CARF Yak55 SP 3.3m Build

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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Sat May 12, 2018 6:43 pm

The titanium nuts, washers and 90mm long bolts turned up today. For anyone who has ever wondered how much of a weight saving the change in material provides, below are a couple of images.

40.72g in steel VS 20.54g in titanium, for each of the 4 sets of a 90mm bolt, nyloc flange nut, plain lock nut, large diameter washer and two standard sized washers.

So, an 80.72gram (2.85oz) saving. I'm hoping to save a good 200g or so on the weight of the engine mount, plus another 100g with a change of the baffle material selected for this new Yak55 over the old one. So, its required throwing some money at the problem, but all together I hope to save 380grams (0.84lbs) off the nose.

B.
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Last edited by Billy Bunter on Sun May 13, 2018 8:44 pm, edited 1 time in total.
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Sat May 12, 2018 7:19 pm

Just received an email from Nick with some photos:

Hi Stuart, Good to see you today. Attached pictures. With some careful adjusting everything went together as designed. I will add the servo mounting when the aluminium spacer is removed to measure position:

Dry assembly: Checking fitment.

Initial bonding: Bonding the bottom end plate and aluminium pillars. Also added two laminations of carbon across the pillars to the outer moulding.

Poraver: After bonding the cross plates in place the Poraver/epoxy mix was added and the top end plate bonded in before closing the mould and clamping up.

More on Monday.

Best wishes,

Nick.
Attachments
Dry assembly check.JPG
Initial bonding.JPG
Poraver.JPG
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Re: CARF Yak55 SP 3.3m Build

Postby dwazzer on Mon May 14, 2018 7:55 am

Now THAT is attention to detail...!

This is going to be stunning when complete...Nice one! :D
Lots of planes......And a VERY tolerant Wife...!!!
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Tue May 15, 2018 8:52 am

Some more images from Nick - - The pieces that Nick has added to the engine mount are there to mount the throttle servo.

Looks like I'm on track to hit my target to loosing 200g off the weight of the mount.

B.
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Sun May 20, 2018 5:42 pm

I picked up the Yak55 from Nick on Wednesday and have done quite a bit of work on it since then., I remembered to take some images on Friday, which are below.

I'll take some more tomorrow to update on the work I got done over this weekend.

B.
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Re: CARF Yak55 SP 3.3m Build

Postby Andrew Bird on Mon May 21, 2018 7:04 am

Really like the mount - nice idea! Coming together nicely now.
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Mon May 21, 2018 9:40 am

OK, so here are a few more photos of the weekend's progress. Jobs I got done were:

Fitted the Powerbox servo lead bulkhead fittings
Fitted the Powerbox servo leads for the tail surfaces
Fitted the tray with the POwerbox and receivers mounted to it
Made up the tuned pipe mounts and fitted the pipes/headers
Plumbed in the tanks and smoke pump; secured the tubing in place
Fitted and secured in place the smoke pump/throttle servo leads
Finished the cross brace and fitted it
Fitted the 6-inch wheels and spats
Got the cowl fitted

Very pleased with how this is looking. About a day of my time required to finish this now - its getting close.

B.
Attachments
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Mon May 21, 2018 9:44 am

More...

B.
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Mon May 21, 2018 9:53 am

For anyone who is interested and to help organise myself with the final build tasks, here is a list of the remaining jobs:

1). Drill the prop
2). Cut the spinner
3). Plumb the smoke pump to the headers
4). Mold up an ultra light-weight up a carbon tube to route the servos leads in the tail
5). Glue the servo formers into the stabs
6). Fit the elevator linkages
7). Fit the aileron linkages
7). Secure the elevator servo leads in the stabs, so the line up with the corresponding fittings in the fuselage
8). Secure the aileron servo leads in the wings, so the line up with the corresponding fittings in the fuselage
9). Make up the servo leads from the fuselage aileron lead fittings to the Powerbox and put servo plugs on the ends of them(ANDREW, WHERE ARE YOU....?)
10). Balance the model and work out where I need to attach the RX batteries to get the right CofG
11). Plug in all of the servos to the Powerbox, then set-up/program the Powerbox

B.
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Re: CARF Yak55 SP 3.3m Build

Postby Billy Bunter on Mon May 21, 2018 4:59 pm

Managed to get the prop drilled, along with the spinner backplate. Tomorrow I'll cut the spinner cone for the prop openings.

Also managed to lay up the carbon for the servo lead tube. Process is:

1). Take a piece of copper pipe
2). Tightly wrap it with (very greasy) grease proof paper
3). Carefully slide on the carbon brade
4). Apply resin evenly and leave to dry

Of the 60g of resin I mixed up, I used 40g. So, this should be pretty light once I'm finished. Waiting for the West Systems epoxy to go off now.

B.
Attachments
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