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Old Jul 15, 2012, 04:53 PM
I like real wooden aeroplanes!
Sundancer's Avatar
South-west France
Joined Sep 2007
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I continue to be impressed by your progress Colonel, nice work. Yes RHW wrote on a multitude of subjects as well as aeromodelling. Today I have been working on scaling up the Mercury Mars plans, a Warring creation, it is starting to look interesting and hopefully I shall be cutting balsa this week. In the meantime I have finally finished the Mamba drawings and they are winging (well, as much winging as La Poste and the Royal Mail ever do) their way to Kevin at Q&EFI for publication later this year.

I hope you are enjoying the building as much as I am enjoying following your build thread!
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Old Jul 15, 2012, 10:18 PM
Sic itur ad Astra
sparks59's Avatar
United Arab Emirates, Abu Dhabi, Abu Dhabi
Joined Aug 2009
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Good progress Colonel. I'm also enjoying reading your log.

Don't be too hard on yourself, the U/C seems to be turning out well!

For wing dowels on these small planes, I have recently used bamboo skewer sticks. They are not as round as dowel, but reasonably light and strong, and they only cost a quid for a bagful!
sparks
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Old Jul 16, 2012, 03:22 PM
So I'M meant to be in control?
Colonel Blink's Avatar
Ilkley, West Yorkshire, UK
Joined Nov 2008
3,550 Posts
Thanks for your kind words, gentlemen.....it's much appreciated!!

Soldered up the second u/c leg this evening - unfortunately the 'axle' parts are not in line so I will need to apply a bit of brute force and ignorance to them. I seem to have got to the point that I have heard in the world of full size homebuilt aircraft - 90% done, only 90% left to do!! I am also starting to get some sideways looks from Lady Blink; presumably partly because of the number of times I am scooting up to the loft.....and partly because she spends so much of her time horizontal and calling for another large Pimm's.

And thanks to sparks, I have taken custody of a bag of Bill Morrison's finest kebab skewers - 100 for less than one Great British Pound (ie 99p).

I also collared our Health & Safety chap for some dust masks today - I have found that my sensitivity to balsa dust is getting far worse than expected - now the slightest wipe of sandpaper can make me sneeze the roof off, and any half serious shaping will have me wheezing all night
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Old Jul 16, 2012, 03:33 PM
I like real wooden aeroplanes!
Sundancer's Avatar
South-west France
Joined Sep 2007
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It's always the fiddly bits that take the time Colonel. Looking on the bright side, if you do have a balsa dust allergy, a model like the Ajax, all sticks, is the best one to build, no vast areas of sheet or huge chunks of block to produce shed loads of dust. I don't get any funny looks from Mrs Sundancer when I disappear into what currently passes for a workshop, she says that she at least knows where I am and that I am not "up to anything"! But I do make sure that I provide her with an opened and nicely chilled bottle of vin blanc before decamping.
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Old Jul 17, 2012, 03:15 PM
So I'M meant to be in control?
Colonel Blink's Avatar
Ilkley, West Yorkshire, UK
Joined Nov 2008
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Well, the undercarriage still only counts as 'just about acceptable' but throwing some wheels on it and wheelbarrowing it across the carpet seems to indicate a reasonably straight track - so I'll stop whilst the going is good. Added the wing dowels this evening, and then..................well, I had resisted it for too long!
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Old Jul 17, 2012, 03:24 PM
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"wheelbarrowing" ..... I love that description!

Nice work, Blink!
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Old Jul 17, 2012, 03:59 PM
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For working in "half hour interludes" you've accomplished a lot. And on top of that, what you've done looks great! Very nice, Colonel!!

David
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Old Jul 17, 2012, 04:29 PM
I like real wooden aeroplanes!
Sundancer's Avatar
South-west France
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Definitely a proper Ajax Colonel. Pretty damn good!
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Old Jul 19, 2012, 07:53 AM
So I'M meant to be in control?
Colonel Blink's Avatar
Ilkley, West Yorkshire, UK
Joined Nov 2008
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Ta very muchly, all - I must admit that I'm reasonably pleased so far!!

'This week, Oi have been mainly a-soldering' - just getting the same connectors on the ESC as Lipo, and making up adapters to my normal XT60 connectors for charging and so that I can check the system with my Wattmeter...

