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Wrench66's 2nd entry contest #2 "38 Special"

Old 10-08-2008, 04:52 PM
  #1  
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Default Wrench66's 2nd entry contest #2 "38 Special"

OK, #2 build is of course another beautiful warbird.....but with a special twist ..............this model never existed. Huh? you say, that's right....a concept plane that seems reasonable enough yet did not see production.
It will be a P-38 style plane with twin boom stabilizers and big single elevator, but the dividing point is that mine will have a single engine. There are a few plans around that involve a similar type but mine differ enough to warrant a new name......38 Special

-----Ray
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Old 10-09-2008, 05:28 AM
  #2  
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Hi Ace,
Well...now that you mention it......OF COURSE!! lol
Gonna be a real speedy one, using a 1500KV red motor on 3s and target weight of no more than 14oz. using a flat plate wing (been having A LOT of fun with these lately...lemme tell ya. Simple and fly just great, no bad habits except for a touch faster landing.....so easy).
No plans for rudder at the moment, but the plans may change if I deem it nesassary......just ailerons and elevator for flight controls. This one will not be 3D-able as the control surfaces will be more in preportion to the plane's size (no huge ailerons on this one).
Wing span: 36'
Total length: 28'
Target weight: 14oz max w/1500 3s
Power: 2812 Emaxx "red motor" spinning 8x4e APC
should be capable of near 20oz thrust at just over 11a for just over 125w. We shall see!

Started on the wing tonight, goin pretty quickly.
Hope to be flying by weeks' end.

---Ray
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Old 10-09-2008, 06:38 AM
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thanks again, Jim......I'll head over there directly

all the best,
--Ray
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Old 10-09-2008, 07:51 AM
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Originally Posted by CHELLIE View Post
I Agree with you Steve Gee, I think the RENEGADES created a RC Monster Here, you cant stop him But who wants to Looking great Ray, Keep up the Nice work, Chellie
HEY Steve.......Now ya got me thinking.....can you 3D a rudder-less plane?? EVEN if I did make the rudders live, they are DINKY even compared to the Spit's vert stab.....maybe with 90+ degree throw?? hehehe, now yer talkin!! Knife edging a P-38 would HAFTA be a first of some sort?! Only you dude.

Hi Chellie---------hehe, yeah when I have the time (like recently) I get such a rush outta cuttin foam and figurin' power and weight calc's.....you, as much as anyone Chellie, are responsible for this desparate need to see a sheet of foam material reduced from it's former full-size glory, to a few key pieces of Tetris-like shapes that are supposed to fly! Yeah sure, whateva' hehehe lol
Enough talk now......my Exacto is cooling off

Ray

OK, aileron's are cut and smoothed, working at the tail now.......
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Old 10-09-2008, 08:24 AM
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Originally Posted by ministeve2003 View Post
I'm sure we could figure out some interesting manuvers without the rudder, but from the looks of those ones, you'd have pleny....

Ps, you can make 1 servo move both rudders, just put a little cf rod to join them, and they will both work... the same way the rthyem biplane joins the second set of ailerons...

SK
Oh, I thought about it......same line of thinking as I was imagining the shrinktube type link BUT I went ahead and left the rudders completely locked.....they aren't even cut. IF it seems I need them after the maiden flights, then I can decide ( I have room to make them live if needed).

---Ray
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Old 10-12-2008, 08:00 AM
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More work done over the past few days......seems like the CG may be a concern using the original dimensions....we'll see how it works out in the end. Enjoy, we're gettin close now

--Ray
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Old 10-12-2008, 08:20 AM
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Also working with the cockpit (technically it would be called the fuselage I suppose) and motor installations. I am adapting a different style of wing to fuse interface.....using a horizontal brace along the midline I can locate the wing/fuse exactly 90deg to each other and greatly stiffen the junction there. Weight penalty IS a downside but I'll try to trim some fat from other places as I believe the strength nesassary.
Still to come: final sanding and shaping of the cockpit and nose.

BTW....as I am test fitting and eye-balling all this foamy goodness.....I come to realize my CG fear is deepening. Since I have located my wing LE very close to the nose of the plane, I may be in for some weight juggling miracles to keep from having to add weight to the nose. Hmmm, really didn't wanna do that!

Next is taping and assembly of the tail and vertical stabs.

---Ray
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Old 10-12-2008, 08:33 AM
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Default Moving rearward now

Assembling the tail surfaces and lining up and attaching the booms, I have allowed some latitude in my weight watching (the PLANE thank you! hehe) and upgraded my orig 8g booms to 13g numbers. Reason being is that upon research I have found that the booms on other planes of this type take a tremendous twisting force during any manuevers, making directional control sometimes difficult. I used some basswood rectangular stock for the main frame work to headoff a much of this flex as possible.

---Ray
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Old 10-12-2008, 08:44 AM
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Default pics

More photos and trial fitting of forward cockpit to wing...enjoy!

---Ray
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Old 10-12-2008, 09:04 AM
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Default Making the boom formers

OK, now we get more into the cosmetics of the plane I suppose these upper and lower formers DO strengthen the booms but that was not my initial intention.....only to increase profile appeal and provide a place for the D-Day stripes later. They are angled to try and replicate the 38's boom angles. I worked through a couple of sets of prototypes before settling on this style....hope you like it

CG and paint work to come. Thanks for following this build!

---Ray
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Old 10-15-2008, 06:11 PM
  #11  
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Default Success!

And now we come to the final stage of our project......PAINT AND MAIDEN!!! yay, rah!
The plane came out very nicely and is quite fun to fly.....amazing how a lowly sheet of white foam can be cut and glued into a neat little model aircraft: Of course a 155w motor and a few Lipo cells help quite a bit! hehe
The maiden was quite uneventful, I did have an initial CG problem but that was quickly solved with some juggling of the battery position under the wing. The plane has near unlimited vertical and will fly at below half throttle to just cruise around, stall is the same no problemo as it just kinda floats down without an issue......not bad for a flat winger (no KF or any other 'foil). The plane does all I expected in maneuvers and speed and looks very cool doing them.
All in all I enjoyed this build throughly and look forward to incorperating this plane into my regular rotation.

Lots 'o fun.

---Ray
[media]http://vimeo.com/1972633[/media]
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Old 10-16-2008, 01:51 AM
  #12  
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Thanks fella's, I am having a ball with this contest.....brings out a lot of folks talents for sure!

GA, whatcha workin on? or rather which one??


---Ray
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