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Member postings for Martyn K

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

Thread: 1/8 scale AB Models PSS MB326 Impala
19/08/2019 09:37:05

Looks great. Watching

Thread: Fouga magister 1/4.5 moulded from scratch
17/08/2019 19:43:42

Wow.

How does the cost stack up for a scratch built model like this.

It really is glorious

Martyn

Thread: An Introduction to the PSSA 2020 Mass Build Project
15/08/2019 09:41:25

My kit arrived yesterday. Nice quality wood and nicely cut and a beautiful plan.

Thanks Martin & Gordon

Thread: Martyn's F-86 Sabre Build Blog
13/08/2019 16:23:53

Thanks both

and yes Martin... Very helpful

Thread: Fouga magister 1/4.5 moulded from scratch
13/08/2019 11:54:14

Thanks Dirk

13/08/2019 09:36:59
Posted by dirk tinck on 24/05/2019 23:47:05:

Sealing with PVA20190519_211703.jpg

This is an amazing How-To.. Thank you.

Is that a block of PVA? I have only ever seen it in liquid form..

Martyn

Thread: Martyn's F-86 Sabre Build Blog
12/08/2019 14:52:51

A few more to keep the appetite whetted

colour-scheme.jpg

f86-524959-a.jpg

f86-524959-b.jpg

cockpit.jpg

May start work on the artwork stencils while I am on holiday. That Skyblazers logo looks challenging

Martyn

12/08/2019 14:48:07

Hi Martin - responded by email but yes please...

Alan - Loud and proud - I like inspirational schemes

12/08/2019 13:13:55

As we have started bagsying (I haven't used that word since I was kid - far older than the spell checker reference dictionary) colour schemes, I have decided to go with this very loud scheme. It will be a real test of my painting capabilities.

Bring out the dancing girls laugh

I'll get my kit when I get back from my holidays hopefully. At the moment desperately trying to get some of the WIP models finished

Martyn

Thread: Jet Provost 1.5metre Andy Blackburn PSS Plan
07/08/2019 09:33:38

Watching this one as well...

Thread: Best Dremel Clone
07/08/2019 09:29:10

My mains powered Dremel is well over 20 years old, the best powered tool I have ever bought. Gets abused every day.

Thread: Sukhoi SU-26
30/07/2019 13:33:55

A little bit more progress.

The secondary silencer is the same as used and referred to by club member John Miles in this month's RCM&E. The biggest difference is that I made up my own manifold from and old tuned pipe header. Hopefully, it will be effective. John didn't mention (I don't think) in his article that the secondary silencer - although straight through - has actually a dense lining of sound absorption material in the outer wall.

Here is the cockpit servo layout,

dsc_0795.jpg

Trying to keep it as neat as possible. The two flight batteries are mounted on a 3mm ply plate just in front of this, the ignition battery is a 2000mAh eneloop NiMh and a 2S 200 LiPo for the receiver and servos. The CG is exactly as per instructions - although IMHO, its too far forward but I will leave it as recommended for the first few flights.

The model is ready for flight..

But ...

By now, I was hoping that it would have flown, but I am having problems getting the engine to run. Looking at the piston, it has no evidence of being seriously run in the past. I have plenty of ignition sparks and they appear at the right time. The engine will fire and run for a few (3 or 4) seconds then just dies. It has all the symptoms of fuel starvation but the plug is getting wet. At the moment, my flicking arm is tired and I am running out of patience/ideas.

The H and L settings are set as per the engine recommended settings and I am trying to start it at a fast idle (looking at the butterfly). I have tried slight adjustments on the L setting up to 1/2 turn each way but it dos not appear to make much difference.

The two diaphragms in the carbs look OK and there is a good seal on the crankcase pressure pipe (to drive the fuel pump).

So still trying to get over that hurdle. When I get a reliable run at home then I'll maiden it.

Martyn

Thread: Who says flying thermal soarers is boring?
20/07/2019 10:43:40

Thermal soaring is IMHO, one of the most challenging and enjoyable aspects of model flying. It doesn't have to be expensive, the vids show moulded carbon models, way out of my price range. Older wooden gliders can be picked up for buttons or you can still build your own. Have a look at F3-RES class which is very popular in the USA and on the continent. A 2m wingspan limit with technology restrictions. Must be mainly wood.

Martyn

Thread: Sukhoi SU-26
20/07/2019 10:16:34

Thanks Rich. The CDI has a do not exceed voltage of 6v which limits me to using a 4.8v Nimh or similar. All the servos are HV so will be using a 2S LiPo for the flight controls.

