Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: parallelmotion on July 23, 2023, 02:53:11 pm

Title: Re: previously unknown early Jensen Model 20
Post by: parallelmotion on July 30, 2023, 06:50:24 am

Those are quite different from the one I have (had) other than the slide valve.

Title: Re: previously unknown early Jensen Model 20
Post by: SEUSA on July 29, 2023, 11:30:38 pm

Here are two of the 5.
The first ones original handles were missing ignore the big red ones... lol
The 2nd is the only No 20 De Luxe Power Plant know of.
They are all pretty unique.
Gil has a nice one with a ginormous boiler.
You have one.
Actually two others now that I think of it.
So 6 total that I am aware of.

Title: Re: previously unknown early Jensen Model 20
Post by: parallelmotion on July 29, 2023, 10:42:43 am

I think this makes the 4th known D slide valve example and each one is a little different. So yes, I'd say it's "pretty rare".

Title: Re: previously unknown early Jensen Model 20
Post by: SEUSA on July 28, 2023, 08:32:00 pm

I know of 5 of these.
Yes they are pretty rare.
They have a Slide D value.
Great Find.

Title: Re: previously unknown early Jensen Model 20
Post by: Fullraceflathead on July 24, 2023, 10:33:35 am

Wow what a great find!!!

Title: Re: previously unknown early Jensen Model 20
Post by: txlabman on July 24, 2023, 08:16:00 am

Another Jensen Unicorn.

What a great find Brent.

Congratulations!

Thank you for sharing the video.

Title: Re: previously unknown early Jensen Model 20
Post by: parallelmotion on July 24, 2023, 05:37:26 am

Thanks for your comments. I wasn't sure the dynamo needed remagnetizing (it seemed weak) but did it anyway to be on the safe side.

Title: Re: previously unknown early Jensen Model 20
Post by: skeptic49 on July 24, 2023, 05:32:30 am

Neat vintage engine, Brent. Did you have to re-magnetize the dynamo?

Title: Re: previously unknown early Jensen Model 20
Post by: Gregowen on July 23, 2023, 10:21:06 pm

  Really amazing, thanks for sharing!

Title: Re: previously unknown early Jensen Model 20
Post by: RedRyder on July 23, 2023, 08:05:44 pm

Great video and thank you for sharing it here. 
A superb find and an exceptional clean-up while bringing it back to life.

Very well done, Brent..!!!

Gil

Title: Re: previously unknown early Jensen Model 20
Post by: St Paul Steam on July 23, 2023, 07:44:36 pm

Geez....that hits all the rare,unusual & not seen before early type of Jensen build. Wow.....

Title: Re: previously unknown early Jensen Model 20
Post by: Stoker on July 23, 2023, 04:25:23 pm

Wow .... can't say that I've ever seen one configured quite like that!

Title: previously unknown early Jensen Model 20
Post by: parallelmotion on July 23, 2023, 02:53:11 pm

According to you Jensen experts, this machine is from the days when Tom Jensen Sr. was making toy steam engines in his basement shop in the early 1930s. It has the earliest slide valve gear. It is somewhat different from the very earliest known examples in that it has an in-line throttle valve and a 'hot plate' type round heating element. In this transitional example it is likely that Jensen adapted and used older components on hand as the boiler has a fitted plug where an earlier 'chromalux' cartridge heater could have been inserted and a plug in the steam line-to-valve chest junction block where the first throttle valves were located.

https://youtu.be/41hboGlJMNM