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Jan 27, 2009, 10:50 PM
TEAM GORGEOUS
SZD16's Avatar
Thread OP
Build Log

Tmrc 40% Tg-2


Like I need another project!
Well, as the title states.....this build log is going to be about the TMRC 40% TG-2.
I believe that this may be the largest scale sailplane kit every offered..... I have been after Tom Martian for what seems like forever to make this kit......and as of today.....I have one!
Alex at AK-Models is doing the cutting of the kits and he does an excellent job. Along with the TG-2 I had him cut the wing ribs for my 1/3rd scale Pratt Reid which he did for a reasonable price and did an outstanding job to boot! If you need any laser work done Alex is the guy to talk to.
The kit consists of all the laser cut plywood and the drawings.....the builder needs to supply the stick wood and the 1/32" ply for the wing sheeting plus any and all hardware needed to finish.
For a plane of this size 250" span, 24" root cord.....I believe that is the way to go. Anybody that is going to take on a build of this magnitude will have their own idea's about what hardware to use and such......Tom has informed me that he will have available a scale tow release for it along with a set of seats and dash panels.
The plan in the mean time is to spread out the drawings in the shop and lay the parts down to check fit and to start a cut list for the strip wood that I will need to cutup......for now, here are some pictures!
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Jan 27, 2009, 11:10 PM
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John Walter's Avatar
Very cool. Without your boot in the first photo, I would have thought it was the 1/10th scale "Little Flyer" version!

Maybe I should think of the Little Flyer as a 1/4th scale version of your plane instead of a 1/10th scale version of the full size plane.
Jan 28, 2009, 12:23 AM
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Lupe's Avatar
I am looking forward to this build.
Jan 28, 2009, 02:55 AM
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Big Nuts 181's Avatar
That is freaken AWSOME!!! great work SZD, your going to love flying 40%, just a shame your not living in Ausstralia or I'd offer you a tug to the same scale.....
Jan 28, 2009, 08:36 AM
Nothing like a good WOODIE!
cooper998's Avatar
BIG plane you have there, any idea of projected weight? Wish I had a shop big enough to build something that big.
Signing on to see this one come to life

cooper998
Jan 28, 2009, 02:36 PM
Registered User
Thanks for posting a build thread!

Quote:
Originally Posted by cooper998
... any idea of projected weight?...

cooper998
Good question . I haven't tackled a guesstimate of the all up weight on this one and am afraid to venture a guess and ruin my record . Do you suppose we should have one of those "guess my weight" contests and give away a prize to the person witht he best estimate?

SZD-16, want to weigh all of the parts and offer that and the dimensional specs for fuse, tails and wings as the only clues?

tm
Jan 28, 2009, 06:19 PM
Registered User
Very nice!

What airfoil is used?
Jan 28, 2009, 08:35 PM
Where's the lift?
dgliderguy's Avatar
Quote:
Originally Posted by mmartin55
Do you suppose we should have one of those "guess my weight" contests and give away a prize to the person with the best estimate?
Ooh! Ooh! Let me go first!

Cubic loading of my TG-2, at fifth-scale (3.3m span), is:
6.5lb/(8.66 sq ft)^1.5 = .254 lb/ cu ft

Cubic loading of a full-scale TG-2 (15.84m span) is:
860 lb/ (214 sq ft)^1.5 = .275 lb/ cu ft

So if we assume that Tom Pack's 6.35m span model (approx 33 sq ft) will be roughly between the two, at, say .265 lb/ cu ft, we get an AUW of about....

FIFTY POUNDS!!

I say Tom is an experienced builder, who will know how to keep weight out of the tail, so as to minimize the lead needed in the nose, and I say he will come in just under 50 lbs. So my guess is:

>>>>48 POUNDS<<<<<<<<<

Hey, Tom! You go, guy! I can hear the chainsaws cutting down those balsa trees now!


Don.
Jan 28, 2009, 09:04 PM
Registered User
DT56, It uses the full size airfoil. Here is the data that Don likely referenced to get his figures. Its only fair since its public that I post. I wont be venturing a guess to skew the contest results however.

