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MAK 15 MP

My new project

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Rob Ashley08/08/2018 21:51:48
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Wow, talk about something a bit different Peter! Really interested to see this develop.
Peter Miller09/08/2018 08:06:03
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I keep wondering what I have lt myself in for!!!

At least I have a whole new collection of problems to sort out which makes it very interesting

Geoff Peacock10/08/2018 00:29:17
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Hi again Peter,

I haven't forgotten the MAK 15, but progress is slow, due to other modelling getting done, outside in the sunshine! However, now that summer looks to be coming to an end, I actually got about an hour on the MAK drawing today when it rained for a while, but there's a lot to sort out, as you said.

Quite a challenge, all this 30-dimensional thinking, but I might possibly have something to show you soon. I'll PM you with a .pdf for you to look at, comment on, criticise or whatever - once I get a bit further.

Peter Miller10/08/2018 07:58:05
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Hi Geoff.

You have my sincere sympathy!!!

I have done my drawings and cut out a lot of the parts. and am now doing dry runs on the centre section and modifying as I go. I still have one or two or three problems to sort out.

I will let you have my pdf drawings t look at if you PM me your email address.

Geoff Peacock10/08/2018 12:54:20
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Posted by Peter Miller on 10/08/2018 07:58:05:

I will let you have my pdf drawings t look at if you PM me your email address.

PM sent.

Peter Miller14/08/2018 11:06:17
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Right! Building at last. THis one is turnng out to be a bit more of a problem. I keep finding things that are not quite right on the drawing ans also realising that some tchings need changing a bit.

Here is the basic centre section of the wing and really most of the fuselage

dscf4088.jpg

There are four carbon fibre tubes, two each side for the wing joiners. The white paper tubes between the spars are for the servo leads tothe ailerons. I am hoping just to feed the servo leads through to a Y lead in the cabin area.

dscf4089.jpg

This is the front view with front carbon tube showing. The paper tubes need to be swept forward a bit more at the root.

There is quite a lot of sheeting and cap strips to be added

dscf4090.jpg

The fuselage pod is very simple. THe formers a re glued to the crutch. The ply formers have balsa edges to allow for pinning down the planking. and also to give much more gluing area for the former with the undercarriage leg.

The ESC will slide in under the motor and battery platform.

dscf4091.jpg

Top view of the pod frame work. The black is velcro on the battery platform. Not sure just how far forward or back the battery will need to be.

dscf4092.jpg

Dry assembly of the pod and wing. The pod will have some of the planking done before it can be glued on.

Geoff Peacock14/08/2018 16:44:14
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Looking good Peter - I'm envious, mainly due to you being much further on than I expected, and much further on than I am!!!

The last thing I want to do is copy your ideas, so I'll have to break out the thinking cap and come up with something all my own soon.

I've been busy finishing off my latest effort over the past few days: I made all the transfers yesterday and fitted them today, so there's just one small hatch to modify and it's time for flying, if the weather improves.

Peter Miller14/08/2018 18:06:38
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Hi Geoff

Really been slow progress as I have\ been so tired lately.

No reason not to take ideas from other designs./ and especialy insist on refusing to take inspiration and ideas from elsewhere.

Hope the test flights go well.

Geoff Peacock14/08/2018 20:48:02
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Posted by Peter Miller on 14/08/2018 18:06:38:

No reason not to take ideas from other designs/and especially insist on refusing to take inspiration and ideas from elsewhere.

More a case of adopt/adapt rather than actually copy in this case, I think, but your take on the Clark Y 'foil appeals greatly. That looks likely to happen.

McG 696914/08/2018 21:00:49
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Just to be sure...

... Clark Y or your preferred Naca 3414, Peter?

Cheers

Chris

Peter Miller14/08/2018 21:08:05
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Hi Chris

This model is basically a glider so Clark Y is a great choice.NACA 2414 or3414 are great for sports aerobatic models-

I remember a glider design in Flying Models. The chap was winning competitions and all the other competitors who were flying models with facy Selig and Eppler airfoils asked him what he was using on such a sensational winning desing.

His answer was "Clark Y"

Peter Miller17/08/2018 15:07:34
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Well, got quite a bit more done,

The centre section has been sheeted

dscf4095 - copy.jpg

Ther underside has extra sheet at the rear for the exit of the snakes

dscf4096 - copy.jpg

The wing is built flat onthe board. Stage one, all the spars laid down and lower L.E sheet.

dscf4097 - copy.jpg

The trailing edge is a bit more complicated with some 1/16" sheet and the the trailing edge shaped from 1/8 sheet. Rear spar is spruce as it doesn not have the suport of the leading edge sheet.. The 1/16 sheet reinforces the joints in the T.E.

dscf4098 - copy.jpg

 

dscf4099 - copy.jpg

The centre section is propped up 1/8" on the side away from the wing being built. This will give the correct dihedral, about 1/2". Then the ribs are fitted and the carbon fibre rods.. Apart from rib one the ribs do not give much support to the rods and indeed the holes have to be adjusted to get the rod properly aligned with the centre section tubes.

