x/c revisited

[kevin6Q]

Hello all,
Just curious if anyone's made progress on the inexpensive x/c ship idea? Dean? Thanks, Kevin

[SoCalGliderFlyr]

What's inexpensive?

So far:

[ejett]

SoCal:

I must say that looks pretty spiffy. When are you going to have a ribset available? Do you have a timeline on this kit/semi-kit?

EJ

[SoCalGliderFlyr]

Just going back through the wings to make it buildable. Found that I could increase the span a bit so I did! Need to reconcile the ribs and lay them out for laser cutting. The tail assembly is done. Might have a couple of rib sets cut for proto typing. How is your building time?

[fly1milehi]

Thats looking SWEET!
All of my LIMIT EX builds are done! What size carbon laminate should i start buying for the spar caps??

Greg

[ejett]

Right now it is still good.

EJ

[SoCalGliderFlyr]

1/2" wide center section spars. 0.030" top and 0.014" bottom should be enough. 48" long, two each. Center section is one piece. Removeable 36" tips. 3/8" x 0.014" for wing tip top spar. 0.007" for wing tip bottom spar. Thinking about splitting the center section into two panels.

[fly1milehi]

I would think a one piece center panel would be both stronger and lighter without having to find/spec a wing joiner and tubes.. my 2 cents not that you were really asking..

[ejett]

Well, maybe so, but a one piece center panel will be about 2 meters in length.

Of course, the fuse may be nearly that long as well.

BIG plane!

EJ

[solo6796]

Is that a glass or wood fuse?

AJ

[SoCalGliderFlyr]

Typical wood fuse. 3/16" hard balsa behind wing and medium hard 3-ply under the wing and forward. No liteply. 1/4" square hard balsa longrons. Could be spruce. Would require more nose weight.

Original fuse did not have the 1/4" square longrons (corners) and used 1/8" material. Also used lite ply for bulk heads. I prefer medium or hard (5) ply. Especially at the wing dowel bulk head.

Still the same amount of space allocated for where the thermal sensor and additional batteries were located. Reduced height of fuse forward of the wing where the servos for the rudder and elevator are located. Looks more like a large Paragon with Gemini overtones.

The wing center section would be 90.75 inches. This is why I would think about a four section wing.

Note that all changes have been discussed with Ed Slobod.

[fly1milehi]

okay then.. 90inch center section does pose some definate transportation problems... I stand corrected now that I "see" the actual dimensions... Isn't it going to need to have a dihedral bend in it? Maybe a welded steel tube for the joiner???

[SoCalGliderFlyr]

A 3/8" OD by 1/16" wall steel tube should do it. doesn't have to go too deep into the wing -- about 5 inches. Tubes would angle into the wing for the dihedral.

Then the glass and foam XC ships have 96" wings. So it could remain a single section.

[solo6796]

You will probably bend the 3/8" joiner on a windy day launch, I think. We have been using 1/2" solid aluminum main joiner in the Hawk (126"), and old Jack STILL bends them!

I'm very interested in your project. I'd try building one, Lazer cut ribs help the build a LOT!

AJ

[SoCalGliderFlyr]

Could go to 7/16" OD tubing with 3/32" or even 1/8" wall. Have to measure what's on the Mako. Haven't been able to bend it.

Didn't think there would be a challenge in launching in 1981. From reports they used a hi-start with two men pulling.

[kevin6Q]

Sounds like a nice ship. My idea of inexpensive was to get the plane into the air for less then $400. Kit, radio, betteries, etc.. If the pilot wants to add telemmetry and such this is at his or her option and not part of the $400. Nice to see the activity on the subject. Kevin 6Q

[steelhead]

THE ODR/XC project is coming along, but I am still waiting for a meeting and some materials delivery for the project.

Its happening :)

Great job on the PARAMOUNT

Dean

[SoCalGliderFlyr]

Wish the Paramount project would go faster. This having to earn a living sure cuts into the hobby time!

[big jer]

With regard to launching, this is an X/C model, not a TD model. A 200 ft launch that leads to a thermal is just fine. If it takes 2 or 3 launches to get the thermal, so what if the goal is a 10K O & R or 30 mile straight out or 2 hr thermal flight. Zoom tows are not called for or needed.

I liked to use the biggest surgical tubing I could get, either .5 or .625" OD with a .125 wall. 50 feet of tubing with 300 feet of line behind and at least 50 feet of line in front. Want to know why? Well if you are hand towing a large model and the towline breaks, that rubber is coming your way and it hurts if it gets ya (breaks the skin, feels like being kicked in the balls if it gets you in the groin). One man can hand tow a model like the Paramount. Course, if you hit big lift on tow, he can fly too. YOu have a chase car handy right? Use this high start with the tow car, that is my preference. and is the quichest way to do multiple re launches. JDK

BTW, Plans look good

[steelhead]

Socal-

Anything? Havent heard much lately, just relighting the fires!

Dean

[SoCalGliderFlyr]

Guess I better finish up the drawings. Been diddling with them off and on. Always finding something that needs a tweak.

[steelhead]

Has the Paramount risen from the drawing board yet?


Dean

[SoCalGliderFlyr]

Multi millon dollar house remodel design keeps getting in the way of everything. Here is the original with out material call outs and dihedral angles.