hull used off ebay a few months back and had problems bringing it up to speed. It's a 35" hull that looks like it might be a prather, not sure. It's got a 7.5 cc K&B motor and I couldn't seem to get it any faster than about maybe 30 mph it seemed. Not sure on needle settings for this engine, no manual for it and I can't seem to find the manual on the internet for it. Engine looks like it has little run time on it and in very good condition. What prop and angle should I be running for this particular engine. Havn't ran it since then as I'm currently repainting it and building a new radio box for it since the guy who built it went silicone crazy on radio box and added a lot of unecessary weight. :unsure:

 

[Jerry Dunlap]

The boat is a Prather. You might try Prather's website: pratherproducts.com - there's probably a "contact us" link and they are usually pretty good about answering questions.

An Octura X447 balanced and sharpened is a good basic prop for this boat.

The engine is probably an older version of the K&B 7.5. When properly trimmed, the boat should run in the low to mid 40s.

JD

 

[EatMyShortsRacing]

Prather Lap cat III by the looks of it.....

Lap Cat II was 32" for 7.5cc

Lap Cat III was 36" for 11cc and above engine but a decent mod 7.5 may push it

 

[anthony_marquart]

I don't think it's a lapcat III. Not sure though. Seems like I remember the III being even bigger than Marks boat. He's really looking for prop depth and angle numbers here.

 

[EatMyShortsRacing]

Well the measurements for the boats are on the Prather website.

I am pretty darn sure after owning one of each that we are looking at a LapCat III