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.
Attachments
IMG_0199.jpg
IMG_0198.jpg
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.
Attachments
RIMG1263.JPG
RIMG1264.JPG
RIMG1265.JPG
RIMG1266.JPG
RIMG1267.JPG
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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.
Attachments
IMG_0205.jpg
IMG_0206.jpg
IMG_0207.jpg
IMG_0208.jpg
IMG_0210.jpg
IMG_0211.jpg
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