A couple of missing photos

dsc_0796.jpg

The CDI instalation

dsc_0797.jpg

Exhaust layout

dsc_0799.jpg

I use these. A relic from my aviation days to fit retaining sleeves on clevises.

dsc_0801.jpg

Cooling. Nice big inlet area at the front but I can't see any way of getting the hot air out. There are 6 holes around the firewall to vent into the fus so I could cut a couple of holes in the belly behind the undercarriage. The only other option is to cut a big hole in the cowl which I am reluctant to do.

Any thoughts on this?

Thanks

Martyn

19/07/2019 22:25:30

A bit more progress. This model is all about fitting out, there isn't much construction.

dsc_0786.jpg

I mentioned that I had cocked up the hole for the plug, mainly because I hadn't allowed for the angle of the plug when I measured it, SO its a bit elongated - nothing I can do about that now.

dsc_0787.jpg

The cowl is secured by long s/s self tappers that screw through the g/f cowl into these neat little receptacles. Never seen these before but they certainly seem effective. There are 4 of them at 90 degree spacing with the first at about 45 degrees from vertical. The wire is the throttle linkage that terminates on a ball link on the throttle arm

dsc_0788.jpg

Like this. The engine has self unlatching choke. However, comments on RCU suggest that its really needed.

dsc_0789.jpg

The prop arrived from propguy. The size I wanted (18x10) wasn't available so we discussed and settled on a 20x9. However, I am still worried about ground clearance on take off and landing. There isn't very much..

dsc_0790.jpg

These props are truly a work of art,

dsc_0791.jpg

Tonight, I have been fitting the CDI unit and cap. This meant cutting another hole in the cowl to let the HT lead out..

dsc_0792.jpg

A simple slot was easy to cut out. The CDI unit is fitted on the lower reinforcement piece just behind the cylinder head. Held in place by 2 screws screwed into a beech block. (Photos to follow)

dsc_0793.jpg

As Gordon alluded, we have a problem with noise at our flying field and are making lots of effort to keep noise down to acceptable levels. These engines are not quiet but we have been experimenting with these secondary silencers. from an eBay retailer. They are quite a small canister made of stainless steel but packed with sound deadening material. Experiments indicate they are quite successful. We shall see.

Link

The canister is held in a tool clip which has a long M4 bolt passing through a length of ali tube . The tube inner has dowel inserted at both end drilled centrally M4. A strap will prevent the tool clip from losing the silencer.

dsc_0794.jpg

You can see a square piece of 10mm ply which is partially drilled to take the ali tube which is epoxied into the ply which is epoxied into the floor of the fus. It may need a little additional reinforcement.

Epoxy setting over night, tomorrow, I'll do the elevator linkages. The rudder has been done. using a crossed close loop system. I'll post photos later.

For the ignition cut out, I am going to use an RCXL optical switch. The question I have is whether this needs another battery isolation switch between the battery and the optical isolator switch. I suspect that when the ignition isolator is off that the quiescent current will be negligible and a battery switch can be ignored. The battery (NiMH - 4.8v) will be disconnected at the end of a days flying.

Your thoughts please.

More to come

Martyn

18/07/2019 09:16:44

Thanks Gordon

That's really helpful. I will follow your guidance (as usual )

Martyn

Thread: show us your scale glider
18/07/2019 08:17:22

finished.jpg

My completed Foka 4.

Thread: How to Attach Photos
17/07/2019 11:38:35
Posted by Jonathan M on 15/07/2019 17:35:53:

Second from the right on the top line above where you type a post is an icon of a camera (next to the smilie).

Click on this camera icon and you'll be directed to your album(s).

On your albums page click on the picture you want to upload the click the green OK button at the bottom.

The picture will then appear in the body of your text.

If you have two or more albums, select the relevant album first, then the picture.

You can't do a bulk upload, just one picture at a time, then go back to album and select another, etc.

Edited By Jonathan M on 15/07/2019 17:37:14

Just to add to that, when you have inserted your picture, click on the photo (which will get a blue border to show its selected), press right arrow to move the cursor - which will deselect the photo, then press <enter> a couple of times to generate a bit of white space. At that point you can add more text or another photo.

Martyn

Thread: Think I've been spammed!
17/07/2019 09:37:17

I got involved in a scam last year and parted with £75. As soon as I realised it was a scam (about 2 weeks after I place the order), I contacted the bank and they refunded the money and reversed the transfer. In my case I bought from a pop-up website (in Canada) advertised on FB which promptly disappeared.

 

You need to explain the situation (having no PP account is quite valid IMHO). They may ask you to wait a few days in case the goods do turn up but my bank (HSBC) were outstanding in the way they dealt with it.

Martyn

Edited By Martyn K on 17/07/2019 09:37:51

Thread: MF's Hawker Fury Mk1
16/07/2019 10:58:47

Love the lith work. It looks great

Martyn

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