Jart from scratch

[billscottni]

Most people will know of the Jart, but for those who don't check out;

http://www.jartworld.com/

Plans used to be free, but now are $10. I've had mine for a looooong time and only just getting round to building. The Jart is available to buy in a couple of versions, but being a tight Scotsman, I'm going to build from scratch.  Model has a glass fuz which I'm going to produce using the lost foam method. The best explanation I've seen of this can be found here: http://www.pjmodelclassics.be/ under Building Methods. Basically you shape the fuz in foam, glass over that and then melt out/remove the foam. The wing will be a standard vac bagged blue foam. The original is a one piece, but I'm going to make the wing removable for ease of transport.

Started tonight, by making templates for the fuz,



I then cut this from blue foam and shaped it before starting to cover it in strapping tape:



More to follow as it gets done

[JohnPearson]

Hi Bill

Please, please, please, please sir! can I have one of these.

JohnP

[billscottni]

Make yourself the fuz and I'll get the wings and tails done for you!

[joe]

Looking forward to this build Bill. I got a Jart LT. Like you, I got the plan off Reed ages ago but never got round to it.
Those just cardboard templates? Cut with a hot wire?
I built a 2 metre U2 from a PJ plan. Lost foam fuse. Good quick way of making a decent fuse. Plan on doing another few in the near future. Have a few more PJ plans that need building.

[billscottni]

Hardboard templates! It was what was lying around the garage! Seal the edges with cyano or epoxy, but it does burn if you don't keep the wire moving.

Yes Hot wire cut and the lots of sanding.....bloody blue dust gets everywhere.

Cut off the vertical fin to shape it using SD8020 templates and will stick it back in place before I glass it.

Prnter has packed in, so I will have to wait until monday to print wing and tail templates for the cut

[JohnPearson]

O.K. Bill

Thats a deal, I will call with you this week some evening, I have to call into Ian's to finish the Elan.

JohnP

[JohnPearson]

Hi Bill

Just on the BMFA website, and seen this Jart for sale at £250, not cheap

http://www.bmfaclassifieds.co.uk/detail.php?id=5013

JohnP

[billscottni]

Half the appeal of this model when it first came out, was the fact that it HAD to be built from scratch. That's still the appeal for me.

Although you can buy them now, thy're still not available in huge numbers.

[billscottni]

Joe,

I take it PJ is Paul Lanssens?

What's your next build from his plans?

[joe]

Yeah, meant Paul Janssens.
I've had a few of his plans knockin' about for a while now. I will go for either a 1.5m Seafury. Which will be a decent size with chunky fuse. Or a 1metre Mirage 2000. The Seafury is foam veneer wing and fuse. The Mirage is a lost foam fuse and a built up wing. Both have been scaled up from the original plans.

The original 0.72metre version


Original 1.12metre version

[billscottni]

I'd go for the Seafury, but then I like prop jobs.

[Fred]

Suscribed to that one !  

Not finished yet !!??  

[billscottni]

Not yet. Printer's playing up so can't print out templates for the wing.

[billscottni]

Some movement on this build.

Joe very kindly offered to cut me a set of wings using his cnc cutter. These arrived today and are far better than I could have done with templates and my drop arm cuttter.

I have attached the vertical fin to the fuz and tomorrow will finish fairing it in to the main fuz. Then I'll be abe to apply the carbon, kevlar and glass.

Will add pics as I go through the stages

[billscottni]

Fin attached to plug and ready for fairing in. Then I'll get the glass and carbon on it before melting out the foam. Put a couple of balsa ribs in the fin for strength.