Hi All, I mounted my engine on the Cub J-3 per directions using the supplied motor mount and notice there is a little right thrust, is this normal? does the J-3 have right thrust? I didn't measure the amount, but there is a little. Thanks...Bill

Hi Bill,

I have been following (and replying to) some of the GP J3 Cub posts as I am also just beginning to build mine. I noticed a couple of days ago that mine also has quite a bit of right thrust. I did not take an exact measurement yet, however, it looks to be about 2 - 2.5 degrees. Unfortunately I cannot answer your question - I am not that experienced with cubs and I do not know if this is correct. I did go to the GP website and found no listing for the ARF with respect to right thrust, but they do list 2 degrees as the right thrust for their 60 size kit. Hope this helps. I will be curious to see what some of the more experienced members say in their replies to your post.

I am with TONJ are you with LVRC Club?

Regards,

Steve

Yup! LVRC and Tri County Wingsnappers in Lenhartsville, Pa. Rod Maier of LV tells me the Cub requires approx. 2 deg r-th so we're ok! I question the method the aileron control horns are attached, looks inadequate, but will try it. I'll be using the DuBro adustable horns for the rudder and elevator and I rigged up flex cable and a ball link for the throttle. I am using an OS LA 65 for starters, maybe later a 4 cycle. The LA requires a ball link to off set the tightness of the throttle arm. I'm medium glassing the bottom of the wing whenever I get around to epoxying it together. Get to me off list if you wish and we can trade ideas! Bill

Have you tried to contact hobby services ?... they are very helpful and will assist you if they can. I have 2 GP cub arf's and I have a OS 70 fs in one, At first I had some problems with the plane trying to right turn as soon as power was applied even with full left rudder I checked the wing incidence and the alignment again everything was straight I also checked the engine's angle of thrust I did notice that there was some right thrust but I don't remember how much.( It's was 2 year's ago )..After flying the plane a few times I noticed that when the engine @ the top of the compression stroke the prop was at about 12 o'clock so when the engine fired the weight of the prop tip was at 9-10 o'clock position I changed the position of the prop 90 deg clockwise and the plane tracks straight without any right tracking. I did'nt like the plane at first now it is one of my favorite's . It is on ski's now and will be on float's this summer...The la 65 you are going to use will be sweet and I think you will like the plane ...good luck and have fun ...JW

Mr. Autoguns, Thanks I researched this and the r thrust is built in and normal. Are you into shooting? (autoguns?) I shoot Bullseye competition and other disciplines as well. Bill

Hi Bill ,Ya I'm into gun's to say the least I have built some good shooter's mainly in .223 .308 & 50 bmg...One of the REM .223 PSS's shot so good the Anchorage PD wanted it for there CIRT team I shortened it from 26" to 20" and threaded it for a can ,It's very quiet with 3000' per second ammo and with sub sonic ammo it sound's like a pellet gun ...I also do alot of work on class 3 gun's (such as machine gun's supressor's and SBR/SBS ecc.) it has been a hobby of mine sense 1983.... Lately it has taken a back seat to plane's LOL...so many thing's to do,so little time....JW

Time...I know what you mean. I shot Bullseye for 10 yrs. but have quit competing due to work, time, etc. but I still shoot weekly for practice. In fact my buddy from work and I spent the afternoon at the range today, I have a Les Baer done up Colt 1911 (45 ACP), and brought the Ruger Super Blackhawk 44 mag. for some exercise, also took an SKS just for kicks. Also a couple of 22s, a Makarov and some other toys. I don't do much shooting during the flying season, but when it gets cold and snowy, the planes go on the rack and out come the irons! Bill

Yes, the cub needs about 2 or 3 degrees of right thrust. This is true for most planes with an airfoil wing.

Thank you all for the right thrust information on my J-3 ARF. Now if I can only finish it, and if all this lousy snow will melt and warm up! Bill

I know what you mean , I havent been out shooting much lately , I have to get back into it before summer hit's ...We like to go out and shoot at ice burg's, that is allot of fun ...M16 c-beta mag with tracer's is alway's a crowd pleaser...Here is a couple of pic's of mt m16 w/can Rem PSS w/can and my springfeild m-14 e2...Talking to you i'm gettin the bug again ....LOL ... The PSS is the one I did the machine work on ....Note the guard dog ...He's blind ...Cya ....JW