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Building Tips and technical articles. => 1/2 A building. => Topic started by: Andrew Tinsley on January 01, 2014, 03:43:43 PM

Title: Info required on some old small glow engines.
Post by: Andrew Tinsley on January 01, 2014, 03:43:43 PM

Hello everyone,
I have just been going through some old 1/2A stuff. I have an old Wen Mac Mk 12 without a needle valve. Does anyone know the thread on these NVs? I believe them to be the simple wire type with a thread cut on them. Impossible for me to measure the tpi on the inside of the spraybar. Can anyone help?
I also have a couple of OK cubs. The first is an 0.99 in excellent shape , just requiring a prop bolt. Being based in UK, I don't have many small US standard bolts, so does anyone know what size prop bolt this takes?
The other OK engine is a bit of a mystery, it has 0.6 (yes 0.6 NOT 0.06!) cast on the bottom of the crankcase. It also has a spring starter (defunct) and no prop bolt again (size? it looks a tad smaller than the 0.99 bolt). It has a simple metal tank on the back and the extended venture and it is FRV. Nothing in the Tim Dannels Encyclopedia seems to fit this beast, unless it is really an 0.049 or an 0.074 in disguise! So if you can identify the prop bolt size and tell me if the spring starter can be repaired (I am fairly handy at repairs!).

Happy New Year,

Andrew.

Title: Re: Info required on some old small glow engines.
Post by: Bill Adair on January 01, 2014, 06:57:42 PM

Hi Andrew,

Trust you had a wonderful Christmas, as we did here.

I'm pretty sure I have a NIP needle valve that will fit your Wen-Mac engine. Since you have helped me a great deal with PAW engine parts, it's the least I can do for you.

If anyone knows the OK .099 screw size and will reply here,  I'll include a package of those as well.

Happy New Year to you and your family!

Bill

Title: Re: Info required on some old small glow engines.
Post by: Andrew Tinsley on January 02, 2014, 01:19:06 AM

Hello Bill!
A very happy new year to you and your family! Thanks for the very kind offer of a needle valve for the little Wen Mac. I think I am going to try a Nelson Turbo plug in a modified head if I get carried away with this little engine!
  Seems a pity not to use these engines, so building is going ahead to give them an airframe to fly in. Grandchildren are a great excuse (er, ...... I mean reason!) for a little more building.

Thanks and a happy New Year!

Andrew.