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Member postings for Bob Jennings 1

Here is a list of all the postings Bob Jennings 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: Bob's PSS Nimrod MRA4
22/10/2019 11:58:34

She's now starting to fill the shed!

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I'll get some more work done on the centre structure to a point where I'm happy to leave her so I can get the Mass build Sabre done before Christmas! Yeah, right....

22/10/2019 11:53:26

With quite a few formers in the centre section and the alignment of the nose mounting tubes to consider, I did a dry fit of the central core structure that everything hangs off.

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Phenolic wing spar tube is 38mm diameter.

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Happy that everything was pretty darned square, the glue and angle section balsa tied it all together.

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Creative use of clamps squares and elastic bands kept everything straight at the front end.

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22/10/2019 11:35:11

Okay, where were we? Oh yes, finishing off the season on top of the Great Orme! What a brilliant day. Very busy!

The 'rod has cracked on apace.

I had the rather tricky task of how to fit the tailplanes in a fashion that was detachable... the principle is easy to imagine. Transferring the loads to the rest of the airframe caused some head sctatching.

The tail planes are at a 6 degree dihedral each side and at a negative incidence of 1 degree. This was set without the tailplane on the fuselage by angling some stress plates with some insert jigs at the correct dihedral and raising the aft jig by 1 degree to the datum. The design of the stress plates, mounted in the correct orientations allows the tailplanes to simply slide on!

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Measuring the torque rods for the elevators, driven by dual Bowden cables, will allow me to close up the rear fuselage ready for glass. Then it's a case of attaching the linkages and fairing over this rear section with the detachable tail boom.
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A bit out of sequence, this is how I glued the tailplane tips with gorilla glue...

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... with holes in a ply plate to let the glue flow through to the balsa. This was shaped to section once it cured

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Centre section next!

Thread: PSSA Gliding Events 2019
16/10/2019 11:34:15

Pete, you're a star. Love Pauls photos too.

Thread: Jet Provost 1.5metre Andy Blackburn PSS Plan
11/10/2019 15:30:39

Good move. Keep at it Pete, this is really useful and interesting.

Cheers

Thread: F86 "Gamma" Build
04/10/2019 11:17:04

Must clear the Nimrod off the bench first though!

Edited By Bob Jennings 1 on 04/10/2019 11:17:40

04/10/2019 10:11:40

Bringing any more kits to the Orme next weekend? Bought my additional wood in readiness!

Thread: Jet Provost 1.5metre Andy Blackburn PSS Plan
04/10/2019 10:05:17

Can't wait to see the physical comparison to mine when you have this done Pete. Brave pioneering!

Thread: Bob's PSS Nimrod MRA4
03/09/2019 15:23:25

Devil's snot... yep, I can see that. Yep, a thin layer of epoxy may win out when I'm glassing the rest.

Edited By Bob Jennings 1 on 03/09/2019 15:24:47

03/09/2019 15:22:11

Yes, I got on a roll and just remembered to keep taking some photos when I got to the end of a session or a key bit.

WBPU sprung to mind too and I guess a thin epoxy would also work well.

03/09/2019 15:13:23

I was thinking of using a spirit based sanding sealer just to seal and fill the grain.

03/09/2019 15:00:26

Fin skins, chamfered at the trailing edge to allow a shrouded rudder housing.

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All glued up and clamped.

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Progress shot.

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And the rudder. Trying a balsa and 1/32' ply structure. It won't need glassing just primer and paint. Not sure if I'll save any weight, but you have to try these things. It will be stiff though.

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Making sure to take photos sometimes slips my mind, there's so much to do but I'll keep shooting the key bits.

Thats it for now.

03/09/2019 14:59:29

Tail end halves coming together. Squaring up the formers and fixing in place.

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Checking it's all true, up and down. Fin core is polystyrene.

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Spruce stringer in place. I decided to cut the stringer notches after laying the stringer in place and marking before using a square file to create the notch inside the pen lines.

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The formers are thick enough to butt up adjacent panels. A bit of relieving is usually needed to get a nice tidy fit.

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Back end space for the tailplane assembly.

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Closing up the bottom section to add some stiffness.

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Now... I had an utter mare with the nose section and to make it right required some surgery to my beautiful planking. Lesson learnt and I need to re-draw the formers on my plan at some point.

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It was emotional taking a saw to it. But I'm glad I did. Meanwhile, the wings arrived! Happy day.

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Just need the centre section building now. All the flappy bits in the wing need making up plus the nacelles and tippy bits. The tailplane needs jigging and fairing into the back end. Lots still to do.

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Wings are a good size.

Getting down to business with the twin bowden cable outers for the elevator.

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I used some of the lightening holes to support the cable runs.

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Once they had been thinned down.

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The MAD boom sorted. Balsa formers and solid blue foam wrapped with brown paper and PVA. Incredibly light. I thought spiral wrapping the paper might add some structural integrity. As if it needed it!

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The tailplane needs to have a secure fixing so I'm fashioning these stress plate sandwiches to enclose the tubes to allow the tailplane halves to slide on. It will make sense later. The idea is to set the dihedral and incidence with these plates in the fuselage.

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A bit of tail fin detail.

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Fin skins, chamfered at the trailing edge to allow a shrouded rudder housing.

Thread: Jet Provost 1.5metre Andy Blackburn PSS Plan
02/09/2019 12:53:12

Gonna need more space to replicate this shot!

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29/08/2019 10:10:10

Hi Pete, I use a trusty red BIC and lightly pass it over the wood so as not to damage the grain at the rib position. Just a thought. Well done for getting this started. It's already looking familiar. Not sure when I'll get around to making my 'Big brother JP'. Hope you decide to install the twin lights in the nose.

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Edited By Bob Jennings 1 on 29/08/2019 10:30:31

Thread: Bobs F86 Sabre
15/08/2019 10:07:19

At last I think I'm sold on this one.pic_slideshow.php.jpeg

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Pretty simple masking and I'll need an easy paint job to get this finished.

Thread: Bob's PSS Nimrod MRA4
13/08/2019 12:30:09

Cheers Andy. I'll be buying pins and glues at Barkston... as well as a beer or two.

Thread: sabre made in Belgium
13/08/2019 12:22:08

Ooooh that's nice. Yes, it looks fast standing still!

Thread: Bob's PSS Nimrod MRA4
13/08/2019 12:18:04

I seemed to get carried away and Here the topcracked on attaching the tail end formers to the balsa spine without taking any photos! Here the upper skin has been attached with the stringers in place.

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I reduced the skin thickness to 3/32 in the hope that it will keep the weight down... It certainly bends better. No ammonia used here. The back end is open so I can install some reinforcement for the tailplane seat and rods.

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Used most of my pins and found my stash of binder clips!

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This is by no means an easy build. The structure is a beautiful shape, but there's so much to think of that I hadn't considered on my very 'general arrangement' plan. The tail section may well be the first section completed with servos, wiring and flying surfaces attached.

More later.

13/08/2019 12:02:25

I hit a profile snag on the nose, so I'm leaving it to germinate!

The tail section is next and the formers essentially create a cone that needs reinforcement for the tailplane. There also needs to be access for the elevator linkages as the tail is a slide fit in two sections with the strakes added as flexible plasticard. That MAD* boom needs to be as light as humanly possible, way out at the back! (*Magnetic Anomaly Detector)

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