Trainer Match

[Dave Moritz]

Gents:

Attached is a built model given to me by a friend who is now in hospice care. He built it many years ago and never flew it (got bitten by the RC bug). I need to match it up with some kind of glow power. Suggestions are welcome.


Wingspan of 46" and weight (as shown) is 24 ounces. The large engines in my stash include: Saito 30FS, OS 20FP ABC, OS 35S, Veco 19BB. I do have a sweet OS 46LA already on a Twister, but would like to keep it there. If none of these works, plenty of swap meets coming up this Winter to find something with more snort.

The plane appears sturdily built, but some of the narrow Mono-coat wing edges are loose. Will probably just go with clear tape to keep them down if they won't iron on.

Thanks.

Dave Mo...

[jerry v]

Dave, OS.35S will work.
Because model is new and clean, you may consider to make it electric. Regular RC engine mount for glow, or rear mount electric motor can easily be attached to the existing firewall. Loose Monocote on edges can be glued with medium strength superglue after ironing flat. When superglue will dry, it can be polished with automotive polishing compound. It will look this way better than clear tape.

Jerry

[Dan McEntee]

  It looks like it's an Ugly Stik, Sweet Stik, or one of the many other variations that were produced over the years by different companies. The original was Das Ugly Stik by Phil Craft, I think, and was an R/C aerobatic trainer and all the other variations were very similar in outline, but could vary greatly in size!! These went from Cox.010 powered single channel pulse control all the way up to giant scale weed whacker engines and everything in between. I have always wondered ho it might fly as a sport control line stunt model. The R/C versions were mostly .40 size. The weight at 24 ounces isn't too bad but it's gonna be kind of draggy. I would Use the OS.35 at a minimum. Look for an OS LA or FP-.40 for it. Those can be found pretty cheap and set them up like guys are the LA.46 and they will run about the same. If I ever built one like this, I would make it a tack apart and rubber band the wings on, and key the wing in place to keep good alignment. I'm assuming he glues the wing on?? Here's hoping and praying for the best for your friend.
  Type at you later,
   Dan McEntee

[GallopingGhostler]

Believe it is the Das Liddle Stik, a smaller version of the Ugly Stick. Magazine article from May 1986 R/C Modeler and plan are available at https://outerzone.co.uk/plan_details.asp?ID=4952 . Article says Build it as a tail dragger, or trike geared; without diheral; with ailerons, without ailerons; six channels [reed or 3 channels] or full house; .19's to .45's. Later it was kitted by Midwest.

[Dave Moritz]

Thanks Jerry, Dan and GG for the responses. So, it is a CL version of Das Liddle Stick, keeping the Ugly Stick lines? I'll go with that!

Unless I'm wrong, it seems this critter might not be a top stunt performer. Once I get some power on it, I'll be able to tell, at least to my abilities. If nothing else it might make some very nice flying eye candy at a public event, perhaps with a long streamer or even and a retro banner ad pushing US War Bonds!

Dave Mo...

[Dan McEntee]

Thanks Jerry, Dan and GG for the responses. So, it is a CL version of Das Liddle Stick, keeping the Ugly Stick lines? I'll go with that!

Unless I'm wrong, it seems this critter might not be a top stunt performer. Once I get some power on it, I'll be able to tell, at least to my abilities. If nothing else it might make some very nice flying eye candy at a public event, perhaps with a long streamer or even and a retro banner ad pushing US War Bonds!

Dave Mo...

   I'm interested in how it goes also. The wing/stab/thrust layout is different from typical stunt models, so double check alignments. getting the fuel tank on the proper level is important. The lead outs look like they come out of the wing tips?  That may help, I think. Dick Mathis did a profile stunt model of the Citabria and the lead outs and bell crank were in the wing, and stab is below the wing on that model but not quite as much, and by all accounts I have read it flew rather well. I think making sure you have adequate power will be a help. With the R/C type engine mounts, you can swap out engines easier. If it were me I would still go with an LA.40 if you can find a decent one and stat out with the ThunderTiger 11-4.5 prop. On the first few  flights I think it might be better to have the power on the fast side, like 5 seconds or a bit less lap times, and see how it feels. You have enough experience , from what I have read on here, to get through the early stages to feel it out. I like the banner tow idea also!! If you need plans, they are on outerzone, like Ghostler mentions..
  Type at you later,
  Dan McEntee

[jerry v]

It may also help to have better vertical CG by installing engine upright and stock muffler to add weight. That may require to move the tank up in level with the carburetor.

Jerry

[Colin McRae]

If you use the OS 35s, consider using a 0.276 venturi. Spay bar is 4 mm.

I have a 30s that came with a 0.307 venturi. It was way-way too big and would not pull fuel very well. I switched to the smaller 0.276 and the engine ran much better.

[Dave Moritz]

Collin: I'll certainly mic out the 35 for correct venturi and NVA combination.

Jerry: I'd planned for a vertical engine mount as you suggested as I like the old-time look.

Dan: Your advice concerning power on the maiden flight will come in handy. After scouring the swap meets for an OS 40 this coming month, I'll figure out the power plant. I've decided not to rule out my 46LA as it's not difficult to remove from the Twister. I'm hoping the spacing on the aluminum "T" motor mounts is the same for both the 46 and the 40.

Thanks a bunch y'all!

Dave...

[jerry v]

Dave,
OS.35S will easy fly 36-38 oz model. The footprint of OS.40 FP and .46 LA is the same. You may consider swapping the whole RC engine mount with different engines on. With short tail model may be nose heavy with.46 LA, and landing gear may be too short for 12 inch diameter prop. What is more important - fly the model, and make your friend in hospice care happy!

Jerry

[Dave Moritz]

Jerry:You’re on to something with being able to change engines. All three of the mills discussed (46, 40 and 35) have the same mounting hole spacing.

Collin: Thanks for the heads up on the venturi question. After searching here, I found some additional good advice from Randy Smith about choosing effective venturi size while taking muffler outlet size into consideration.

Yes, I’d love to show my friend a video clip of his plane in action. Hoping that he stays well enough for warmer weather to arrive ‘round these parts..

Much obliged!

Dave Mo…

[Allen Eshleman]

I think that the LA 46 is a bit light than the LA 40.  I'm  thinking of swapping in a 46 for a 40 on a porker of a Banshee.