By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Chris McG F-86 Sabre Dog build blog

my first attempt to a soaring bird for the PSSA MB 2020?

All Topics | Latest Posts

Search for:  in Thread Title in  

McG 696913/02/2020 20:11:35
avatar
2921 forum posts
1107 photos

Hello to all,

Let me introduce you to my ‘new’ hi-tech lathe. surprise

In fact, it’s a combination of my vintage - 45+ y/o - power drill and a - not much younger - trusty aviation engineer’s bench vice.

It took me some time to allow them to talk to each other as the ol’ lady has no reverse function, but finally it seemed to work.

805_lathe01_900.jpg

The idea is to bring those laminated balsa ‘twins’ to a correct diameter and hopefully try to create a kind of conical shape to them.

I prepared a ply template to get the correct bevel angle… and it worked ! … cool

808_lathe02_900.jpg

Well chuffed with it.

Hakuna matata

Chris

BRU - BE / CTR Twins Control

Phil Cooke13/02/2020 22:36:55
avatar
2390 forum posts
1640 photos

excellent... thumbs up

McG 696914/02/2020 09:40:13
avatar
2921 forum posts
1107 photos

Thank you, Phil.

It was quite fun to try it without a proper lathe... and it even seemed to work. wink

Cheers

Chris

McG 696914/02/2020 19:48:38
avatar
2921 forum posts
1107 photos

Hello again,

Next step was to epoxy the magnets and the dowels to the respective ply roundels.

811_ply_parts01_900.jpg

The rear roundel is just a dry fit to the balsa ‘twins’ so far.

The black marks on the magnets aren’t an artistic ‘essay’ at all, but simply indicate the right way to glue them in. surprise

I found out the hard way, with the Vicomte 1916, that if you miss this one, you’ll never get your bits together. Strange creatures those magnets… indecision

815_radome_bits_900.jpg

I prepared some laminations of blue foam to become the radome/spinner.

Also made up was a ply template to assist with the scale shape of that radome nose (cfr the bottom right of the pic).

Hi-tech lathe, here we come… cool

Hakuna matata

Chris

BRU - BE / CTR Magnets Control

Dave Cunnington14/02/2020 20:47:52
avatar
134 forum posts
38 photos

12/10 for ingenuity - and patience !

McG 696915/02/2020 14:50:49
avatar
2921 forum posts
1107 photos

Thanks for those very kind words, Dave.

... but don't you think "12/10" is a tiny bit OTT? ... blush wink

Cheers

Chris

Dave Cunnington15/02/2020 16:02:37
avatar
134 forum posts
38 photos

Nah, I nearly made it 13/10 but wondered if it might go to your head so I toned it down LoL

McG 696915/02/2020 22:40:53
avatar
2921 forum posts
1107 photos

laugh laugh laugh LOL ...

... no worries, I really don't need to order a larger size hat... wink

Cheers

Chris

McG 696916/02/2020 20:02:07
avatar
2921 forum posts
1107 photos

Hi there,

As things went smoothly with the balsa twins, I was very motivated to try with the foam radome nose.

I quickly understood that it was ‘not done’ to speed things up as that could be the main reason of a forthcoming small disaster.

820_radome_lathe01_900.jpg

With that motto in mind, I went easy until I obtained a 'roundish' shape, I then added a couple of marker lines where there was too much ‘meat’.

Slowly I got the shape better, but the radome was still to ‘long’.

824_radome_lathe02_900.jpg

Using the ply template, I could finally refine the dimension and shape needed for the Dog.

829_radome_lathe03_900.jpg

A big thanks to The Great Flyer for this template suggestion… but what a mess that statically loaded Blue Foam dust…

Hakuna matata

Chris

BRU - BE / CTR Lathe Control

McG 696917/02/2020 19:10:43
avatar
2921 forum posts
1107 photos

Hi

It was now about time to present and glue the laminated ‘twins’ and the rear ply roundel to the fuse.

But first they were drilled to 32mm at the centre to allow the potential nose weight to be introduced if needed.

835_radome_lamin01_900.jpg

I smeared some lightweight filler inside the ‘mouth’ as the access will become more difficult from now on. Here the pins were already removed.

