Model Boat Mayhem

Mess Deck: General Section => Model Boating => Topic started by: zetec on January 25, 2007, 03:41:37 pm

Title: 1 motor or two?
Post by: zetec on January 25, 2007, 03:41:37 pm

I'm looking to build a 38" seaplane tender. Now the big question is do I fit two Graupner 600 Ecos, or one 700bb turbo. I know either will given a very unscale speed, which is just fine by me. I suspect both will require the same batterys, 2 X 8.4v 3300mah to give 20-25min run time. So what are the pro/cons? Not too bothered about the cost side as there is not that much difference.

I fancy the twin motor route as I've only done single motor models so far...

Title: Re: 1 motor or two?
Post by: Glyn Cleaver on January 25, 2007, 03:51:33 pm

Don't worry too much about the pro's and con's. Go with your gut instinct and build what you fancy and the end of the day it will be your model built by you, don't worry about what other people think.
Just Enjoy it  ;D

Title: Re: 1 motor or two?
Post by: Bunkerbarge on January 25, 2007, 05:25:11 pm

There are plusses and minuses for both.

With two motors you have the option of controlling them independently so you can do more interesting manoeuvreing and get involved with mixing for more interesting turns etc.  Plus if you supply them with a seperate battery, as I have done with my Deans Marine Cossack,you will always be able to get her home if one side fails. The down side is the the two could well never be exactly in synch as they will have thier own speed controllers and you will need an additional channel on the radio and another speed controller.

One motor has the advantage of always being perfectly synchronised but the shafts, of course, then have to work together.  They only need one speed controller and one radio channel.  The  disadvantages are that they will have to use a gearbox, with it's inherent losses and noise generation, and if anything goes wrong with the speed controller you will have to recover the boat.

At the end of the day there are no right and wrongs it is entirely up to you to choose what you prefer to do.

I hope that this helps.

Title: Re: 1 motor or two?
Post by: J.beazley on January 25, 2007, 05:41:16 pm

If it helps i personally would go for the twin motor set-up and have each motor on its own channel so you can turn near enough on its own axis.

go with what you thinks best  ;D

Jay

Title: Re: 1 motor or two?
Post by: Shipmate60 on January 25, 2007, 10:34:00 pm

My preference is for twin shafts.
Yes more weight and expense but more manouverability and stability with no torque reaction.
This is just my preference.
It is your model, go with your gut feelings.

Bob

Title: Re: 1 motor or two?
Post by: Ghost in the shell on January 25, 2007, 10:42:42 pm

well id go for the insurance of two motors, that way even if one prop stops, you can still get home!