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Post  rdw777 Mon Aug 16, 2021 7:33 am

After enjoying the CEF for a few months and contemplating what to build first I decided on Goldberg’s Stuntman 23…. The last few years have been electric R/C planes and helis with a little free flight mixed in….It’s been over 40 yrs since I taught myself to fly CL but after seeing and learning a lot here the urge is tugging at me again …. Pun intended Very Happy

So I downloaded the patterns from Outerzone and started cutting out parts…. I learned this design is weak behind the wing joint so instead of using 1/4” for the fuse I laminated two pieces of 1/8” together with some channels for two pieces of bamboo from an old window shade…. Nature’s carbon fiber….They are about 1/16 x 1/4….Stuntman 23 3f799e10
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Post  rdw777 Mon Aug 16, 2021 7:36 am

Mocked up….Stuntman 23 77408f10
Stuntman 23 Bf5a0f10
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Post  rdw777 Mon Aug 16, 2021 7:41 am

Engine will be a horseshoe with fine needle and a # 3 cylinder…. Think this tank will work in the position shown? It’s what I have at the moment…. I know it’s not a stunt tank but I plan on keeping things positive side up, at least for awhile….,Stuntman 23 D6ef5d10
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Post  rdw777 Mon Aug 16, 2021 7:48 am

I also sketched and printed a 3” bell crank in a lab at the school I work at…. I had a tee shaped bushing for center bearing…. Still need to drill the lead out and push rod holes…I’ll be bugging some of you for best placement, balancing, trimming and etc…. All for now til I get some more shop time….Best….

Robert

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Post  getback Mon Aug 16, 2021 8:55 am

Hey Robert the Stuntman 23 is looking good and you did good by sandwiching the bamboo in the fuse right behind the wing TE is were they usually break , I have one broken there and another not yet!?! LOL The postage stamp engine should do a good job to get you back in the air . I put a .049 Medallion on my oldest one and it jumped off the ground so fast gave me a startle Very Happy That tank looks big ? !/2 Oz will get you dizzy .
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Post  duaneh Mon Aug 16, 2021 9:14 am

I like your engine choice, Robert!
Stuntman 23 100_2413

Agree with Getback that the tank looks a little large. Mine is 1/2 oz. and I wouldn't want it any bigger. I would mount the tank in line with the engine. The clearance notch in the wing doesn't hurt anything.
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Post  944_Jim Mon Aug 16, 2021 5:19 pm

Looking good! I performed my first loops and inverted flights with my SM23 over 30 years ago!

Short tank the first few runs. You'll need to fill enough to cover the fuel pickup tube while static on the launching pad (about 40% full). The remaining fuel will sling out to the pickup as designed once the plane is flying.

Please take videos...we.like videos!
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Post  NEW222 Mon Aug 16, 2021 7:01 pm

Coming along very nicely. I like the look of the 'naked wood'. Keep up the good work.
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Post  rdw777 Mon Aug 16, 2021 8:49 pm

Thanks for the support guys, Much appreciated Very Happy ….. I’m excited to build a CL plane after a long time! Here’s a different photo of the tank with the engine…. The photo with it on the wing makes it look big…. I’ll measure it when I get home on the weekend and find its capacity ….

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getback, I bet your SM 23 hauls the mail with a Medallion on it!! How long are the lines?…
I have some 10 lb Spyder Wire fishing line…. Is that strong enough?

duane, Your SM 23 was part of the inspiration for me to pull the trigger and build one similarly, Well executed! Thanks for posting it here….

Jim, Are you saying the tank shown here could work for right side up kind of flying? Be great if it could….. If not I’ll come up with something more appropriate

New, I like the raw wood as well…. I plan on tissue trim for color and part of the wood left showing but clear coated with oil base polyurethane or spar varnish with the focus on keeping things lite…

Robert
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Post  944_Jim Mon Aug 16, 2021 11:00 pm

Yes, wedges work fine right side up...and upside down. You do need to have enough fuel to cover the pickup tube while stopped. It will sling to the outside while flying. Insert cheesy picture here:
Stuntman 23 Img_2053
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Post  944_Jim Mon Aug 16, 2021 11:12 pm

Oops! I just realized I made a mistake regarding who has what plane/tank. Shocked
Sorry for the confusion.

Yes, a box tank will work for Roundie-Roundie, even short-tanked. I agree with the others...big tank for the job. Hang onto it for your next size up trainer. A 3/8 tank should get a couple of minutes of flying.

I like 1/2 ounce for 2:30-2:45 minutes. Or set the current tank on the indicated CG and let it into the wing so 1/2 is above the crankshaft center line, and 1/2 below the crankshaft centerline...if you ever want to fill the whole tank. Otherwise raise the tank so the desired (and repeatable) fuel level is split above/below crank centerline at the start of the flight. You will be cutting into the wing a good bit if you let it in.

Otherwise hang it on top of the wing, but never fill it. It will want to gravity feed and make you pull your hair playing with the needle. I ran into that with a twin I no longer have, and fixed it by effectively lowering the tank.

