motor mount bond

[Stealth Assassin]

Any good Ideas on how you would mount this to the hull?

http://www.offshoreelectrics.com/pro...=adj-540-mount

[JimClark]

I would glue a piece of square spruce .125X.125 or bigger to make a larger gluing surface on the bottom and epoxy it in place

[Darin Jordan]

Any good Ideas on how you would mount this to the hull?

http://www.offshoreelectrics.com/pro...=adj-540-mount

Derrick,

I just used one of those in one of the 1/10ths I'm working on... After laying in some carbon fiber refinforcement tubing... which framed up the motor mount area, I simply scuffed the mount a tad, put on some laminating epoxy, and set it in place... A couple pieces of glass along the joint might not be a bad idea either...

I'll post some pics later tonight... Seems to be very solid...

I did have to file out the center hold just a tad to fit the SV27 motor onto it, due to the diameter of the front bearing housing... but it didn't take much... Seems like a nice motor mount... I'll likely be using another one on my other 1/10th...

[Ub Hauled]

I am with Darin... some decent resin should do the trick... I am about to install one myself.

[Darin Jordan]

Here are the pictures I promised... The epoxy was MAS FLAG Medium Laminating Epoxy, unthinned and brushed on with an acid brush. All of the carbon, etc., was coated with it, then placed in front of a heater. This helps it to flow and and get into the nooks and crannies...

Motor mount was installed at the same time... Carbon is temporarily held in place with CA glue to get everything situated...

Hope this helps...

[JimClark]

In darin's mount the tubes are acting as the extra glue surface just as I describe.

[Darin Jordan]

In darin's mount the tubes are acting as the extra glue surface just as I describe.

A little engineering and planning goes a long ways...

[JimClark]

Sometimes things are over engineered too Darin. As long as you don't need all the extra strength the tubing add's then the simpler way will work just as well.

Jim

[Darin Jordan]

Sometimes things are over engineered too Darin. As long as you don't need all the extra strength the tubing add's then the simpler way will work just as well.

Perhaps... but I think you 1/10th scale guys build these things too light... (perhaps a reason why some of them sell off their boats at the end of every season?? ) I had to do something to make the tub less flexible... That tunnel changing shape all the way around the course with the motor is hopping around not only makes for an ill-handling boat, but it is tough on drivelines as well... I prefer things to be a lot more rigid. A few ounces of additional weight are more than made up for by the predictability and reliability of a solid setup... The tunnel is now FLAT, unwarped, and very solid enough to handle the power... All good!

I don't "overengineer".... I just engineer enough to be reliable and fast, and to survive the race season...


Having said all that... I guess I'd better hope this thing is still fast...

[JimClark]

Are you saying Marks boat flexes? Man that would surprise me. I know the boats I build are good and stiff especially under the drive train. You didn't end up with one of Pete's boats did you? Shoot I think the 1/16th scale boat I am building is going to end up being heavy also.

Jim

[JimClark]

How much does that motor mount weigh? I like the adjustment it offers maybe I should get one for the resurected 67 Bardahl. those are some trick fasteners to hold the motor in also. Are you using a thrust bearing at the motor?

jim

[Darin Jordan]

Are you saying Marks boat flexes?

The tunnel area was basically unsupported... The boat doesn't flex... it's good and rigid, but under the drivetrain was just the thin ply... Not a big deal... a little well-placed carbon tubing and some epoxy and it's good to go!

That mount is feather-light... Not much there to weigh anything... I'd use this style mount over the bent aluminum stuff if it will fit any day... Just supports the motor weight better...

[JimClark]

Ahh I ususlly double the thickness inder the motor and shaft plus leave a couple of frames intact to help stiffen the area.
I understand now
Jim

[Ctonez]

You didn't end up with one of Pete's boats did you?
Jim

I did - Mr. P's...wow is it light - too light if you ask me. I'm sure that's what you meant.
...seems like light contact would destroy this boat. I'm a bit scared to drive it for fear of getting it shredded - not that that will stop me. Tunnel Flexes a ton too.
Thanks for the pics Darin, I think I'm gonna have to reinforce the tub with CF like you did.

BTW - Jim were you at Stan Sayre's last week (or was it 2 weeks ago?) when Miss Beacon Plumbing was testing? ...I got some pretty neat detail shots of sponson shapes, turn fin angles, etcetera - a bunch of geeky stuff if anyone's looking...no good prop shots though.

[JimClark]

I was going to go on the tuesday but it got canceled because of weather and I didn't hear about the rescheduled date.

I am going on 4/15 though for the vintage and UL testing

Jim