Yogi

[rchawks]

Does anyone remember this aircraft?

[50+AirYears]

Are you talking about the old Jerry Stollof Vintage FF design, the high pylon pusher? I think somewhere in my collection, I have an old MAN with the article, or maybe I just have a copu of the article. On of our club members was working on an electric powered version. I think there were a number of versions published.

[IWC]

I have seen plans for a Yogi. Check MAN Or Flying Models Mag.

[rchawks]

Sorry so long to answer yes thats the one. Electri pusher it was a ff in the fortys. I was thinking of building one but so little time. It would take scratch building to get there. I was hoping somone knew of the kit, but slim chance of that.

[Blazer]

Klarich Kits http://www.klarichkits.com/ Has a short kit. Jim

[dvint]

There is a Yogi hanging in the AMA museum in Muncie.

[50+AirYears]

Somwhere in my attic, I have a copy of the original late 40s MAN with it . I think I remember that the article had something like an even 1/4 or 1/5 size plan with full size templates for formers and ribs. Also, all the dimensions were printed on the plan, so you could build from the magazine article.

[Demon-Leather]

In My model room, I have an actual 40's Yogi kit.... It was incomplete, but if I remember right (and I don't, sometimes. gettin' old :( ) There was enough of the printwood to replicate the complete kit ( I NEVER use the "actual wood" it leaves VERY much to be desired today) I think Midwest put it out... If I feel like fighting my way through the door, I'll see if I can look it up, & post a photo or two... ;) If You like, we can swap copies of plans.if you have something I don't have.
I believe either RCM, or MAN have plans for an "Electric Yogi" which I have as well :D ) when ya model fer 40+ years,.. You pick up LOTS of stuff! :rolleyes: Bob

[IWC]

Blazer,

I thought the Yogi was a pusher.

[50+AirYears]

I though Yogi was a catcher. Ooops, wrong sport. The plane was a pusher, with a very deep pylon and almost no nose.

[Demon-Leather]

It was NOT put out by Midwest, but rather Eagle Model aircraft Co. on Brooklyn, NY Jerry Stoloff was the designer, it was for class "A" & "B" ignition Competition.( and YES!. it IS a PUSHER!.an ignition-engined pusher, IWC)
Wingspan was 42" Took 1st place at Poughkeepsie, NY on June 11th, and 1st at Hicksville, NY on June 18th..... I'm assuming this was in the mid-late 40's, as I can't find a copyright date on the plan.
She was hid fairly well, by the Bay "Ridge pacer", and 1947 "K.C. Terror", and blocked-in By Bill Winter's "Skybo"..... thank goodness I didn't have to dig too far! :rolleyes:
The parts are all on the plan, but I prefer to photocopy the actual printwood, and transfer it directly to new, graded wood... No muss, no fuss.
If you don't know how, here's a link. it's REALLY easy, no cutting or gluing paper to wood, pattern-prickers, etc,etc,.
http://www.rcgroups.com/forums/showthread.php?t=77687
That way, I get tou build it, & still keep her safe forever :D and, can share & keep them flyin!
I can't do Free-flight anymore, knees just won't take it, but, as R/C assist, I can get them to land at my feet, (well within a reasonable walking distance :rolleyes: )
I added a close-up of the Yogi, right off the plans. Nice thing about Eagle Model plans, they're a work of art! (those were the days, NO CAD, NO lasers, No C/A, just "ole-yeller" Ambroid.... Hey,.. WHAT am I Saying!??) :eek: :D

[Demon-Leather]

Like I said I have the RCM, or MAN plan that was done in the 80's ( I believe) I THINK it was bigger in span, becaus it was done in Electric's infancy.
I'm not sure, but I think it was powered by an Astro 05 "Cobalt" (anyone remember those?) and had heavy batteries, and non-micro gear. Today, with brushless(or even a cheap geared 400) and lipolys,...... it would be a "super-floater"
Aerodynamic as the old-bird is, I bet she'd thermal like an expensive soarplane!
It will take a bit longer to drum-up the plans, as I have about a half-ton (literally!) of vintage paper to sift through. if anyone is interested in seeing it.