Question for all you learnèd jellyspoons out there - what are your favourite hatch retention methods? I will need two on the Ajax - one will be on the underside of the nose, as I am intending the ESC & Rx to go within the sheeted first bay of the fuz to counterbalance the two servos right down the ar...sorry....back end, and another under the centre of the fuz just behind the u/c for access to the Lipo.....
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Old Jul 19, 2012, 08:53 AM
RFJ
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Quote:
what are your favourite hatch retention methods
Magnets

Ray
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Old Jul 19, 2012, 09:03 AM
I like real wooden aeroplanes!
Sundancer's Avatar
South-west France
Joined Sep 2007
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Quote:
Originally Posted by Colonel Blink View Post

Question for all you learnèd jellyspoons out there - what are your favourite hatch retention methods? ..
No contest Colonel - it has to be magnets. I tend to use a little ply lip or dowel at the front, depending on the hatch configuration, and a magnet or magnets at the back. Get your magnets from www.first4magnets.com - thousands of different types available, I use the 5 mm diameter ones and am well into my second batch of 50 now. I also use 'em for the nose cowlings, with a cut-out which locates over the 1/16" ply motor mount square to provided side-to-side registry. Taking my courage in both hands I also used two at the back of the Sportster wing with a dowel at the front - extremely neat and so far the wing hasn't fallen off despite my best efforts to dislodge it. Drill a 5 mm dia hole and stick them in with CA. NB: make sure you get them the right way round, it is quite disconcerting to have your hatch fired across the room when you try to fit it. How do I know.......??

These little magnets are amazingly strong, I have also used them to fit custom made fly screens (essential in summer here) to all our windows including Velux type ones.
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Old Jul 19, 2012, 09:28 AM
So I'M meant to be in control?
Colonel Blink's Avatar
Ilkley, West Yorkshire, UK
Joined Nov 2008
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Thanks! Thought that would be the case, but was concerned about weight - but looking at the link that George posted, they are very light after all. And the 5mm x 3mm ones [F640] are currently on a '3 for 2' offer - but as I cant really justify £14 on 75 magnets, I'll probably just buy 25........
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Old Jul 19, 2012, 11:10 AM
Sic itur ad Astra
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United Arab Emirates, Abu Dhabi, Abu Dhabi
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I buy small magnetic 'mushrooms' from the Daiso Japanese oddment shop. They cost about a pound for a bag of about 10. I squeeze with the pliers and the little powerful magnet is released. Cheap, effective and most importantly, available locally!

sparks
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Old Jul 21, 2012, 03:52 PM
So I'M meant to be in control?
Colonel Blink's Avatar
Ilkley, West Yorkshire, UK
Joined Nov 2008
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OK then, magnets have been ordered as have the mylar, Esaki Liteflite and Balsaloc......... oooooh, me poor wallet!!!

I've spent the odd session this week fuz furtling - reinforcing the screw areas for the servos, sheeting in the nose, making a hatch for the underside of the nose for access to the ESC.....

I now believe that the Rx can go further back than I had originally thought; I can't be sure exactly where at the moment because I have found that all the BA screws I have are too big for mounting the motor, so I've also had to order some M2 screws & nuts (I have ordered both steel and nylon - I may use the nylon as a further 'crumple zone'). These should arrive in a few days time.

Without the motor on the front, it's a bit difficult to ascertain where to nail the other hardware for balance.. Also, there is no CG marked on the plan - I'm assuming it should be somewhere around about the main spar???? Also I'm assuming that I should get the bare fuz/empennage to balance a bit nose heavy on the grounds that there will be more covering behind the CG than in front - or do you experienced chaps have some other secret piece of trickery you can let us in on?????

The build seems to have slowed slightly at the moment; but it'll seem to race on again once the covering starts......ulp!
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Old Jul 21, 2012, 09:39 PM
Sic itur ad Astra
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United Arab Emirates, Abu Dhabi, Abu Dhabi
Joined Aug 2009
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Colonel, I usually check the centre of gravity without exploding any grey cells, by popping the measurements into the boxes at the following page link

http://adamone.rchomepage.com/cg_calc.htm

sparks
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