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Old Oct 15, 2014, 08:45 AM
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United States, NH, Bedford
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Scale Build-Off 4 Plans built 64" Cessna UC-78, T-50 Bobcat

This will be my first entry into a contest, so Im looking forward to being included with such a talented group of builders.

My entry is a Cessna UC-78, also commonly known as the T-50 Bobcat or Bamboo Bomber. I am building from plans drawn by Bob Morse and published in Radio Control Modeler magazine in Aug 1964. The plans were drawn for a 64 wingspan pulled around by a pair of glow engines and directed by 4 channels. I will be converting to electric and adding flaps and retracts.

I started the build about a year ago, but it has languished on the table for many months. Im hoping this contest will help me move it along.

The plan is for a civilian color scheme, but I won't be using the Songbird decor from the 1950's TV show Sky King in which the T-50 was featured.

Tim
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Old Oct 15, 2014, 08:49 AM
Wanted for breaking OHM's law
Dennis Sumner's Avatar
United States, MI, Canton
Joined Sep 2002
1,696 Posts
Welcome aboard Tim. You've picked a great subject, I like the color scheme in the picture, sure won't be confused for an ARF at the field...

Denny
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Old Oct 15, 2014, 09:38 AM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
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No, they'll think it is your Bellanca!

I bet you have some teal Ultracote scraps you can send to Tim.

-Jim
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Old Oct 15, 2014, 09:40 AM
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United States, NH, Bedford
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Thanks, Dennis. I wish I had a good story behind choosing this plane, but its looks just grabbed me when I was searching for twin to build. I'm hoping I do it justice.
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Old Oct 15, 2014, 09:56 AM
Wanted for breaking OHM's law
Dennis Sumner's Avatar
United States, MI, Canton
Joined Sep 2002
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Quote:
Originally Posted by campbelltf View Post
Thanks, Dennis. I wish I had a good story behind choosing this plane, but its looks just grabbed me when I was searching for twin to build. I'm hoping I do it justice.
I like the scheme...and looks like Turquoise Ultracote would be a good match.
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Old Oct 15, 2014, 10:23 AM
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I like the scheme but prefer this color palette better, just not sure I can find them in a plastic covering...

1944 Cessna UC-78 Bobcat (Bamboo Bomber) - Fly/In Cruise/In (4 min 42 sec)


If not, maybe I'll try doculam and paint.
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Old Oct 15, 2014, 12:31 PM
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From the beginning...

As mentioned, I started this build about a year ago, so let's jump in the way-back machine to see where it started.

I originally ordered these plans straight from RCM Plans, but as you may know, they've been focusing on order taking, but have let the order fulfillment end of the business take sabbatical. While I was able to retrieve my funds through my credit card company, I still needed the plans. I ended up buying the Aug 1964 back issue of the magazine on eBay and had the plans enlarged at a local copy shop along with an extra copy to cut out templates.

The plans call for 2 deg of washout in the wings, so I did some math and added building tabs to the rib templates to account for the twist.

Balsa was used for the wing spars, but I opted for spruce and I extended the shear webs the full length of the main and rear spars.

Finally, the plan showed wing tips carved from balsa block, but I decided to laminate them instead.
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Old Oct 15, 2014, 01:09 PM
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O'Fallon, Mo.
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I'm going to be following and watching, Tim. I like your subject here. I have my eye on a 50"-ish T-50 being developed by Park Scale Models for my first twin.
Don
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Old Oct 15, 2014, 01:45 PM
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United States, NH, Bedford
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Hi Don, thanks for coming along. This is my first twin as well, so we'll learn together.

I've seen the thread with Zeke's Bobcat, it looks great. Though I secretly hope he finishes the Boeing 314 Clipper first (I already have a Bobcat ).

Pat Tritle mentioned he was picking his version of the Bobcat back up as well, so there may be a couple of choices on the market in the not too distant future.
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Old Oct 15, 2014, 06:04 PM
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United States, NH, Bedford
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Wing sheeting

Once the bones were in place, I glued up skins for the tops of the wing halves and glued them in place. With both halves up to the same point it was fun to put them together and see how it looked.
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Old Oct 16, 2014, 04:45 AM
Slip the surly bonds...
Sopwith Mike's Avatar
Christchurch,England
Joined Aug 2004
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A great subject. I've been a convert to opposite hand prop rotation for twins - it makes life a little easier on take-off and for those moments when full throttle low down slow is needed to get out of trouble.

Not that you will need the latter option
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Old Oct 16, 2014, 07:34 AM
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Oh, I'll take all the help I can get, Mike. In fact, the plans call for reversing the direction of the right motor.
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Old Oct 16, 2014, 08:30 AM
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Flaps

The plans do show the outline of flaps, but do not provide the how. After some reading and YouTubing I learned the real bird only used flaps for landing and it appears the manner of their descent isn't too complicated. Here's a good shot of a couple of take offs and landings with flaps.

Cessna T50 Bamboo Bomber at Oshkosh 2013 Saturday & Friday (3 min 36 sec)
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Old Oct 16, 2014, 08:37 AM
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Following along...

Lots of options for counter rotating props from APC. Look for EP (Electric Pusher) on their website.

I like your preference for color scheme. It looks like a metallic brown or bronze. Sig AeroKote has a metallic bronze that may be close, but I haven't seen a brown in that shade. It may be time to brush up on your painting skills.

-Jim
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