838_radome_lamin02_900.jpg

No panic, gents… the red traces at the right dowel aren’t DNA left overs, but just an indication which way to install the radome… cool

Hakuna matata

Chris

BRU - BE / CTR Filler Control

McG 696918/02/2020 10:38:12
avatar
2921 forum posts
1107 photos

… oops… forgot to post this one.

I couldn’t really resist the temptation to ‘click up’ the radome nose to its ply ‘brother’…

839_radome_lamin03_900.jpg

Hakuna matata

Chris

BRU - BE / CTR Radome Control

Flyer18/02/2020 10:40:41
avatar
573 forum posts
90 photos

Impressive Chris. Look forward to seeing the finished model.

Ade

McG 696918/02/2020 17:33:31
avatar
2921 forum posts
1107 photos

Thanks for your kind words, Ade.

To be honest, I'm quite satisfied so far, but I'm really a 'slow' builder when I see the progress of other builds.

In the meantime, I'll try to keep the mojo up... cool

Cheers

Chris

McG 696919/02/2020 20:34:29
avatar
2921 forum posts
1107 photos

Hello to all,

I wasn’t really looking forward to this part, but let’s have the next ‘bite’ then.

I started to shape the blue foam around the mouth and back to F2. Tools of choice are two different diameter markers, double side taped with medium grid sandpaper. Also a larger diameter ‘magnesium complements’ plastic jar but I’m not sure the former contents are of any relevancy… indecision

844_cheek_sanding900.jpg

Please note both the markers and the vitamins jar were empty before I started to consider them as ‘tools’… angel

A few spots needed some filler - mainly at the junction with the balsa planking - but this is just a first approach before getting it ready for glassing.

847_cheek_sanding02_900.jpg

I don’t mind sanding balsa (not too much at once though!), but blue foam isn’t directly my best friend.

This time Gaston insisted to have the radome presented in place, so I couldn’t forget to post the pic, could I? …

849_cheek_sanding03_900.jpg

Hakuna matata

Chris

BRU - BE / CTR Blue Dust Control

Harry Twist19/02/2020 20:43:40
345 forum posts
251 photos

Hi Chris, that nose profile is really getting there now. Once glassed and painted it will look great. Roll on the Sabre dog!

McG 696920/02/2020 13:45:27
avatar
2921 forum posts
1107 photos

Thanks a lot, Harry.

I hope to complete the Dog's nose asap now as I still have lots to do...

Glad also that you're back to business now. yes

Cheers

Chris

Simon Ward 220/02/2020 14:12:43
avatar
36 forum posts
205 photos

Chris, the Sabre Dog's looking fantastic.

You're doing a wonderful job on the construction.

Really looking forward to seeing this take to the air off the Great Orme in June.

All the best,

Simon.

McG 696920/02/2020 18:41:19
avatar
2921 forum posts
1107 photos

Your words are really too kind, Simon. blush

Albeit I feel my progress is very slow, I try to do the best I can at the speed I'm feeling comfortable with.

But then, I never pretended the Dog will be able to fly at all... indecision

I fabricated the 'lips' for the Dog's mouth today. Glued, pinned and drying now. Delicate sanding session to follow next...

Cheers

Chris

McG 696921/02/2020 19:26:12
avatar
2921 forum posts
1107 photos

Hi,

Not much done today but in my humble opinion a tedious step forward.

The Dog’s mouth ‘lips’ - 2x 5mm balsa laminated together - were sanded slowly to shape.

And when I state slowly, I’m not supposed to reveal publicly the amount of time it took me… blush

854_mouthlips01_900.jpg

At the end of the session, I added the tiny blocks that will become the fairings for the lips.

Glad this one is nearly completed… cool

Hakuna matata

Chris

BRU - BE / CTR Lips (!?) Control

Phil Cooke21/02/2020 19:39:56
avatar
2390 forum posts
1640 photos

Chris - you've captured a complex, characteristic shape really well there though, time well spent in my opinion!

And it does take time! - Easier to take a little bit more off than put a little bit back on! laugh

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E! 

Latest Forum Posts
Support Our Partners
Slec
Sussex Model Centre
CADMA
electricwingman 2017
Wings & Wheels 2019
Cambridge Gliding Club
CML
Advertise With Us
Sarik
Do you use a throttle kill switch?
Q: This refers to electric-powered models but do you use a throttle kill switch?

 Yes
 No
 Sometimes
 Rarely

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us