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Don Smith Cessna T-50

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Don Smith Cessna T-50

Old 11-28-2010, 10:25 PM
  #51  
Murphey
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Default RE: Don Smith Cessna T-50



Joel: I'm using a pull/pull rudder. The tail wheel post and rudder are connected in the tail cone. The yoke is much easier to make than it looks...probably easier than bending one from music wire.

Doing the wing cube loading, the 25# has a cube loading of 10.39, making it more like a sport flier...the 35# has a cube loading of 14.54 making it like a warbird...I like sport better! It will most likely come out more than 25 and hopefully less than 35!
M

Wing Span 100.6
Wing Area 1642
Min Weight 400
Wing Loading 35.08
Cube Loading 10.39
Max Weight 560
Wing Loading 49.11
Cube Loading 14.54
Average Wl 42.10
Average Wcl 12.47
Old 11-29-2010, 09:41 AM
  #52  
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Default RE: Don Smith Cessna T-50

Murphey,

Even with a CWL of 10.4 that's pushing into "scale" IMO. And forget 14.5. I have DF fiberglass jets with lower CWL . I'm definitley going to work hard at keeping the weight down.

I like to see some pics of your P-P setup for your rudder. I was thinking of seperate steering servo for a little better ground handling and trying to keep it all internal, but then could go single servo (rudder) method.

Thanks,
Joel
Old 11-29-2010, 12:21 PM
  #53  
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Default RE: Don Smith Cessna T-50

Murphey,
I went back and crunched the numbers some more and it looks like a full scale T-50 has a CWL of around 13.35. (if you guesstimate flying weight @ 4250lbs (dry weight +750lbs, pilot and 3/4 tank of gas)). for this 1/5 scale model that would put us at 514oz or 33.2 lbs. Sooo maybe a 28-30 lbs target might be more realistic ??? Maybe I'm panicing a little early. It's just seems like a lot of weight for a plane this size.

Joel
Old 11-30-2010, 01:16 PM
  #54  
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Default RE: Don Smith Cessna T-50

I expect mine to weight between 35-38 and it will be fine. I have flown 101" B-25s at 35 pounds, 101" T-6 at 32 pounds, 85" Mustang at 32 pounds, so I have no doubt that this plane would be a cake walk at 40 pounds.
Old 11-30-2010, 03:03 PM
  #55  
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Default RE: Don Smith Cessna T-50

Jeff,

What are you using for power ? I have 2 satio 125a's. Do you think that's going to do the trick ?

Thanks

Joel
Old 11-30-2010, 05:05 PM
  #56  
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Default RE: Don Smith Cessna T-50



Joel: I guess at this point I can't worry about the finished weight...only try to build reasonably light. I've tried to upload a few pics but unsuccessfully, perhaps due to the issues RCU experienced yesterday. I'll try that again later.

What size prop does the 125 swing? As near as I can tell, an 18" prop is 20% of the full scale. I'm using 18X6 on the G-26.
M
Old 11-30-2010, 09:12 PM
  #57  
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Default RE: Don Smith Cessna T-50

A 16x6 would be about the limit. It might swing a 18x4 but not with the authority of the 16. according to a couple of the thrust calcs I found, at 8500 rpm I should get approx 12.5 static thrust x2 is 25lb which should be fine. It's not going to horse it up but should be enough ??

Joel
Old 12-01-2010, 07:11 AM
  #58  
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Default RE: Don Smith Cessna T-50

We run 16x8s on the G-23s that we have. 15x8 three blades on the B-25s. The normal RPM for a 16x8 on a g-23 should be high 8's depending on weather, tune, etc.
Old 12-01-2010, 05:36 PM
  #59  
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Default RE: Don Smith Cessna T-50

Joel: Here is another attempt to download some pictures...
Looks like that worked this time.
M
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Old 12-01-2010, 05:40 PM
  #60  
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Default RE: Don Smith Cessna T-50

Hmmmm Not sure what went wrong with that 3rd one but, and pardon the pun,...You get the Picture!
M
Old 12-01-2010, 08:34 PM
  #61  
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Default RE: Don Smith Cessna T-50

Thanks for getting those up. Nice job on the interior. Did you work with one of cockpit kits or start froum scratch ??

Joel
Old 12-01-2010, 09:14 PM
  #62  
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Default RE: Don Smith Cessna T-50



The interior kit is from Dynamic Balsa but I didn't use the seats...cut mine from foam using the profile on the drawings. Here is a picture of the right nacelle
M
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Old 12-02-2010, 05:38 AM
  #63  
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Default RE: Don Smith Cessna T-50

Great... Where did you find the large rounded spinner ? They look pretty close to scale

Joel
Old 12-02-2010, 06:06 AM
  #64  
Murphey
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Default RE: Don Smith Cessna T-50



They're from Tru-Turn. Hub style TT-2732-B-120 2-3/4" AT-6 120-SLOT Aluminum Spinner
Should have the landing gear back from Down and Locked next week! (converted from from air to electric) Then I can begin fitting everything in the nacelle
M
Old 12-02-2010, 07:16 AM
  #65  
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Default RE: Don Smith Cessna T-50

Thanks....
hI'm also leaning toward converting the retracts to elec. Just not sure whether to do it myself or not. I contacted lado about actuators but 4 would cost $400+ shipping from france. I wrote "Down and Locked" the other day to get an estimate on a 7.4v refit but haven't heard back yet. What are they charging you for the conversion ??