SGS 2-8 (TG-2 / LNS-1) Specifications

Span 15.84 m./ 52 ft
Area 19.88 sq. m. / 214 sq.ft.
Aspect ratio 12.6
Airfoil NACA 4412
Empty weight 204 kg. / 450 lb.
Payload 186 kg. / 410 lb.
Gross weight 390 kg. / 860 lb.
Wing loading 19.62 kg. / sq. m. / 4.02 lb. / sq. ft.
Structure metal/ fabric, 1-spar, 1-strut-braced wings; metal/ fabric tail; steel-tube/ fabric fuselage.
Performance

L/D max. 23 68 kph / 36 kt / 42 mph
Min. sink 0.84 m/s / 2.75 fps / 1.63 kt
64 kph / 35 kt / 40 mph
Other

Country of origin USA
Designer Ernest and Paul Schweizer
No. of seats 2
No. built 57
No. in the U.S. approx. 19

Specs by permission of the Sailplane Society of America (SSA) as published in The Sailplane Directory.

tm
Last edited by mmartin55; Jul 07, 2009 at 12:25 PM. Reason: wrong specs table
Jan 28, 2009, 09:26 PM
Registered User
Here are detailed specs of the TG-2 model at 40%:

Length Overall: 121.2"(3.08m)
Fuselage cross section largest bulkhead: 18" x 10" (457 x 254cm)
Wingspan: 249.6" (6.34m)
Airfoil: NACA 4412
Wing chord: 24" (609cm)
Wing thickness 3" (76mm)
Length each wing: 119.79 (3.04m)
No. Ribs each wing: 44 (includes D section ribs at 1/2 spacing)
No. Aileron ribs each wing: 19
Height Overall: 35.56" (903cm)
Vertical tail span: 24.69" (627cm)
Horizontal tail span: 46.46" (1.2m)

Note: ribs (as well as all of the rest of the structure) were drawn from full size Schweizer blueprints and documentation and photos.

tm
Last edited by mmartin55; Jan 28, 2009 at 11:27 PM.
Jan 28, 2009, 10:05 PM
Registered User
Thanks TM!

Very impressive model!!!
Jan 28, 2009, 10:12 PM
Registered User
Seadog's Avatar

Something wrong here..


If the original was indeed 10.97 m, then the model at 6.34 is more than 40%. Maybe the 10.97 is the length? My guess is that the full-size specs are off. Anybody? Anybody? Bueller?

Dave Smith
Jan 28, 2009, 10:34 PM
Registered User
Good catch David. My mouse grabbed the wrong text when I copied!

There, that's better,

tm
Jan 28, 2009, 11:12 PM
TEAM GORGEOUS
SZD16's Avatar
Thread OP
Quote:
Originally Posted by dgliderguy
Ooh! Ooh! Let me go first!

Cubic loading of my TG-2, at fifth-scale (3.3m span), is:
6.5lb/(8.66 sq ft)^1.5 = .254 lb/ cu ft

Cubic loading of a full-scale TG-2 (15.84m span) is:
860 lb/ (214 sq ft)^1.5 = .275 lb/ cu ft

So if we assume that Tom Pack's 6.35m span model (approx 33 sq ft) will be roughly between the two, at, say .265 lb/ cu ft, we get an AUW of about....

FIFTY POUNDS!!

I say Tom is an experienced builder, who will know how to keep weight out of the tail, so as to minimize the lead needed in the nose, and I say he will come in just under 50 lbs. So my guess is:

>>>>48 POUNDS<<<<<<<<<

Hey, Tom! You go, guy! I can hear the chainsaws cutting down those balsa trees now!


Don.
Thanks Don! I was going to dig out that formula and run the numbers.....but now I don't need to!
You're real close.....if not spot on. I'll be happy with it in that range of 45 - 50 lbs. anything less and it won't fly worth a dang and anything more and you start to approach the AMA 55# rule and I don't want to hassle with that. So the plan is 47 -48 lbs.
I'll get some weights on all the parts that came in the kit this weekend....I plan to start putting the fuse together this weekend so I should have some pictures up in awhile.
Jan 29, 2009, 04:07 AM
Registered User
Big Nuts 181's Avatar
nice work guys now this is what the forums are all about!


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