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Member postings for Martin McIntosh

Here is a list of all the postings Martin McIntosh has made in our forums. Click on a thread name to jump to the thread.

Thread: Touche
08/04/2019 16:51:49

A slight correction to my previous post. Not flown this model for a couple of years and forgot that I changed the carb. back to an ST one, this time with no pressure regulator. Could not use this with a regulator since the main needle cannot not be closed down sufficiently. Surprisingly it draws fuel quite well on tank pressure alone. The spare motor is similarly equipped but has not as yet been run. Sorry if I mislead you.

As for retracts I have changed my two Dalotel ones to HK electric metal trunion types but these are very weak and need a 1/16th grp plate fitting over the top or they fracture easily. Don`t try the smaller and cheaper plastic trunion ones because the slightest side load breaks the tips of the cam.

08/04/2019 14:46:50

Hi Martyn,

Did you disassemble that Dynamix? If so, I wish you luck getting the spray bar back in the right place. They are very critical. Once got hold of a load of Webra carb. bits which should have made up several units but can only get one to work properly. The parts are often none interchangeable with sliders being of different thicknesses and they generally look as though they have been made by several different people in their bike sheds.

My Curare uses a ST61XRE with a Dynamix. Exactly the same as the one I put in my first Dalotel and did not even need a tweak during the nine years` life of the model. My spare identical motor just refuses to work but I have not tried it lately. All use a TK pressure regulator, not a pump. The one in the Curare was very finicky until I accidentally filled the tank with 20% nitro YS mix. Got to the field and put the correct straight fuel in it. Back to its old ways until I realised what I had done.

Retracts. You are injecting silicone oil into the units and the valve or are you not? They will leak like a sieve under engine vibration if you don`t.

Thread: Don't just stand there, get one up!
07/04/2019 18:26:22

Just another update. The model is now complete and ready to go. I intended to go to the field today but the weather was dull and lousy.

I applied silicone sealer to the wing seat but to my dismay the Sellotape masking pulled off some of the Diamond Glaze coating on the wing. Never happened before but easily solved.

At the last moment I decided to add a separate LiFe 1100 battery for the retracts. This gives me more peace of mind and only adds about 2oz to the weight.

Ran up the motor in the garden because I like annoying the neighbours on Sundays. Started instantly with no adjustment necessary other than the throttle low end servo travel.

Thread: Steerable nose wheel set up
07/04/2019 18:02:03

The only way I could get the cheap and nasty HK unit on my Hawk to fold forwards was to use two servos in front of it connected with wires.martin`s hawk 025.jpg

Not very pretty.

Thread: Best Heating Option For Your Hobby Shed
07/04/2019 17:46:18

After having to wait 45 days for the seller to respond I now have my money back and the damaged heater to boot. I have not tried to repair it as yet because the weather was turning much better. How wrong can you be. Electric heaters have needed to go full blast again lately.

Thread: Laser tank breather
04/04/2019 20:51:49

Mine is like that too. With fuel being drawn from the tank by the motor it cannot spill out, also the carb. needle aperture is so small that even with the motor stopped it is unlikely to happen, and if it did then the motor would be starved of fuel and stop.

spitfire 72 041.jpg

The bung is only there for transport.

Thread: A sticky glassing problem!
04/04/2019 20:42:27

Not that I had a sticky surface problem, but what I have done on my latest creation as before was to use 25gm cloth with the thinnest possible layer of resin (I tried the mini roller method this time), roughly sanded it down then several coats of `sanding sealer`, actually clear dope with lots of Johnson`s Baby Powder added, then a coat of Halfords` brush on grey primer, thinned and with more talc. Finally, after flatting, a coat of 20% clear dope unsanded to prevent the masking tape from lifting the base colour coat. A bit off thread but this is very light and quick to do. Found out the hard way.

Thread: Don't just stand there, get one up!
04/04/2019 19:43:27

Wondered what you meant!

04/04/2019 17:12:48

Easier said. I was trying to assemble the original wheel doors with m2 bolts at the time and the damned thing was about to land on my nose. A queen`s sting must be quite powerful since they use it to kill off rival newly hatched ones (or is that bees?). A few years ago a giant hornet at least 3" long emerged from the roof, a couple of feet from where I was working. It looked like a sparrow as it flew off over the house roof.