Joel
Old 12-02-2010, 07:35 AM
  #66  
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Default RE: Don Smith Cessna T-50

Mitch Stott at D&L is great to work with! And he's in NC...not France. There are options available like seperate battery ore receiver battery, timed up and down etc...worth a try. Tell him the guy in Denver sent you! The conversion was $250 plus shipping.
M
Old 12-02-2010, 07:52 AM
  #67  
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Default RE: Don Smith Cessna T-50

Murphey,
That sounds very resonable, and NC is a lot closer than France in more ways than one . Let me know when you get yours how they turned out. As I mentioned earlier the pair I have are a salvage from a crash. I ordered a couple of parts I needed to repair them and they are due in any day.

I'm dying to get started on this thing. just have a couple of loose ends still on the bench and a couple of honey-do items. Hope to start by Christmas/New Year.

As you know documentation is weak. If you found any "gotchas" a long the way or found a particular order that needs to be followed, any suggestion are welcome.

thanks for your help

Keep us posted on your progress

Joel
Old 12-02-2010, 03:08 PM
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Default RE: Don Smith Cessna T-50

Helo Murphey, sorry for the very late response, got caught up in the holiday routine................beautiful work on the tail wheel, I really like the plastic hub covers........been thinking of changing to fiber, alum or plastic to cut weight.......the extra parts shown are for the drag brake and mooring eye that protrudes thru the canvas dust cover, this boot was made from a pair of old worn out tan Khakis shorts.......I cut the fabric to include the original hem so it will show the stitching at the bottom,a nice original look.........

Rich.
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Old 12-02-2010, 03:38 PM
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Default RE: Don Smith Cessna T-50

Murphey, I just sent two pic's.......but they came over way to large......sorry about that.

Rich.
Old 12-02-2010, 04:58 PM
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Default RE: Don Smith Cessna T-50

Joel,

take a look at post #44..........you will see four photos of Jon Larsons Songbirdcolor scheme..........Jon is also the president of a club dedicated to finding, restoring and flying real Bobcats..........the club is called "The Flying Bobcats".......google it......you will find a wealth of info on this site........Jon is also an expert on Sky King.....and, as you see in the last photo even enjoys dressing up the part........he is also an avid collector of Sky King memoribilia........there should be contact info on the site..............as it turns out, I will be using this aircraft for documentation for my own project..........except, I will be using the original AAF UC-78 that it was when Jon purchased it years ago.......This Cessna was a US Army UC-78B....no. AF-42-71814.......it wasdelivered to Minter Fieldnear Shafter at Lerdo Bakersfield California where is served to the end of the war........it waseventually sold for $400 and changed hands many times and was moved to los Angeles and Hollywood Ca........then to Challenger Airlines in Salt Lake City UT.......then to Airflight, Inc. in Seattle Wa...........then to General Aircraft Sales in Auburn Wa..........thenon 3-3-62, it was finally sold to J D. Larson, Auburn Wa...........then on 3-29-64 it went to Jon D.Larson Jr.............on 4-11-82 it went to Rick G.Larson, Kent Wa............and finally on 1-15-95 it was passed on toJon D. Larson Sr Auburn where it resides today.......Jon is theowner to this day and is currently registered as N53378....quite a colorful history......

Rich.

Old 12-02-2010, 06:09 PM
  #71  
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Default RE: Don Smith Cessna T-50

Hello all,
I have just come upon this thread. I live in Wichita, KS and know of 2 of these Bamboo Bombers in the area, and would be willing to take some pictures of them to help with documentation. PM me and I will see if I can help.
Old 12-02-2010, 07:24 PM
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Default RE: Don Smith Cessna T-50

Hi, are these aircraft both in flying condition?

Rich.
Old 12-02-2010, 11:51 PM
  #73  
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The last time I was there, yes they were. they are located at an airport called "Dead Cow International". They were hangared, and in excellent condition.
Old 12-03-2010, 07:30 AM
  #74  
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Default RE: Don Smith Cessna T-50

I am doing mine in the colors of the Wright Stuff Squadron out of Dayton Ohio. Had to go military so I could fly it at warbird flyins.
Old 12-03-2010, 10:44 AM
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Default RE: Don Smith Cessna T-50

Thanks for the info.....

Rich.

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