AP WASP THREAD SIZE .061

[Dick Byron]

Anyone help on the thread size fort the AP Wasp .061 crank shaft.

[ash]

I just bought one so I can check when I get home. Off the top of my head I'd say M5.

Would be keen to hear what kind of prop/fuel/model combos these have been used with. 1/2A power free flight or a 1/2A sized Novi III are on my menu.

[John Crocker]

I've got 2 and had 3.  Mine LOVE Power Master 20/20.  APC 6x2 is the preferred standard prop, 6x3 pulls a little harder, but you lose some speed.

Couple of recommendations. 

1:  Take them completely apart when you get them and clean the factory junk out.  There usually some leftover filings.

2:  Very important unless you wanna buy parts later on.  Loosen the carb/venturi screws a couple of turns and put some CA/Loctite on the threads and retighten.  Check them about every 3 runs to make sure they are still tight.  I lost mine on the first engine, had to replace.

3:  The throttle is very responsive and I have used it on a 3 line carrier type plane, but in most cases I lock the throttle wide open with a paperclip bent into the linkage and wrapped around the cylinder.

I've been very happy with the results.  For a $45 engine it seems to perform beautifully.  They seem to take licks pretty well (although I did destroy one on concrete) and if run on pressure (bladder or tank) make a pretty decent little combat engine ( I eat my buddies lunch when he flies against me with a Golden Bee).  I tend to use a modified Norvel 1/2 oz tank, or a Sullivan 1 oz clunk type tank depending on the model I'm flying.

Glow Heads are around $5 each, and supposedly a Galbreath or Nelson head will fit for standard plugs, but I have not gone that route.  I do know a Norvel Freedom plug is too large for the head unless you plan on drilling it out (did this with my damaged ones head and keep it just in case) 


Note, it is no Fora or VA, but for the price you cant beat em.  I plan on buying a couple more.  I usually put mine on a plane with at least a 30" wingspan around 8-9 oz and the AP's pull them with authority on 45' lines running somewhere between 50 and 60 mph according to my neighbors radar gun (he's a cop, read my "Speeding" thread)

[Dick Byron]

Thanks for the info. I just cleaned the 2 I got today. Not to bad inside buy a very necessary thing to do. I hope to use them on a KI 45 1/2 a scale profile ship. I hope somwebody can find the thread size of the shaft.

[ash]

Sorry its M4 on the Wasp (06), M5 on the Hornet (09).

[ray copeland]

Hey Dick, i use one on a 1/2a foamie with a balloon tank and it runs pretty good and the balloon filled with about 3/4 oz. runs a lot longer than the norvel tank mount. I did take the r/c carb apart and remove the throttle arm and centered the needle more in the venturi and that added a few hundred rpm's. Also i run a standard cox .049 glo head on mine and only 1 glow head washer and 6x2 apc prop most of the time.