The webs between the tubes and spars give it the strength

Success,The wing slides into the centre section perfectly!! Miracles will nevexr cease.

dscf4100 - copy.jpg

Detail showing the spar, rods and webs

dscf4101 - copy.jpg

Now the rest of the sheet etc can be added and the aileron built.

Edited By Peter Miller on 17/08/2018 15:11:36

Rob Ashley17/08/2018 17:08:06
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224 forum posts
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Coming along at great speed Peter.

Peter Miller17/08/2018 17:28:06
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9294 forum posts
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10 articles

Faster than I expected. Just waiting for the disaster to strike!!!

Geoff Peacock17/08/2018 20:12:17
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192 forum posts
68 photos
Posted by Peter Miller on 17/08/2018 17:28:06:

Faster than I expected. Just waiting for the disaster to strike!!!

Wow, Peter - haven't you got anything else to do, like gardening, going to the pub, doing the washing & ironing, etc? thinking

Peter Miller17/08/2018 21:08:18
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Gardening???!!! I have about a 3rd of an acre of which 80% is pure jungle and I mean jungle. Even got the odd deer living in there at times. I occasionally mow the grass and wave a hedge trimmer over the worst bits.

Pub? Nope I have a couple of tots before bed.

Washing? it takes five minutes to stuff it all in the washing machine and another five to hang it on the line.

Ironing? Nope.. I do cook proper midday meals. I even hoover a bit. Always know when it is time to hoover the stairs...when the balsa chips reach the bottom step.

Mind you, I also build fast.That progress is done in about a couple of hours a day maximum.

Peter Miller27/08/2018 10:52:01
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Right! Quite a lot of progress now.

The top pof the fuselage pod has been planked. The bottom has not been planked as I need to align the crutch with guide marks inside the root ribs to get the correct angles.

dscf4108.jpg

Inside the pod the mounts for the rudder and elevator servos have been fitted. With this model a lot of the installation has to be done on a cut and try basis.

dscf4109.jpg

This is the underside view showing the hatch on which the aileron servo is fitted.. The bellcrank has been cut down by one hole to get it to fit.

dscf4111.jpg

Top view of the aileron servo and push rod. It is a bit fiddly but it works well.

dscf4110.jpg

The wing panel with the aileron. The sheeted areas are scale and are at the hinge and horn locations. I will add a central hinge.

dscf4107.jpg

The pod has now been glued to the centre section. There will be another former in two parts glued to the centre secrtion and the planking wil go back to that. The extreme rear of gthe pod is made from small blocks.

dscf4112.jpg

The basic model assembled At 70" span without the tips it looks pretty reasonable. and it weighs just on 16 ounces. My target weight of 3 lbs is looking very hopeful

dscf4106.jpg

Rob Ashley27/08/2018 12:27:36
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224 forum posts
81 photos

Starting to look very birdlike there Peter. Your building speed is still impressive, alas work gets in the way of my progress.

Looking forward to seeing this airborne

Best

Rob

Peter Miller27/08/2018 13:19:08
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9294 forum posts
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10 articles

Hi Rob.

Building speed is fast but not perfect by a very long way.

However they fly well and don't fall apart in the air. They look good at 50 feet.

Peter Miller05/09/2018 18:35:14
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Right, Got on with the model and it is now ready for covering. I can say that fitting all those capstrips on the wings is a bit tedious

mak 5 sep (2).jpg

This underside view shows the exits of the snakes, also the cooling air exit It may look small but this is really a glider so not going to thrash the motor

mak 5 sep (3).jpg

The tail surfaces. These are pretty large but they are working with a very short moment arm.

mak 5 sep (5).jpg

The pattern for the canopy took vast amounts of 1/2" sheet. It has been laminated and quite a bit is now in tne rubbish bin.

mak 5 sep.jpg

Now for covering. I have only seen two photos of the aircraft. One was dark all over, the other is light coloured. I based my CO2 version an the dark picture and thought that red would be suitable for a Russian aircraft.

I have emailed a major Russian Air force museum but they haven't answered. I also emailed The Vintage Glider Club but again no answer although I know that they do tend to be verty helpful

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