Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Steam => Topic started by: handlebarbob on May 22, 2014, 11:56:41 pm

Title: Pittman Arms for Paddle Wheel
Post by: handlebarbob on May 22, 2014, 11:56:41 pm

Hello,

I am currently building a 48 inch stern wheeler and powering it with steam. The paddle wheel is 5 inches in diameter.
What would be the size of the Pittman arms on the wheel shaft, from center of hole to center of hole?

Any help would be appreciated.

Title: Re: Pittman Arms for Paddle Wheel
Post by: derekwarner on May 23, 2014, 12:10:49 am

Bob......here is a link for a model stern wheel paddler being built with a steam engine driven........the WEB thread author will be able to confirm the eccentric dimensions........Derek

http://modelsteam.myfreeforum.org/about71413.html

Title: Re: Pittman Arms for Paddle Wheel
Post by: Umi_Ryuzuki on May 23, 2014, 04:51:40 am

You might see if you can contact Dave, Phoneman2005, regarding
his construction for this engine.

http://www.rcgroups.com/forums/showthread.php?t=1497645&page=82#post28447917

 :-))

Title: Re: Pittman Arms for Paddle Wheel
Post by: cos918 on May 23, 2014, 06:51:09 am

Quote from: Umi_Ryuzuki on May 23, 2014, 04:51:40 am

You might see if you can contact Dave, Phoneman2005, regarding
his construction for this engine.

http://www.rcgroups.com/forums/showthread.php?t=1497645&page=82#post28447917 (http://www.rcgroups.com/forums/showthread.php?t=1497645&page=82#post28447917)

 :-))

Have to agree with Umi , that build is great. have been watching it years.

john

Title: Re: Pittman Arms for Paddle Wheel
Post by: derekwarner on May 23, 2014, 07:11:48 am

 :o a chain drive via a converted DC drill does not have Pittman arms ....unless I am "blinded by the light".................. Derek

Title: Re: Pittman Arms for Paddle Wheel
Post by: handlebarbob on May 23, 2014, 12:51:06 pm

Thank you so much for all your replies.   I have enclosed a picture of the paddlewheel to hopefully help with my quest for the Pittman Arm dimensions.

Yes, derekwarner_decoy, it would be simpler to electrify, but if something is not difficult, it is not as much fun.  I am using a 1983 Maxwell Hemmens Cayton engine.  I could not bring myself to use a belt drive after all this work.  3 years in the making so far.

Title: Re: Pittman Arms for Paddle Wheel
Post by: derekwarner on May 23, 2014, 02:08:01 pm

 :o please re-read the post Bob....... >>:-(

1. I offered a link to a member who may be able to offer dimension's on eccentric links ...as this was your original request......
2. Any comments re an electric drive are not from my pen
3. My side wheeler build is also a direct steam drive ..........
4. My project is also near ten [10] years in construction.......
5. I am sure all fellow steam paddle modellers will be looking forward to your enlighten posts

 Derek

Title: Re: Pittman Arms for Paddle Wheel
Post by: handlebarbob on May 23, 2014, 02:22:45 pm

I stand corrected Derek.  Of course I will be contacting the poster you suggested. :-))

Title: Re: Pittman Arms for Paddle Wheel
Post by: AlexC on May 23, 2014, 03:49:34 pm

Hi Bob,
 
The attached PDF may be of some help... you will certainly need to reduce the Caton engine speed to drive a sternwheel.
But you will need the engine speed to be high enough to produce enough power... it's a bit of a balancing act. A reduction of 3:1 or 4:1 should be sufficient.

Paddlewheel speed needs to be around 100 - 120rpm MAX

Hope this helps.
 
Best Regards.
 
AlexC aka SandyC. :}

Title: Re: Pittman Arms for Paddle Wheel
Post by: hammer on May 23, 2014, 07:33:03 pm

Has Handlebarbob Got his crank & his pitman arm mixed up???

Title: Re: Pittman Arms for Paddle Wheel
Post by: handlebarbob on May 24, 2014, 12:06:06 pm

Thank you so much for all your useful replies! 
Now I will be able to do some fabrication!
I will post photos as it gets done!
Thank you again!
 :-))