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

The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc => Topic started by: ShadetreeMotorcycle on March 28, 2021, 09:14:49 pm

Title: M90 hit n miss compressed air conversion?
Post by: ShadetreeMotorcycle on March 28, 2021, 09:14:49 pm: I ran across this video of a hit and miss engine that runs on compressed air.
It does "miss" and sounds pretty good!
There are free plans to build it, but the very first thing I thought was how it looked like an air cooled version of M90.
I have so many projects going, the thought of machining an entire engine again is a bit off putting(right now) BUT the magic is a clever valve in the head. Got me thinking it would be Big fun to just make an "air-head" for an M90! I have not looked into the details but wouldn't it be nice to just bolt a self made head on your M90 and run indoors on compressed air? And be able to covert back to Zippo fuel head in minutes?
Just thought I would throw the idea out there in case someone wants to give it a go
( before me)

https://youtu.be/iHyCNKDtz9s
Title: Re: M90 hit n miss compressed air conversion?
Post by: 70Rcode on March 30, 2021, 10:18:00 pm: Sounds more like a "hit,hit,hit,hit...miss" air powered steam engine ! .....I'm used to the gas & spark h & m sounds indoors.....but air fired might be someone's thing....Thx for sharing, .....tom
Title: Re: M90 hit n miss compressed air conversion?
Post by: cheepo45 on March 31, 2021, 07:18:26 am: Here is a video of this engine after I got it sorted out.
It was one of my most fun builds.
It will run all day at the shows without needing any attention - unlike the IC Hit and miss engines!
I do like the idea of interchangeable heads for the M90.
Scott
https://www.youtube.com/watch?v=o-MllMN0dw4
Title: Re: M90 hit n miss compressed air conversion?
Post by: RedRyder on March 31, 2021, 09:14:23 am: Love it!
Title: Re: M90 hit n miss compressed air conversion?
Post by: Nick on March 31, 2021, 09:24:47 am: That is an awesome setup Scott! 8)
Title: Re: M90 hit n miss compressed air conversion?
Post by: ShadetreeMotorcycle on March 31, 2021, 10:01:03 am: It sounds cool, and pairs nicely with that marble run...I got to get one of those pretty soon. Thanks for sharing the video!
Title: Re: M90 hit n miss compressed air conversion?
Post by: Jim on March 31, 2021, 06:12:44 pm: And great for running inside with no fumes :)
Title: Re: M90 hit n miss compressed air conversion?
Post by: MasonvilleEngines on April 02, 2021, 01:16:32 pm: Cool set up, this came up in my feed after watching this vid, like the idea of a quick change head.

Len.

https://youtu.be/CXH2nNLmBXo
Title: Re: M90 hit n miss compressed air conversion?
Post by: txlabman on April 03, 2021, 10:23:06 am: Quote from: cheepo45 on March 31, 2021, 07:18:26 am
Here is a video of this engine after I got it sorted out.
It was one of my most fun builds.
It will run all day at the shows without needing any attention - unlike the IC Hit and miss engines!
I do like the idea of interchangeable heads for the M90.
Scott
https://www.youtube.com/watch?v=o-MllMN0dw4

Very nice build Scott.
Title: Re: M90 hit n miss compressed air conversion?
Post by: classixs on April 03, 2021, 01:11:43 pm: Sure is a cool engine Scott, well done!

Just subscribed and went through your YouTube channel, and wonder how the hit&miss is controlled on the two-stroke Jan Ridders there?
Title: Re: M90 hit n miss compressed air conversion?
Post by: cheepo45 on April 05, 2021, 08:24:09 am: The hit and miss mechanism on the Jan Ridders engine uses a weight and a spring to pull the hall effect trigger magnet away from the sensor as the RPM's rise.
I got the idea from working on Fiat automobiles in the 70's - they had this type of arrangement on the distributor rotor as an RPM limiter.
I had trouble with the engine running away as the fuel level dropped - so this was my solution.
Scott
Title: Re: M90 hit n miss compressed air conversion?
Post by: RedRyder on April 14, 2021, 07:26:56 pm: I have seen Scott's Hit & Miss steam or air engine up close at Rough & Tumble. It is a really neat piece.

Gil