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Oct 07, 2015, 05:50 AM
Slow builder
_AL_'s Avatar
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Discussion

Paul Janssens P40


I've decided I need to build something a little more suited to the local slopes before I commit to another 60+" heavyweight PSS for the Manilla Slope Fest.

Paul Janssens P40 should fit the bill nicely with a span of 940mm (37") and weighing in at around 700g (25oz).
I'll resist the urge to totally modify it from the plans with the possible exception of a thinner airfoil.

The plans were printed on the weekend & I've managed to find enough scraps of foam to build the fuselage though I'll have to glue some smaller bits together.
This one isn't a lost foam plug/ glass fuselage. The basic shape is cut from foam & laminated with balsa to form a box of sorts. The top & bottom are balsa & foam sanded to shape.
It should be simple & relatively fast to build.

Nothing too exciting tonight. I've found 2 pieces of foam wide enough when laminated together but 60mm too short. They are now glued & under weights to cure overnight.
Tomorrow I'll add a 60mm long piece to the end & that's the plug ready to cut. Messy but it'll work.

Al
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Oct 07, 2015, 05:55 AM
Aerotow and sloping Holland
MaartenX's Avatar
Cool. Good to see that you are starting the build of this nice plane.
As you know I have build several of the PJ plans now and I have stuck with the airfoils as per plan. This has not disappointed me. All fly well in a surprising range of conditions. My T33 has an Eppler 387 airfoil which should make it mostly a floater but I have flown it without ballast in 30 Knots with no problem. You might want to consider leaving it as it is if you want it to fly on a bunny hill. Ofcourse the choice is yours.

I like the construction method and will be following you closely.

Maarten
Oct 07, 2015, 08:05 PM
Slow builder
_AL_'s Avatar
Thread OP
Thanks mate.
I'm going to trust your judgement & stick with the original wing.

I glued the 60mm extension on this morning & the plug is now cut.
A bit rough but it'll do.

I'm sneaking in on the night shift later so no more progress till tomorrow.

Al
Last edited by _AL_; Oct 07, 2015 at 08:11 PM.
Oct 07, 2015, 08:40 PM
Crafter of flying plugs
Owen Hedger's Avatar
I will be watching this keenly as I have an Idea for what I want to make for a smaller PSS.
Oct 08, 2015, 01:18 AM
Aerotow and sloping Holland
MaartenX's Avatar
Quote:
Originally Posted by _AL_ View Post
Thanks mate.
I'm going to trust your judgement & stick with the original wing.

I glued the 60mm extension on this morning & the plug is now cut.
A bit rough but it'll do.

I'm sneaking in on the night shift later so no more progress till tomorrow.

Al

Good call.

Did you use cardboard as a template for cutting the foam core?
Oct 08, 2015, 01:20 AM
Aerotow and sloping Holland
MaartenX's Avatar
Quote:
Originally Posted by Owen Hedger View Post
I will be watching this keenly as I have an Idea for what I want to make for a smaller PSS.
Will you design it yourself or build from plan Owen?
Oct 08, 2015, 05:38 PM
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by Owen Hedger View Post
I will be watching this keenly as I have an Idea for what I want to make for a smaller PSS.
What happened?....Back aches?!
Oct 08, 2015, 06:28 PM
Crafter of flying plugs
Owen Hedger's Avatar
Quote:
Originally Posted by MATIN View Post
What happened?....Back aches?!
No, my launchers are getting old.
Oct 09, 2015, 03:38 AM
Slow builder
_AL_'s Avatar
Thread OP
This is looking like a very easy way to build a model. I'm using Cardboard templates for the fuselage.

Unfortunately I didn't make it to the hobby shop before closing time so I couldn't laminate the fuselage tonight.
I've cut all of the formers out & I'll start cutting out the tail surfaces later tonight.
More pics tomorrow when I have some balsa to play with..

Al
Oct 09, 2015, 07:37 PM
Registered User
ian murdock's Avatar
Oct 10, 2015, 12:08 AM
Slow builder
_AL_'s Avatar
Thread OP
OK. Advice #1 for anyone doing a build using this method.
Don't break up the fuselage foam offcuts & throw them away until AFTER you laminate the balsa.
No biggie but this step would have been much easier had I thought ahead.

1.5mm ply & 3mm balsa laminated on with PU glue & clamped up.

Al
Oct 10, 2015, 01:57 AM
Aerotow and sloping Holland
MaartenX's Avatar

Paul Janssens P40


Note to self: keep Al's advice in mind....

@Al: how are you going to do the linkages in the fuse?
Did you install a bowden cable in the foam before sheeting it?
Oct 11, 2015, 03:19 AM
Slow builder
_AL_'s Avatar
Thread OP
I haven't worked out the linkages but most likely I'll just poke a hot wire through the foam & run the linkages through that.

I've have a very family oriented weekend so not a lot of time building but some progress none the less.
I'm using PU on all laminating so far with good results but it means 4 hours between tasks.
This will be dry in about 1 hour so I may get a bit more done before bed.

Al
Oct 11, 2015, 05:18 AM
Aerotow and sloping Holland
MaartenX's Avatar
Good progress !
Oct 11, 2015, 05:36 AM
Slow builder
_AL_'s Avatar
Thread OP
A little more.
Lots of sanding next week.

Al


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