UL-1 Prop

[jfrancisco892]

I am currently running a 42x55 grimracer and am looking for more speed as there is more room for propping up due to low electronics temperatures. I have run a m445 which the boat does not seem to like, a 40x57 3 blade which works but is difficult to get on plane and has similar speed and handling characteristics of the 42x55. Anyone have any suggestions on what to try next? I am thinking of trying an abc h4, prather s220, or a grimracer 42x66. Let me know what you think.

[jamie]

The H4 has fairly aggresive pitch watch your temps ... also why didnt the boat like the M445? where was your strut, angle, cog etc.

[jfrancisco892]

Does anyone know the difference between an h4 and a grimracer 42x66.

[longballlumber]

James,

I am pretty sure they are the same prop... The Grim 45X68 is the same as the ABC H5

Here is an ABC Prop Chart

http://abcprops.com/proppdf/PROPSHEET(1104).pdf

Later,
Mike

[jfrancisco892]

The H4 has fairly aggresive pitch watch your temps ... also why didnt the boat like the M445? where was your strut, angle, cog etc.

I have done a lot of changes since last running the m445, but it was very walky and had high temps. I may try it again sometimes but i feel i would have to run the strut very low with some negative angle. With smaller props it seems to be much more stable. Thats why i am looking for something in the 42mm range just to experiment with. My ul-1 is also highly modified so the strut position and angle is probably not comparable to other ul-1s.

[RandomHero]

go with the 45x68 i run it on mine but u need a better water pick up!

[jfrancisco892]

go with the 45x68 i run it on mine but u need a better water pick up!

I can imagine my motor exploding already. What water pickup?

[detox]

The simple x442 is allways overlooked. I like them sharp and thin. Try adding a little more cup at tips for greater speeds

Cup: I have my own very simple way of doing this. Others would probably laugh, but it works. No stupid special pliars, no ball anvil. All I use is a regular pair of pliars.

[dana]

I never had any problem getting mine to plane on l40/57/3. Thing was a rocket too...
How are your prop sharpening skills anyways?

[detox]

That prop is very difficult and time consuming to sharpen, but it is a good prop. To sharpen I use a strong pair of Walmart #3 reading glasses and take my time. Small course and medium files then polish with dremel.

[detox]

Thanks to properchopper it goes something like this (cupping tips).