[rchawks]

Except for the magazine aritical from the 80's this is all I have. Thank you for posting the pictures! And yes i would like to see the plans if you have a chance. You know everyone is sold on the models being produced now, but I was thinking along the same lines as you about how this would be the perfect plane for electric AP work. Maybe I should set the alarm early on the weekends and jump in with both feet,LOL.

[Demon-Leather]

I sent you an e-mail before I read the post. I'll see if I can find the Electric Yogi plans & post some photos.......... :D Bob

[Demon-Leather]

About broke My neck though.... :mad: Need to talk to my wife about cleaning that room up! (yeah,.. am I dreamning AND "flirting with disaster" :rolleyes: :D )
Anyway, here are some shots of the Electric Yogi. I was scaled up to 120% and sports around a 50" span. If You look at how wide the cord is, You ave a LOT of wing-area there. I don't think there's any need for a 05 Today for her a good geared 400 or brushless should do the job nicely with micro, or even mini-servos and Li-polys.

[rchawks]

That's the version I was looking for!

[Mars Rover]

Maybe I'll finish it someday. Only $3.95 back in the '40s. What a deal. So cute it'll make you puke. If anyone has ideas how to add twin working rudders and linkage to the twin tales - add elevator - keep rudders and elevator from interfering - without changing the original design too much - please help. I'm thinking about just building a sheet balsa tail assembly but would rather use some of the original parts. Fuse is built. Thanks.

Hope the picture works - never posted before!

[rchawks]

AH thank you for sending this one in, man what a picture. I tell you who can give you very good advice about this one is Deamon Leather. He can tell you anything you want to know about making these changes. Try e- mailing him, just click on his name and his e-mail will appear.

[Demon-Leather]

Hey Asshook, if you look closely at the Electric Yogi plans, You'll see it has twin working rudder control. I'll post another photo here, but to to KB size-restraint it may not be too clear. If you'd like, You can e-mail me at Geniside2@aol.com and I can send you a BIG one of that part of the plan so you can see exactly how they do it. The one posted here is 74kb and the other one is almost 1/2MB(474kb) so if your picture editor has a zoom-in you can make any part of it VERY large with no distortion. VERY Nice Yogi!!, I might add! If you go back over this post you will find some links that show how to replicate the origional wood. Remember, once she's built, she's built.
Like I said I'm posting this one, and I have another very large close-up of both elevator and rudder constructions & linkages just waiting for you if you want it. ;) Bob

[Mars Rover]

Thanks. These pics are fine. I get the idea. I thought of cutting the rudders like this but did not think of splitting the elevator near the tips so the non-working parts near the rudders will keep the original stab outline and won't interfere with rudder throw. Having a bunch of exposed rudder linkage above the stab will be a bit funky but I can deal with it.

Since the previous owner built the fuse and cut some of the outlines, I'm not really worried about cutting up the original wood. Kit seems to have all of the stick wood as it's in what looks like the original paper-taped bundle. Print wood seems complete also. What's missing is the the extra stuff listed on the front of the box - Pusher prop, wheel and sheet acetate. I don't remember how I aquired this kit but I know I didn't pay for it. Thanks again.

[50+AirYears]

I found a bit of the original article. Oct 46 Model Airplane News, 4 pages, one page with dimensioned plans so you could do the layout yourself without having to buy the plans, 3 pages of full size templates. Just trace the patterns onto the wood. Even had a wiring diagram for the ignition system for the engine.

[Chris Jenkins]

What a little cutie :)

[Demon-Leather]

If You will look CLOSELY at that photo of the linkage... It's hidden INSIDE the stabilizer, and has nice, neet little "Z" bend exits out each end... NONE of the linkage is exposed...and the actuator arm goes neatly out the bottom for hook-up with the pushrod in & servo in the fuselage... If you want the LARGER version of the photo for detail,.. e-mail me & let me know.. will be MORE than happy to send it along to you! :D Bob

[Mars Rover]

Bob,
Thanks for the offer to help. I think the larger picture would help. I thought of internal linkage for the rudders but the original plans may not be well suited. The stab is built from butt-jointed stick wood, then sanded to airfoil. If your picture shows the ribs, I would probably just build a whole new tail assembly. Also, the forum moderator wants me change my user name (Tailhook was taken) but having problems. I think I can still post but they may have blocked my pictures on later posts - Let me try one.

