Monday, December 9, 2019

Hi Allen,

Sharing some of my work. I finally finished my radiator for the “Bill” engine. My friend is a gun engraver and made the small radiator badge with my last name sort of like you might have found in the early days on an old automobile like the Packard. Thought it was a nice touch.
I also included the magnetic water pump built from your father’s plans. The stand is a temporary stand until the whole engine, radiator and water pump are mounted. My Bill is 98% complete save for building the propane system. I’ve gotten sidetracked building a Beamer also from your father’s plans.

Anyway, have yourself a Happy Holidays.

Matt Parker


Hi Matt,

Very cool!  Looks like the project is coming along nicely.  Be sure to
send photos when it's complete.

Thanks for sharing, and a Merry Christmas to you and yours also!


Thursday, July 18, 2019

Missing dimension on Throttle plans?

Q: Hi Allen.  I recently purchased plans for the 2 Jet throttle carburetor.  On page 2 in the front view, hole # 5 & 6 I need a location for.   I couldn't find it on the drawing.  Is #6 hole for the set crew for the spray bar?  I understand that the carburetor can be enlarged for bigger engines.  What formula do I use to enlarge it for a 2 1/2" bore slow speed engine?  Thanks for your reply - Norman Stauffer

A: Hi Norm.  If Dad were still alive, I'm sure he could definitively answer your questions.  I was a computer programmer/analyst by trade, but do have some mechanical skills, so I'll give it a try:

I believe hole#5 location is shown in the "Left Side View", the center being .270" from the top, and .505" from the bottom.  Hole#6 is simply aligned with hole#5 and drilled all the way thru.

I must admit these plans are a bit of a challenge to visualize because of the odd shape, plus all the holes and passages.  I surmise that once you build the main "block" and drill the large cylinder holes
that the smaller holes and details will be easier to ascertain.

To answer your last question, according to paragraph 2 of Dad's construction notes, the throttle bore should be 25% of the piston diameter, so for a 2.5" bore engine, the throttle size should be .625

Hope this helps...


Tuesday, April 23, 2019

Jerry's R/C PT-109 w/water cooled Wankel engine

John Wood from Grand Haven, MI purchased Jerry's PT-109 R/C boat he built in the late 60's / early 70's. John is a really nice guy, and he seemed impressed with the boat. I'm confident it will be in good hands and look forward to seeing it at the NAMES show.

True to his word, John displayed the PT-109 at the 2019 NAMES show in Wyandotte, MI:

Monday, January 14, 2019

1/3 scale Galloway engine


This is Adam Krichbaum,  I purchased the Galloway kit from you, that your dad had in his collection when I was at the NAMES show a few years ago.  I thought you might like to see some pictures of the engine.  I finished it last summer and although I did not paint it red I think it came out pretty well. Thanks for the opportunity to own this model.  It means a lot to me since Jerry owned it.  I met him a few times and talked to him on the phone a few times as well.  I have multiple ignition systems from him and I made the frame rails for the V4 engine that is on display at the Internet craftsmanship museum as well.  I also built the power house engine from his plans.  That was the first IC engine I ever built.

Thanks again. 

Adam Krichbaum

Saturday, January 12, 2019

ATV coil spark plug wire conversion

E-mail from Tim Mercer on how he replaced the large spark plug wire on the red Universal ATV coil with thinner high voltage plug wire.  Thanks for the tip Tim!


Hi Allen,

Here is how I converted from large to small high voltage wire.

Utilizing what is in the box I did the following:

  1. Cut off large plug wire approximately. 125 above the  black slip on weather seal.
  2. Remove by unscrewing off the internal stud. (These are easy and meant to do this to replace weather checked wires on ATV'S snowmobiles etc).  
  3. Pull out copper wires
  4. Strip white high voltage wire the same length of the black piece that was cut off and coat wire the FULL length with solder to stiffen it
  5. Thread white high voltage wire  through black piece so that it is even with the other end
  6. Use heat shrink tubing ( mine was blue).  Use a drop or two of water to use as lube to reinstall black weather seal, do not use oil, water evaporates  oil doesn't  

Hope this helps

Tuesday, March 27, 2018

Cor Rademeyer's completed Howell V-Twin

Hello Alan

As promised, hereby a link to the video of my completed Howell Twin 4-stroke.


Cor Rademeyer


Looks and runs great Cor.  Thanks for sharing!

Thursday, October 26, 2017

Hogan Half-Twin

I received this e-mail from Hogan Liechty back in Aug '17:

I am in the process of designing and building a single cylinder overhead cam 4 stroke model engine loosely based on the design concepts of Jerry's V-Twin.

I have not directly copied any of Jerrys designs but I have used them for inspiration.  Jerry's V Twin was the most difficult yet satisfying build I have completed.  Mine runs great.

Because it was so difficult to build the gear train and I wanted to try designing an overhead cam engine, I designed a single cylinder using Jerry's basic crankcase, cylinder, head, and flywheel concepts.  My final goal is to design a V-Twin OHC engine using the same concepts.

The obect of this e-mail is to give credit where credit is due. I have no desire to profit from my design work but would like to share it with the model making world.

I would be happy to give you a copy of my designs in PDF format and you can do with them what you want.  They are by no means ready to market on your web site since they are for my own shop use and are not fully detailed. If you want to complete them and make them market ready feel free to do so.  All I ask is aknowedgement  for the concept.

I am almost done with the build and will be trying to start my engine soon.  I have also shared part of my build on HMEM forum and have tried to give Jerry credit for the design concepts I have used.

I will attach a couple picture to show what I have done.

Please let me know if you want the drawings and will send them to you as soon as I have my engine running.

Hogan Liechty

Click on the photos below to enlarge.
Hogan sent me his drawings.  Click the link below to download for free or up to $5.00 donation.

Add to Cart

Great project.  Thanks for sharing, Hogan.