04/04/2019 16:23:01

Now nearly completed, but: there was this wasp. I could hear the familiar low drone of a newly hatched queen but could not tell if it was outside or just emerged from hibernation in my shed. I used to be super sensitive to their stings so give them a very wide berth. Next thing I knew it was buzzing around my face very angrily because it could not find the way out. I fled for the door but unfortunately my fus. was propped up against the bench in between and in my haste it came a cropper, damaging a tail tip, a big dent at the top and worst of all the irreplaceable canopy was cracked. Dents done and currently trying to do something with the canopy.

The u/c doors have given me quite a headache since the retracts are very different on this one. I first tried to space them away from the legs but they looked awful. I have just realised that if I cut the wing slots wider they would fit easily without spacers so this has been done today. Currently painting them and that should be it.

I was hoping to get it to the field soon to take more pics, run up the Laser and maybe even maiden it but this will have to wait until the weather improves again.

Final weight is a very pleasing 13 lbs 2 oz (5.95 kg) with the lighter wheels fitted, a saving of 4 lbs 14 oz.. CG is spot on with the 270gm of lead in the nose and a composite prop.

Thread: Forum members' new models: Let's see them.
02/04/2019 18:42:44

Thanks for enlightening me.

Thread: A sticky glassing problem!
01/04/2019 18:45:51

Having been bitten a few times by some brands of epoxy I now only use Multipurpose resin from ABL Resin and Glass in Sandbach. Easily mixed 2:1 by volume but you really do have to mix it well until the result is clear. I use this for moulding and skinning. (Avoid their General Purpose stuff though.) It always sets hard enough to sand easily after 48 hrs.

Very surprised that the thicker overlapped areas will not set since these should be the hardest; as has been said above this is probably due to insufficient mixing. Acetone dissolves epoxy so a wipe over with this may remove the stickiness, otherwise just re coat the affected parts.

Thread: Mills 0.75 piston and conrod replacement
01/04/2019 18:17:31

Whilst we are talking about Mills, does anyone out there have a spare compression screw for a .75? I have original .75 and 1.3 Mk 1`s from around 1946 plus a later .75 and 1.3. Only one compression screw to share between the .75`s.

Thread: Forum members' new models: Let's see them.
01/04/2019 18:07:32

Never watched slope soarers, but do you actually intend to chuck that lovely Typhoon over the edge of a cliff? What does PSS stand for, I always thought that it was Powered Slope Soaring? Sorry for my ignorance of this popular discipline.

Thread: Setting up for Flaps
29/03/2019 19:45:41

Best of luck with the maiden, glad that we were of help.

28/03/2019 18:14:00

Hi Geoff, I have tried to photograph the relevant bits from my DSX9 but the Mk1 having no backlight made it difficult. This is for my Organic which uses a single central flap servo and a V tail but these bits are easily changed. Watch out for the left hand lever since it will operate flaps and cannot be disabled.

organic program 001.jpg

organic program 002.jpg

organic program 003.jpg

organic program 003.jpg

organic program 004.jpgorganic program 005.jpg

organic program 006.jpg

organic program 007.jpg

organic program 008.jpg

organic program 011.jpgorganic program 012.jpg

Sorry, a couple are duplicated but could not get rid of them.

27/03/2019 17:30:44

You need the settings for your DSX9, nothing else. As I said above, just google it.

Thread: Don't just stand there, get one up!
26/03/2019 23:17:47

P.S.

I could lose a further 150g by using some non scale looking and slightly smaller 3.75" wheels. They would mean less lead up front as well but we shall see what the actual AUW is at the end of the day.

26/03/2019 23:01:07

Thanks Geoff.

Well, I was trying to put off getting an all up weight until the very end but with all (well most) bits added including 270g of lead to get the cg at least close it comes out at 13lbs 4oz as against 18lbs on the same set of scales so I think that I have won there. Would have been happy with 16lbs. Forgot to weigh the bare wing but the bare fus. with control surfaces was 2lb 10oz (1200g).

Just weighed the original minus engine, prop, mount, spinner and cowl and it is 13lbs.

Thread: Setting up for Flaps
26/03/2019 20:43:56

If you follow the JR manual you will never get them to work, it is rubbish. Google a full house glider set up and you should find a guide as to how it should really be done, as I had to. No idea where my instructions are now but could guide you through it if you draw a blank. Mine uses a normal throttle stick and the mode switch for launch, normal flight and crow. Quite easy to use although it would be nice to be able to disable the throttle then use the stick for variable crow braking.

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