Here's some of my other O/T projects. You guys may not have much interest in C/L or boats but I have a special interest in saving kits that other people gave up on-or repairing and re-covering old completed models. the Topflight Peacemaker is now ready to cover. The Regal Raider B Proto-I'm looking for some accessory parts-always liked the Harting kits and the previous owner drilled the speed pan for an engine that I have. The Sterling Century Seamaid mahogany speedboat-mostly built but trying to find the time to finish it. Sterling Wizard R/C bipe-almost ready to cover but trying to work out a way to get more aileron area.

The two planes that I really want to build are the Midwest Esquire (the 50" tail dragger) and the Top Dawg but for as common as they were, I think they go for too much money on eBay. I have a Dawg kit box with very few parts and no plans.

Thanks again

[rchawks]

Two very cool models. When I lived in Corpus Christi Tx there was a boat on the T head in the bay that looked just like this model. It's a classic for sure and a beautiful boat. They (full scale) are coming back in style now and are in great demand.

[JMP_blackfoot]

I had lots of fun flying a Peacemaker like this one, first powered with a Taifun .15 Blizzard diesel, which vibrated a lot (see picture), then a Super-Tigre G20/23. That was 40 years ago... :eek:

[Demon-Leather]

Time DOES fly.. when you're havung fun! :rolleyes: :D

[Chas]

TopDawg plans were available for free a few months ago, as a "helper" to a pylon race event; still are on tap if you pay RCM a moderate consideration!
http://www.rcmmagazine.com/e/env/0001VaeVxxDqzs09lg5A1H4/store/store-plans-alpha.html?link=/store/store-plans-catalog-tem.html&item=plans:PL-180

[Demon-Leather]

Since Ken Willard is one of My top favorite designers. I have the Topflite Kit on hand. :D NICE one for geared 400 that one,.. IF you build it light! I've had several versions. a couple 049 glow, and a P.A.W. 09 R/C diesel, and the last one, about 4 years ago) was powered by a ThunderTiger 07R/C glow. I need to build the geared 400 version... but, so many plans, so little time :( Bob

[Mars Rover]

I have to decide before starting wing construction. Keeping in mind that I'm leaning toward sport flying with a throttled glow engine, as opposed to endurance, should I leave the airfoil flat or go with the undercamber as originally intended? On Demon Leather's electric Yogi plans, It looks like there's a choice, but what about changing and old design just by flattening the bottom? Can this turn a good flyer into a turd? Also keeping in mind that I never enjoyed covering a convex wing bottom and it seems like the bigger the wing, the bigger the pain. The biggest I've done was a Sig Super Sinbad with silkspan and although it came out OK, it wasn't perfect.

Also, in pusher configuration, it seems like a ball bearing engine may be a better choice than a bushed crank. Perhaps less likely that the crank pin will constantly be running against the back plate - or create too much pressure on a plain thrust washer. Of the older throttled engines that I have now, and will run strong and idle OK - Fox 15RC, ST.23rc, Green Head Torp 35rc, Torp 40 with Perry carb, Fox 36xRC. I believe the Supertigre is a BB engine. Engine opinions please. Any good choices here?

[JMP_blackfoot]

I believe the Supertigre is a BB engine. Engine opinions please. Any good choices here?
I have two of the ST G20/23 RC, and both are plain bearing.
If your engine has only a small lengthwise play in the crankshaft, then it should be okay, say 0.5 mm or less.
Inserting a thin steel washer between the crankcase and the prop driver is generally recommended to avoid direct aluminium to aluminium rubbing and possible galling.

