Cox .049 specs?

Nevadablue Sat Jan 07, 2017 7:38 pm

I did search and didn't find. I am looking for a spec sheet for the Cox .049 engine or at least a few thread sizes.

- tank mounting screws
- prop screw/stud
- glow head
- cylinder

Bore and stroke would be useful too.

Any help or links appreciated.

Nevadablue Sat Jan 07, 2017 7:48 pm

I decided to start the document and have found this so far.

Cox .049 Specs

- prop screw
5-40 x 5/8

- Tank screws, short
2-56 x 3/4" Stainless Steel
.140 x .083 Slot - Fillister head

- Cylinder head thread
17/32-40

- Cylinder neck thread
17/32-40

- Bore
0.406 inches (10.31 mm)
- Stroke
0.386 inches (9.8 mm)
- Displacement
0.04997 cubic inches (0.8189 cc)
- Bore/stroke ratio
1.05:1 (Oversquare)

Ken Cook Sat Jan 07, 2017 7:48 pm

prop screw on .049 is a 5-40
tank screws are 2-56
Glow plug and cylinder is 17/32-40 this is a specialty tap
bore is .406 stroke is .386
I retained this info which was done by Mark Boesen who posted this on Stuka Stunt some time ago