SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Dec 21, 2011, 06:51 PM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
Mini-HowTo
EP-1 outboard weight reduction

I am working on a project that required a lighter EP-1 outboard motor so I put mine on a weight reduction plan.
As it comes there is a honking big 550 for power up top.
It weighs in at 8.4OZ.
My plan is to install a smaller but more powerful brushless motor.
I really am not going for the extra power but hey!! I will take it!
The motor I installed is only 2.4OZ has 150% more power and is about the size.
The EP-1 is set up for the wider 25MM mounting width for the bolts and the brushless was a 16MM so I needed to make a mounting adapter.
This was OK as I wanted to add some water cooling and the adapter was the best place for that.
The motor will cool through the aluminum of the EP-1 lower end as well.
The adapter was made from K&S flat stock with some soft brass tubing silver soldered to it. I have a drawing of the adapter I made in PC paint.
The motor I chose is a BP H2217-4 from BP hobbies. I have used these motors before in boats because they come with a 1/8 shaft where most are only 3MM. The mounting face is on the front as well which make it easier to install.
It has great power for its size and the price is good too.
I tested the motor today in a container of water and no vibration or problems could be seen.
I will run the three motor wires out where the stock two exit along with two cooling hoses for the ESC.
It only took me less than a day to do the conversion and now the EP-1 only weighs in at 10.8OZ.
It is noticeably lighter in your hand and should work great in my project. Dave.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 21, 2011, 07:52 PM
Registered User
Tollytime's Avatar
United States, MI, Macomb
Joined Nov 2006
1,261 Posts
That's what I'm talkin about! Very cool! what's the KV rating? Careful, those brass gears are not strong at all.
Tollytime is offline Find More Posts by Tollytime
Reply With Quote
Old Dec 21, 2011, 08:44 PM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
3500 RPM per volt.
I will only run a two cell pack so the power will not be much more than the stock motor.
It can do 250 watts at full voltage. Dave.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Old Dec 21, 2011, 09:47 PM
FROM THE MIND OF A MADMAN
gpzy's Avatar
United States, CA, Los Angeles
Joined Apr 2007
3,266 Posts
Nice, I am going to need to do this for a boat I have.
gpzy is offline Find More Posts by gpzy
Reply With Quote
Old Dec 21, 2011, 11:45 PM
Registered User
Pirt12's Avatar
United States, WA, Hoquiam
Joined Aug 2011
109 Posts
Very nice! I may convert a couple of EP1's (I have 3) for a project I'm thinking about....
Pirt12 is offline Find More Posts by Pirt12
Reply With Quote
Old Dec 22, 2011, 12:12 AM
Taking care of the pond.
MILLERTIME's Avatar
USA, CA, Fresno
Joined Apr 2004
7,301 Posts
Neat....
MILLERTIME is offline Find More Posts by MILLERTIME
Reply With Quote
Old Dec 22, 2011, 12:23 AM
"Take the Cannollis"
Steve Bad's Avatar
Lake Martin ALABAMA
Joined Feb 2006
877 Posts
I applaud your zeal in trying to shed the weight.....

But if the original problem was simply to balance a rear-heavy boat, ( You didn't really specify why you needed to shed weight, but you said you were not looking for extra power) it probably would have been easier to just graft blisters onto the boat's underwater aft hull to increase the buoyancy in that area. Did you nix that option ?
Steve Bad is offline Find More Posts by Steve Bad
Reply With Quote
Old Dec 22, 2011, 07:55 AM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
Quote:
Originally Posted by Steve Bad View Post
I applaud your zeal in trying to shed the weight.....

But if the original problem was simply to balance a rear-heavy boat, ( You didn't really specify why you needed to shed weight, but you said you were not looking for extra power) it probably would have been easier to just graft blisters onto the boat's underwater aft hull to increase the buoyancy in that area. Did you nix that option ?
You are correct Sir!
I did not mention the project boat.
But all will become clear when you see the craft as weight not just in the rear will be a big factor.
Think hydrofoil. Dave.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Old Dec 22, 2011, 08:49 AM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
462 Posts
Dave,
Like a vintage style hydrofoil? Something like this would be COOL!!!
Do you ever get up this way (1000 Islands)?
- Scott
Chinewalker is online now Find More Posts by Chinewalker
Reply With Quote
Old Dec 22, 2011, 09:54 AM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
Hi Scott,
That is really cool but more like this.
Mine is 1/6 scale with a Gi Joe driver.
Will start a build post soon.
It is almost done. Dave.
BTW-I have been to the islands many times but not in a few years.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Old Dec 22, 2011, 10:40 AM
GILL
GILL RC's Avatar
United States, NJ, Hopatcong
Joined Aug 2005
2,575 Posts
Now that's a net looking model.
GILL RC is online now Find More Posts by GILL RC
Reply With Quote
Old Dec 22, 2011, 12:43 PM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
Scott,
Did you ever pursue the scale engine covers for the EP1? Dave.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Old Dec 22, 2011, 01:33 PM
Grumpa Tom
Kmot's Avatar
United States, CA, Los Angeles
Joined Sep 2003
23,327 Posts
Might wanna stock up on those brass gears.
Kmot is offline Find More Posts by Kmot
Reply With Quote
Old Dec 22, 2011, 01:41 PM
Registered User
Chinewalker's Avatar
1000 Islands, NY
Joined Dec 2009
462 Posts
Quote:
Originally Posted by Subdave View Post
Scott,
Did you ever pursue the scale engine covers for the EP1? Dave.
That's on my winter to-do list. Right now I'm waiting for my basement (where the shop is) to dry out a bit once the ground freezes.

- Scott
Chinewalker is online now Find More Posts by Chinewalker
Reply With Quote
Old Dec 22, 2011, 05:10 PM
Semi-Official Tinkerer
Subdave's Avatar
Rochester NY
Joined Mar 2005
825 Posts
My dockyard is in the basement as well.
It has been a bit KaKaKa cold down there.
Even with the space heater the cold goes right down to the bones.
Dave.
Subdave is online now Find More Posts by Subdave
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log BestOfferBuy .9-1.3Ghz TX Weight Reduction Atx_Heli FPV Talk 5 Dec 26, 2011 11:26 AM
For Sale DPI 1/4 scale Champ Boat w/K&B 11cc Outboard - NEW LOWER PRICE! Old_Skool Boats (FS/W) 0 Sep 18, 2011 01:23 PM
Discussion Weight reduction idea PLATINUM Pusher Prop Jet Models 5 Mar 20, 2006 08:34 AM
T-REX weight reduction pictures inside ChrisT88 Mini Helis 17 Dec 26, 2004 03:38 PM
Weight Reduction Techniques for Micro-Flight Greg Covey Parkflyers 9 Nov 08, 2001 05:08 PM