[JMP_blackfoot]

Sorry, duplicate posting

[50+AirYears]

If that Yogi is around 400 sq in, the 23 is probably the best engine of the ones you listed. Just follow the suggestion about the thin steel washer. That engine will probably have at least twice the power of any of the recommended engines on the kit box or plans.
Changing to a flat bottom airfoil might have no effect on the flying ability, except for lower drag and a slight improvement in forward speed.
Compared to today's engines, those 40s ignition engines usually turned larger diameter props at slower rpms than we are used to today.

[rchawks]

With plans in hand there is always the option of building two wings, one of each version.

[Chas]

Go for the lower power options - maybe the Fox? This was meant to be a "performance" model, but hey it was when my Dad was buying balsa cement!
The undercambered wing will be much more sensitive to variations in angle of attack - it isn't just a matter of glide performance - and the short moment arm will make elevator control of such a section very tricky. Stick with a flat-bottom wing if you're adding elevator control.

Good luck!
Chas

[Demon-Leather]

The flat-bottomed airfoil will do nicely,.. but if you were planning any S.A.M events the aircraft will be illegal for compitition... Sport-flying is A-Ok and soaring is still gonna happen. However, that being said, I think you are going for gross "over-kill" with any of those engines. The plane was designed to haul a good extra 12-14oz aloft with all that hunk of ignition engine that was severely underpowered to begin with, along with pen-lites, coils, jumpers, condensers switch etc., etc.
With todays mini or micro servos, recievers, nicads or li-polys, all you REALLY need in this plane to fly it with authority, is a 09-10 Glow engine. With ABC technology and the porting of today's glows, a .10 will out-perform an O&R ignition "A" engine EASILY! You can pick up an R/C 09-10 off Ebay cheap-cheap-cheap! Every oz you save, means a better-flying/floating sport model! The AP .09 "Hornet" would be simply PERFECT for a "pusher" with it's "can" muffler & side-port exhaust..AND, It's only 5.4oz! :eek: Just another opinion in the mix... :rolleyes: :D Bob

[Mars Rover]

Thanks for the help everyone. There's some great suggestions here. Another good reason for a small engine - there's not much room for mid-size tank, it may end up being mounted lower than desired, and may require a lot of balsa hacking now that the fuse is built.

[rchawks]

I recieved my plans for the Yogi today from RCM. I ordered two plans the Yogi and the Windfreak in a Carboard Tube. But when opened I discoverd that they had shifted (sliding) back and forth in shipment damaging the ends of both prints. Had I known this would happen under the comments I would have suggested to RCM to use paper of some kind to keep this from occuring. The diff in length of the tube and the plans was about 5 inches. My wife says not to worry she could iron it out. Just in case someone needed to know of a quick fix for this shipping problem.

[Soupbone]

I built Stoloff's Yogi in 1949 and entered it in the Plymouths Internationals at Detroit, with limited success. It was powered by glow Arden 19, plenty of power.
I always liked the design and am now building a new one for electric power, r.c. assisted. I think a geared Speed 400 with a 8x6 should fly it fine.

[rchawks]

Hey Soupbone when you get her built, post some pics., this looks like a great plane and it seems to stir alot of intrest. I would like to build one, but there's several other projects ahead of this one.

[Soupbone]

Are you talking about the old Jerry Stollof Vintage FF design, the high pylon pusher? I think somewhere in my collection, I have an old MAN with the article, or maybe I just have a copu of the article. On of our club members was working on an electric powered version. I think there were a number of versions published.


Did your club member ever complete his Yogi, I'm building one now. I built my first Yogi in 1948 and am adapting to electric, speed 400 geared. I'd be interested in any feedback for your friend.

[50+AirYears]

Couldn't tell you. His wife and kid were severely injured in a car crash (other driver drunk, high, and talking on a cell phone, ran several red lights at almost 80) and in our newer advanced health care system, the bills were coming close to bankrupting him, so he has dropped out and nobody has heard from him in a couple years.

[Applehoney]

>I have two of the ST G20/23 RC, and both are plain bearing.

?? I have had a number of G20/23's in use in contest F/F over the course of many years; they are BB engines, not plain bearing