Model Boat Mayhem

Dry Dock / Shipyard: Builds & Questions => Springer Tugs => Topic started by: Norman Castle on September 22, 2015, 09:29:14 AM

Title: Power plant questions!
Post by: Norman Castle on September 22, 2015, 09:29:14 AM
(Post edited on account of) I've just been persuaded to buy this (http://www.ebay.co.uk/itm/281483657743?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT) motor for My First Springer.  I have no idea what ESC I'll need to go with it, so right now the plan is to connect it up to a 2S LiPo with the multimeter in series, stall the motor for a second, see what current the meter shows, then get the next size up ESC.  Or is there a better way?

And am I right in assuming that the prop I need is a 3-bladed 40mm?


 
Title: Re: Power plant questions!
Post by: Tug-Kenny on September 22, 2015, 10:22:05 AM
That motor is a 55 turn type and will be unsuitable for your springer.  The reason is that it will run slow.  I know, as I use this version for my Tamiya trucks so that they can be controlled gently when in company without rushing about all over the place. 

The size of the can is correct for a Springer but you need a faster running type, like a 600 and upwards.

The speed controller you are looking for will need to be rated at 15 amps and above, so any version would be alright, as long as you fuse the system.   Also any brass 3 bladed prop around 40mm diameter or above will work very well.

The fun thing about Springers is to experiment, as you can't really go wrong.

Cheers

ken
Title: Re: Power plant questions!
Post by: inertia on September 22, 2015, 11:10:34 AM
(Post edited on account of) I've just been persuaded to buy this (http://www.ebay.co.uk/itm/281483657743?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT) motor for My First Springer.  I have no idea what ESC I'll need to go with it, so right now the plan is to connect it up to a 2S LiPo with the multimeter in series, stall the motor for a second, see what current the meter shows, then get the next size up ESC.  Or is there a better way?

If all speed controllers were purchased to cope with motor stall currents then the market would be flooded with 50A-100A brushed ESCs. It isn't. As Ken says, any speed controller rated at 15A or above should do the job. Just make sure you fit a fuse between the battery and the speed controller (15A - 20A is more than enough). Just a word of warning; there is a particular ESC out there which is rated  50A continuous forward and 20A reverse and comes in a blue anodised case. From experience the rating is grossly exaggerated and the type has a poor reputation for reliability. Best to avoid.
For a motor and prop, have a look at the Springer board on this forum and see what the other guys are using.
DM
Title: Re: Power plant questions!
Post by: Norman Castle on September 22, 2015, 11:22:54 AM
Thanks gents.  Much obliged  :-)
Title: Re: Power plant questions!
Post by: Martin [Admin] on September 22, 2015, 11:37:13 AM

Just a word of warning; there is a particular ESC out there which is rated  50A continuous forward and 20A reverse and comes in a blue anodised case. From experience the rating is grossly exaggerated and the type has a poor reputation for reliability. Best to avoid.
DM


This type!

http://www.ebay.co.uk/itm/Marine-50A-Speed-Controller-ESC-WP-Water-Proof-for-RC-Brushed-Motor-Racing-Boat-/231312228705?hash=item35db488161
Title: Re: Power plant questions!
Post by: inertia on September 22, 2015, 11:48:40 AM
That's the one, Martin...............the Blue Meanie!