Model Boat Mayhem

Technical, Techniques, Hints, and Tips => Engineering Techniques and Materials. => Topic started by: rayna on November 12, 2018, 11:32:35 pm

Title: motor pods
Post by: rayna on November 12, 2018, 11:32:35 pm

Any links to making self contained swiveling propellor power pods like cruise liners and some rig supply vessels now use.
With small outrunners of significant power should be an optioin for clever laddie to build??
Ray

Title: Re: motor pods
Post by: dreadnought72 on November 13, 2018, 07:59:41 am

There are challenges with totally waterproofing the stern gland to keep the pod internals dry - so maybe don't bother? Mount the motor vertically above the rotational axis of the pod, above the waterline, and use bevel gearing to a (permanently wet) pod. I guess that's been done?


Andy

Title: Re: motor pods
Post by: JimG on November 13, 2018, 10:53:58 am

If you need to mount the motors in the pod then use brushless motors, won't matter if the pod is dry or not. Even brushed motors will run in water. You may have problems in salt water but normal fresh water will be OK. If the motors use ball bearings then make sure they are sealed types.You would probably need to run smaller props as the extra drag of running in water will increase the load on them.As for mounting the motor in the hull and driving through gears then Schottle drives have been around for some time.
Jim

Title: Re: motor pods
Post by: Tug Fanatic on November 13, 2018, 01:47:56 pm

Everything that you want to know is here:
https://www.rovworld.com/forum-15.html (https://www.rovworld.com/forum-15.html)



try this thread for starters:
https://www.rovworld.com/ftopict-8587.html

Title: Re: motor pods
Post by: TomHugill on November 13, 2018, 01:51:07 pm

Quote from: dreadnought72 on November 13, 2018, 07:59:41 am

There are challenges with totally waterproofing the stern gland to keep the pod internals dry - so maybe don't bother? Mount the motor vertically above the rotational axis of the pod, above the waterline, and use bevel gearing to a (permanently wet) pod. I guess that's been done?


Andy

Us model submariners manage it on even the most tiny boats so.i.dont see why it's an issue or why you'd want to add a complex bevel drive.

Title: Re: motor pods
Post by: Subculture on November 13, 2018, 07:02:53 pm

Fundamentally, the problem producing azimuth pods in model form without using bevel gears, is that you end up with a very large pod for a motor with sufficient grunt to turn the prop. This can hinder performance and look totally out of scale. Larger scale models can probably get away with it, but the smaller boats are going to be at a disadvantage.

Title: Re: motor pods
Post by: rayna on November 13, 2018, 08:58:12 pm

 :-)) Thanks for replies to date. Lots to think about. Unfortunately the ROV ones are too large but concept is there.
Keep em coming thanks
Ray