DaVette Aspect Shallow 42" Hull - New Build - Motor selection and misc. help needed

[mtbenjamin77]

I finaly got all the hardware. Here is a pic of what will be installed on the boat.

nice hardware speedmaster makes high quality parts. Is that a .187 flex shaft and a L42x55 prop?

[gyrotron]

Yes it is a spare L42x55 I had around but I am planning on using an M545 for starters.

[gyrotron]

Parts look great. Did you make a choice on the ESC yet. What is the wattage rating on your motor. I am still trying to figure which esc to get too. Also, I started a build thread. Search 42" custom mono with 56110.

The max wattage rating on the AquaStar motor is 5280w which is equivalent to approx 7Hp (5280w / 746 = 7.077 Hp) I haven't decided on the ESC yet. I'll keep an eye on your build thread.

[mtbenjamin77]

Yes it is a spare L42x55 I had around but I am planning on using an M545 for starters.

Too small you need something more like a 55mm and up. And that flex shaft is too small you need a 1/4" flex. I have a 4082 motor in a motley crew and it twisted a 3/16 187 shaft.

[gyrotron]

Too small you need something more like a 55mm and up. And that flex shaft is too small you need a 1/4" flex. I have a 4082 motor in a motley crew and it twisted a 3/16 187 shaft.

mtbenjamin77,

Where you using a teflon liner in your Motley Crew? I have heard similar stories like yours but when using .187 and teflon liner. I wont be using liner in this application.

[mtbenjamin77]

mtbenjamin77,

Where you using a teflon liner in your Motley Crew? I have heard similar stories like yours but when using .187 and teflon liner. I wont be using liner in this application.

that depends on the stuffing tube size. I was running 1/4 stuffing tube so no liner

DSC03000.jpg

[gyrotron]

that depends on the stuffing tube size. I was running 1/4 stuffing tube so no liner

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mtbenjamin77,

Wow. totally twisted. Did you check on the motor shaft alignment vs the stuffing tube? How much space did you leave between bottom of strut and the drive dog when changing the flex shaft from .150 to .187 on your Motley Crew? For a .187 flex it is recommended to use a 9/32" stuffing tube and you were using 1/4". Just curious about the cause of the incident.

[mtbenjamin77]

mtbenjamin77,

Wow. totally twisted. Did you check on the motor shaft alignment vs the stuffing tube? How much space did you leave between bottom of strut and the drive dog when changing the flex shaft from .150 to .187 on your Motley Crew? For a .187 flex it is recommended to use a 9/32" stuffing tube and you were using 1/4". Just curious about the cause of the incident.

I built the boat for a friend and the driveline was installed correctly. The problem was caused by failure to properly maintain the driveline. The owner failed to lubricate the flex and propshaft whiched caused the stuffing tube to wear abnormally. The boat struck a submerged object and twisted the flex and broke the strut.

If you're only going to run a 42mm prop then the 3/16 187 might be okay but with a prop that better suits that hull you should prolly use a 1/4"

[gyrotron]

I built the boat for a friend and the driveline was installed correctly. The problem was caused by failure to properly maintain the driveline. The owner failed to lubricate the flex and propshaft whiched caused the stuffing tube to wear abnormally. The boat struck a submerged object and twisted the flex and broke the strut.

If you're only going to run a 42mm prop then the 3/16 187 might be okay but with a prop that better suits that hull you should prolly use a 1/4"

mtbenjamin77,

I appreciate your comment. I did my research and I will follow your suggestion and go with a 1/4" drive system and strut to be comfortable on the safe side. Chances are I'd be moving to a bigger prop later on.

[mtbenjamin77]

mtbenjamin77,

I appreciate your comment. I did my research and I will follow your suggestion and go with a 1/4" drive system and strut to be comfortable on the safe side. Chances are I'd be moving to a bigger prop too later on.

sounds good my friend, keep us updated Cant' wait to see some vids.

[gyrotron]

Here is a picture of the preliminary motor layout mock up and hatch hold in place system will secure later on with Keithbradley's lock down kit. The 1/4" flex shaft has already been cut to 13 3/8" length. The cross bracing is temporary.

[mtbenjamin77]

Looks good, I really like that T-bar. Where'd you get that?

[gyrotron]

Looks good, I really like that T-bar. Where'd you get that?

mtbenjamin77,

The motor mounts I got from here:

http://southriverrcboats.com/shop/category_5%2522%2520rails/5%22-Rail-Mounts.html?sessid=dt8fzITvHHNwphPB6afLF6nHHLR7r5Y4BGeCBHdxWwbXLZswTBow1P8YkJ2hvFwB&shop_param=cid%3D%26

and the T-bar you can get it at Gizmomotors.

I've got new pictures of the boat build progress. The height of lower part of the motor towards the transom had to be corrected and raised 3/4" above hull floor measured from the cooling jacket not the motor can. Dana finished installing the hardware and servo mount. Next up transom fittings and water outlets. P.S.: The propeller shown on the pictures is just a place holder for now until I get the X455 or X457 /3.

[Diegoboy]

Looking good!

[gyrotron]

Looking good!

Thanks Diego. Here are pics of the transom fittings (located above center lines of strut bolts) and waterlines running above rails with a straight section made of alum tube. Alum brackets will be provided to fasten the alum tube to the rails. I am thinking about decreasing the rail's height towards the transom to allow for better access to hardware maintenance/replacement if need be.