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Post  getback Tue Aug 17, 2021 6:38 am

Robert it a 1/2 Oz tank Too Big https://brodak.com/fuel/fuel-tank/rect-fuel-tank.html I tried to fly the Medallion one on 30 ' spectrum line .008 i am pretty sure 8# .. 10# would bee good enough , If it were me i would add a couple thin washers behind the engine's LF. side for some offset .. If you have to buy a tank i would recommend this one > https://brodak.com/fuel/fuel-tank/wedge-fuel-tank-3-8-oz.html or at least the same size This Site Rocks!
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Post  rdw777 Tue Aug 17, 2021 8:03 am

Perfect information, Thanks gentlemen…..Will come up with a 3/8 wedge….

Jim, I like the cheezy sketches….. Will come up with some of my own before this is over Very Happy …. Best…

Robert
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Post  FlipStart Tue Aug 17, 2021 7:07 pm

Now I'm really getting fired up to build a plane after seeing how nicely your Stuntman 23 is coming along I cant wait to see it fly.
I might go that rout myself, just download plans. I have boxes of balsa and other wood.
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Post  rdw777 Tue Aug 17, 2021 8:07 pm

Hey FlipStart, I’m glad you like and hope you decide to build one… I’m anxious to get it the air as well!!…… SM 23 plans are nice because full size patterns are ready to go…. Except for the front half of the stabilizer for some reason but it’s not hard to figure out…I made pin holes thru the plan into poster board then used those patterns to guide the knife directly on the balsa…. Quick and easy….

Robert

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Post  FlipStart Tue Aug 17, 2021 10:42 pm

Nice!... I'm going to clear off my hobby bench tomorrow, It's not bad really. I'll see how much of the Lil Snip I can find, It may all still in the original box actually. I hope the plans are in thee. If it doesn't look too good then I'll go the download route.
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Post  706jim Wed Aug 18, 2021 12:46 am

Interesting that the plans list a number of 0.099 engines for power.
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Post  cstatman Wed Aug 18, 2021 11:05 am

these lads re-kit some of the golden era .049 CL planes

https://vintageperformancemodelairplanes.com/collections/1-2a-radial-mount-kits

just fyi. they also have a stunt man kit

Yes, yes, I know, I know -- its so expensive. so is? everything
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Post  getback Thu Aug 19, 2021 6:50 am

They got some of the old timer kits a better prices than FeeBay , I haven't order anything from them myself but see some i would like too Huh...
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Post  rdw777 Sun Aug 22, 2021 9:43 am

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Rather that order a 3/8 oz I decided to try and fab one up from brass shim stock…. I figured dimensions and printed a form to mold the center part around and help make the end caps…..Left the vent tubes a little long to go thru the cheek block….. Weighs 6.5 grams….Passed leak test OK….Don’t look at the soldering to hard…. Looks like a buzzard flew over it Very Happy
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Post  FlipStart Sun Aug 22, 2021 5:39 pm

That's GREAT!... I might just copy your idea. I need the same tank for my Lil Snip build. Turns out I didn't have one in the storage unit. I like it! your soldering looks good to me. Important thing is it looks shiny so you god good flow and no cold solder joints. Better more solder than not enough. Did you pre tin the edges first or just go for it?

I built a cylindrical tank about 30 some years ago the same way but it was for a little Quickie 200 R/C plane I had. Had a TD .051 on it with crank case pressure to the tank. I put a clunk in it of course for the various positions the plane would be in. It was in some pretty wild positions too. It was a fun one. It would ROG to the middle of the runway and weathervane into the wind and take off as the engine would hit it's stride about the same time. No throttle, it was balls to the wall till it ran out of gas.
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Post  rdw777 Sun Aug 22, 2021 7:07 pm

Hi FlipStart…. I used 60/40 rosin core solder….I did not pre tin but wiped on a very thin layer of plumbing paste on the joints….. The kind used for soldering copper pipes….. So a good alcohol rinse was to follow…. I think the brass was .005”….. Maybe you can build a custom tank for that Lil Snip Very Happy
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Post  944_Jim Sun Aug 22, 2021 8:17 pm

Dude,
I feel like I was just hustled! You bring a slightly upgraded, scratch built SM23 as your return to CL 40 years later...and then scratch out the appropriate tank too?

I'm glad I didn't have any money in the bet.

PS That tank is sweet!
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Post  getback Mon Aug 23, 2021 6:05 am

Cool , Looks good to me , did you check the volume while you were testing for leaks ? I take it you have a 3D printer , there has been a couple people here that have made tanks before with good out comes . No wedges that i recall , Jason does a good job at printing backplates / gears steering pivots and other hard or impossible to get item's Very Happy https://www.coxengineforum.com/t12638-pee-wee-horseshoe-back-plate?highlight=020+back+plates Very Happy
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Post  rdw777 Mon Aug 23, 2021 7:31 am

Jim, Your better bet will be on my first loops LOL Very Happy ….I haven’t done CL in those 40 yrs but a lot of RC and a good bit of FF mostly built from prints…. Hopefully I’ve learned a few things…. Seriously, Thanks for the advice on the tank….. I probably would have went with the square one and may have been disappointed with the outcome…. Thanks!

Getback, I did the math before I drew it up and printed…. Google says it’s volume/1.805 to get oz….. Plus able to confirm somewhat from the Brodak site….. My syringe is not marked so can’t check in that way….You were right about the square tank being 1/2 oz…. Photo for comparison….. The tanks are the same length…,

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I have access to a lab with printers and drawing tools at the college  I work at…Best material is ABS.,,, I don’t think it’s that fuel resistant but I may experiment some more…Thanks for your advice with the tank as well…..Best

Robert
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