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Member postings for John Stainforth

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

Thread: Sign of the times - funnies
23/05/2020 13:08:48

Another reason to like glowplug i.c. engines!

Thread: adhesive for hinges
25/04/2020 13:55:20

Robart themselves recommend white glue or epoxy. I usually use 30 minute epoxy (I surprised you can't get that in Canada, e.g., by mail order), but aliphatic glue would be fine. I very carefully oil the actual hinges with demolding vaseline and make sure that I get none on the pins, which I usually wipe over with methylated spirits to be sure. Because the pins are barbed, the glue actually doesn't have to bind well to the plastic, only to the wood - and then the strength of the attachment is a good as the strength of the glue itself or the surrounding wood.

Thread: ED Super Fury Carburettor
12/04/2020 11:06:54

My brother and I had an ED Super Fury in the early sixties and I am sure it had no plastic parts. It was our favorite model diesel engine, with a fantastic performance.

Thread: If bored from lockdown
30/03/2020 01:44:00

..or try going back to drawing!

Thread: Vibration absorbing engine mounting
30/03/2020 01:39:55

As far as I can remember, Saito do not recommend these kind of "soft" mounts at all.

Thread: NEW POLL - do you use a throttle kill switch?
24/02/2020 23:08:16

I also think that a kill switch should be an industry standard, like failsafe. I set up the switch on the top right back of the transmitter, and when taxying an i.c. model, for example, I keep one finger hooked round the switch toggle so that I can kill the engine instantly.

Thread: Modes 1 or 2
14/02/2020 23:45:16

I am in the US at the moment, and rest assured Mode 2 absolutely dominates - virtually no one flies Mode 1. I think this is because there is more cross-over with full-size aviation: there are for more modelers who also fly full-size planes in the US compared with the UK.

Thread: Seagull Hurricane Laser
12/02/2020 17:34:12

The fullsize Hurricane did not have a standard 12%-ish thick wing section at the root, but a whopping 18%. This was one of the main reasons it was 40 mph slower than the Spitfire. This is how the wing sections compare:

Hurricane ClarkYH cambered 18% root 12% tip

Bf 109 NACA 23 cambered 14.8% root  10.5% tip

Spitfire NACA 22 cambered 13%  root  6% tip

The drag coefficents of the Hurricane's wing section were much higher than the Spitfire at low Reynolds Numbers, so a thick wing model Hurricane would be particularly bad in this respect.

Overall the Spitfire's wing had a quite extraordinary performance, a late model in 1944 achieving the highest speed of any piston engined aircraft, I think. I also remember reading somewhere that Sir Sidney Camm regarded putting such a thick wing on the Hurricane a his "biggest mistake".

Edited By John Stainforth on 12/02/2020 17:36:08

Thread: Covering a sheeted surface in tissue and dope.
03/01/2020 04:08:49

Seeing JD8's photo of a Mercury Matador reminds me of sketch that my brother found that I did in 1965 (in blue and red biro) of our single channel RC Matador. We called it "Matador 2" because we essentially rebuilt the whole plane, beefing it right up by adding LE sheeting and covering it with nylon fabric. By it's designation "S12", it was already our 12th model aircraft. (We starting making model aircraft and other things around 1959!)matadorjsketch-0381.jpg

Edited By John Stainforth on 03/01/2020 04:13:27

Edited By John Stainforth on 03/01/2020 04:15:49

Thread: The Gov't, CAA, BMFA & UAV legislation thread
02/01/2020 23:56:46

There's some bad news from America today. The FAA are proposing some much tougher rules on model and drone flying there. Why is this relevant to us? Because we end up following very similar rules, with a time lag.

Thread: Dust extractor
24/12/2019 14:33:27

I bought a Jet air filtration system about 8 years ago. Worked well up until a few months ago, when the motor packed in; nice and quiet with three speeds. The filtration unit uses a standard-looking A/C filter. I sanded parts directly in front of the filter. All the fine dust goes straight into the filter (which can be cleaned out by banging against an outside wall). The heavier stuff falls onto the floor beneath where it is easily swept up.

The only snag was the cost, which IIRC was about 160 pounds, which stuck me as rather a lot for what is basically an electric motor in a tin box. I see that the current equivalent model is now over 300 pounds.

Thread: A new caption competition - winner declared!
02/12/2019 02:44:22

"I am the Ghost of Brexit Future"

27/11/2019 13:21:49

I am Vlad the Impaler. I grabbed your plane out of the air, I can grab barbed wire fences with impunity, and now I am about to grab your face!

Thread: Laser Engines - Technical questions
21/11/2019 18:35:55
Posted by Jon - Laser Engines on 21/11/2019 13:07:34:
Posted by John Stainforth on 21/11/2019 12:49:26:


I think there would be a significant demand for an inline 50cc glow engine amongst the scale fraternity.

Incidentally, what are the problems of using methylated spirits as a base? (Would the piridine coke the engine up?) Dirt cheap and readily available.

Meths is not likely to be very pure. My guess is it wouldnt be a very consistent fuel and im not sure how a gluwplug would take it. Its also more expensive than methanol from what i can see.

As a side note, its the oil and nitro which cranks up the price of glow fuel. Go skinny on both and you bring the cost down.

And i admit, this is only my opinion, but if you take a warbird like the ones being referenced here is fuel cost really an issue? Minimum 350 for the wood, perhaps the same again for retracts and oleos, another 200 at least for radio gear. An engine could be 300-700 depending on what you get, so call it 500 as a middle ground. Now we are up near £1500 and we could easily spend another 500 on bits, paint, a pilot, spinner, scale details..whatever. So, if we call it an 1800 - 2 grand model, does it really matter than you used 20 quids worth of glow fuel to fly it for a weekend? To me 20 quid for a fun weekend out in the sun (yea right) is cheap.

Jon, I totally agree with you re the cost of glow fuel. I think it's a vastly exaggerated issue. Most model flyers I know (including myself) spend far more on ethanol-containing beverages than on glow fuel - without batting an eyelid!

21/11/2019 12:49:26


I think there would be a significant demand for an inline 50cc glow engine amongst the scale fraternity.

Incidentally, what are the problems of using methylated spirits as a base? (Would the piridine coke the engine up?) Dirt cheap and readily available.

15/11/2019 16:21:24
Posted by bert baker on 15/11/2019 15:24:00:
Posted by John Stainforth on 15/11/2019 06:54:49:


Is it really such a good idea to hang a weight on a crankshaft? I would be interested in Jon's opinion.

The boat brigade, car and helicopter fans have done it for many years,

Good point.

15/11/2019 06:54:49


Is it really such a good idea to hang a weight on a crankshaft? I would be interested in Jon's opinion.

Thread: How much does an RC hot air balloon weigh?
05/11/2019 19:05:01


No conundrum. Your model plane in the air weighs essentially the same (mass times gravitational acceleration) as on the ground.

Thread: Design assistance request!
03/11/2019 11:45:43

Rhino has a beautiful command called Sweep in which on "sweeps" a cross-section along one or two "rails". The command Sweep2 uses two rails. For wings that have the same (scaled) airfoil section throughout, one selects the airfoil section with a mouse click, and the planform lines of the LE and TE of the wing (to use as rails) and preferably the point at the very wing tip, and bingo, the whole surface of the wing is produced instantaneously.

All the 3D drafting programs have a myriad of ways to loft surfaces, and the trick is to find what works best in a given situation.

Thread: Laser cutting
10/10/2019 12:46:25

Belair Kits do a very good job.

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