California Build

my previous experiments with number of prop blades lead me to believe there is no measureable difference in thrust between three and four blade props.

Marty

 

Might as well build what you got. If you are like me, you probably will change it a bunch of times as you go...

 

When I finally stick with a prop pitch it will be after it is built.
But I think I will stick with the 1.25 props

 

I would go with 1.25 3 blade flat pitch Paul.Pitch will be 25 degree pitch.

 

The flat props I will order later. I will likely go for the 3 bladed flat pitch props. But also nice to have another set around

 

I may have a set available Paul that I was going to install on Tennessee. I'll check and see.

 

Good news. I have checked my parts inventory and I have a pair of 4 bladed 25 pitch props.

 

Great what size?

 

They are 1.25 inch props.

 

Perfect.

 

They will be used during the spring when I test the Tennessee on the water

 

Here of some pics of the gears and motors.

 

Question: why did you add the dogbones in the fashion you did? That's different than the usual method I see, so I'm curious why you did it that way.

 

The dogbones counteract the slight upward angle on the shafts.

 

I wondered on the dog bones with what appears to be the BC gear boxes. I just sanded the bottom of the gear boxes to the level that I needed for my Marlborough. That way I didn't need the universals at all. The shaft lines up with the motor just fine.

Other than that your build looks great.

Kim

 

Even if I sanded the bottom the gears, the entire housing would have to be raised. on one shaft I just have it shimmed with 3 pieces of 1/32 balsa so that it is almost inline. The prop shafts angle up so that is why I am using the dogbones.

 

I have the same gears in my Arizona (soon to come out) I like the way you keep the motor and the gear aligned and then mount the dogbone. i should have done that with mine. Gears save a lot of wear and tear on the components but I decided to go for a more radical battler. They were very dependable my first 5+ years and served me well. They do need a lot of maintenance to make sure they haven't come loose. Mine were constantly being adjusted. I liked the other style bc gearbox better for that reason. Much better, less worry and had dogbones.

 

So both wooden Motor Mounts have a hole drilled through so that the tie down can go through. The next step is to take some laquer to the wooden block to waterproof it. Or at least not have it rot out.

 

Paul I made my motormount blocks out of layered Sintra sections. Glued the sections to make a block sanded smooth then gouged the center to fit the motor mount then drilled through the mount for the tie down clamps. The best thing I don't need to waterproof the sintra.

 

True enough with sintra.a little waterproofing should keep it from rotting for a few years. After all I don't intend to sink