I thought this might be fun for some of you.

When Bob and I decided on the next plane we were working on for kitting, we narrowed it down to the JetMach SuperSport (in my avatar) and an a bigger version, JetMach UltraSport for P-120 power.

We went ahead and finished up the SuperSport and are now starting on the UltraSport.

So I figured it might be fun to keep a sort of running blog on this process.
From the drawing to the laser to the building to the flying field.

I'll try to get some stuff rolling today.

Ok, to get the ball rolling.

First we had to measure the p-120 and create a drawing of it.

Then we took the side view of the sport jet and enlarged it fit the P-120.
This resulted in a scale up of 1.25 and gave a wing span of 100".

This works out nicely, the weight scaled up to 34 Lbs using our MAPC sofware [link=http://store.laser-design-services.com/index.php?main_page=product_info&cPath=4&products_ id=42](found here)[/link], with a wing loading of 44 Oz/Sq ft.

Now we have to enlarge the laser cut parts by the scale factor and rearrange to fit the laser cutter's wood size.

Then the wood sizes in the formers and structure have to be changed to fit the design purpose, and commonly available wood sizes.

saweet.. i've been waiting for an inexpensive 120 size jet so i can let some of the local club members have a had are flying a turbine... might just have to pick me one of these up

I've also been sitting on a new in the box P120SX that I cant wait to get going in this project

Hi Ronnie,

How much fuel with the large plane hold?

Great project, BTW. I think a lot of us old timers have a spare 120 sitting around!

1 gallon will fit just perfect

that should do fine, might even have some spare room in front of it for smoke juice

make the legs long enough to add an external centerline drop tank.

and make it built up so it can be inexpensive and hold a dubro tank... now that would be sweet!

Sounds like plenty, is it a milk jug or something? I am growing to dislike these overpriced kevlar tanks, gilding the lily if you ask me. A nice PET bottle would be great, simple.

EDIT: and start the design with some specific trailing link gear designed in! And big tires, 3 inch mains minimum. Funny you weren't asking for all of this free advice, were you!

It's a 1 gallon juice bottle.

Funny you mention the legs.

The SuperSport is actually wearing 1/7th L-39 legs, which look fantastic on this plane and work awesome. Also has a Pro-Link nose strut.

So the plan is to find some 1/5th L-39 legs, wheels and brakes or something close to the same from Pro-Link.

So yeah trailing link was the plan from the get go

Sounds very interesting...... keep the info coming.

Thanks
Rick

Man-This a great thread. Looking good you two. I know a few around here that has waited for this one. K12RC. It's your time man!!!!! this might be a first. At least for me anyway, seeing how you are showing us what you are doing from the ground up. Keep the info rolling. Some vids of the lazer cutting would be a gas!!!

Kind of overdue for a post, but we were gone all last week and in Waco at the jet rally.
Just a quick update today.

This the layout of the fuselage sides, set up for laser cutting.
Each fuselage side is in three pieces, they are joined together and then laminated to the other fuselage sides, two laminations for the main fuselage and one more lamination in the higher stress area of the turbine and wing blocks, the fuselage joins are staggered for each lamination.

cutting some parts

some finished ribs

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A little off topic but how about a small version 36' to 42' span for the Lambert or JetJoe Junior turbine. Could probaly cut the parts out of the scraps from this one.

actually that would work on our jetmach sport-e

http://store.laser-design-services.c...products_id=43

Kewl.... 2 piece wing?

Love the 1 gallon fuel "jug"

PaulD

OK!, I'll look at reducing the size.
Bob