Paddle Power!!

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22 August 2019 at 14:09 #83537
John O’C
Participant
@johnoc
Hello All

With some spare wood and ply lying around I am having a go at a paddle powered Springer.

Haven't a clue why or how!!

Question:

I have a Turnigy D3542/5 1250KV Brushless Outrunner Motor still in its box and need to drop the RPM to around 200 to 300 RPM me thinks. Anybody got any ideas on the best way to achieve that considering I only have 18" by 8" hull size.

Cheap isn't a priority but it would help.

All assistance (and abuse) gratefully received.

John
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22 August 2019 at 14:09 #4602
John O’C
Participant
@johnoc
An inbetweeny Job
22 August 2019 at 16:34 #83538
Colin Bishop
Moderator
@colinbishop34627
You won't be the first, the late Ken Churchill built a very successful one a while back.

Colin
22 August 2019 at 18:02 #83541
Dave Milbourn
Participant
@davemilbourn48782
John

I've just had a brilliant idea! Why not sell me that motor and then buy something a little more 'appropriate'? After all, you'll have a job finding a gearbox of 50:1 or higher which will take that amount of power and fit in a springer hull. And then there's the little matter of driving two paddles…

PM me if it sounds like a plan to you.

Dave M
22 August 2019 at 18:43 #83543
John O’C
Participant
@johnoc
Thanks for the picture Colin . It is exactly what I have in mind.

Dave

You may have an idea there but what will I need?

John
22 August 2019 at 18:49 #83544
Dave Milbourn
Participant
@davemilbourn48782
John

I'd suggest looking at MFA's range of geared 540/1 brushed motors here MFA Geared Motors

Look at the second link from the top of the list and the table of shaft speeds.

Dave M

Edited By Dave Milbourn on 22/08/2019 18:50:25
22 August 2019 at 18:55 #83545
John O’C
Participant
@johnoc
They look ideal Dave.

I thought the 919D501 may do the job.

J
22 August 2019 at 19:27 #83546
Dave Milbourn
Participant
@davemilbourn48782
That depends on the supply voltage, John. On 12v that looks the kiddy BUT you have to take into acount the space available for a 12v battery. I've replied to your PM.

DM
22 August 2019 at 19:45 #83547
Colin Bishop
Moderator
@colinbishop34627
I know Dave doesn't like SLA batterieson principle but this seems one instance when it could be a cheap and cheerful solution

Colin
26 August 2019 at 00:06 #83597
Bill Michaels
Participant
@billmichaels85035
Some resources that will likely help:

Check out Ivor Bittle’s paper on building model paddlewheels: **LINK** You want paddles to spin at 150-200rpm, with only 5 or 6 paddles per wheel.

Also take a peek at Glynn Guest’s post on making paddlewheels from styrene- posted here:

**LINK**

I am working on a paddler project- I found a lot of useful parts on robotics supply sites- places like ServoCity or RobotShop.

-Bill
26 August 2019 at 14:25 #83608
John O’C
Participant
@johnoc
Bill

Many thanks for that. Loads of information that will help hugely.

I am going to try 2 motors initially, one for each paddle. That is when I have built or sourced the paddles.

I will get reading and see how it goes.

John
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