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Member postings for Robin Colbourne

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

Thread: Your experience of Banggood delivery time?
06/03/2020 11:33:19
Posted by SIMON CRAGG on 06/03/2020 06:48:56:

I ordered some of those Lipos last year. To date they still have not arrived. It took me three months to get the money back. Never again!. HK UK and got them in three days.

The impression I get is that the sellers either aren't aware of the Royal Mail's ban on delivering Lipos, or just take a chance on some getting through and refund on the rest. The Royal Mail must have one enormous pile of seized Lipos somewhere!.

06/03/2020 00:40:56

A friend was telling me how several of the people with whom he works get their orders from BangGood and Aliexpress sent to their office, as they aren't home when the postman arrives. Given the long delivery times, most have usually forgotten what they ordered, so its a bit like 'Secret Santa' when they open their parcels!

Thread: Where can i buy 2mm pushrods 750mm long
04/03/2020 10:53:12

Christopher, I haven't tried carbon pushrods myself, I've always used snakes, or, in the old days, 1/4" square balsa pushrods (which I wouldn't recommend).  On throttle linkages, I've used bicycle bowden cable inner with soldered-on snake ends, in tube similar to those in your picture

Given that carbon rods have unidirectional carbon fibres, I would think that using the clamp screw type connector runs the risk of crushing and splitting the carbon fibre rod.

I would be tempted to use snake ends epoxied on with 24hr epoxy, after thoroughly abrading and cleaning (with IPA or meths) the end of the cut to length rod and the inside of the snake end (if you can get a needle file or broken Abrafile into the snake end to abrade it, so much the better). Only do one end at a time, so the position of the first snake end is fixed before attempting the second.
Gently warming the snake end once it is on the carbon rod, will ensure the epoxy thins out and wets into abraded carbon.

If you drill a hole in a piece of wood the size of the threaded end of the snake end, then put it in a vice with the open end pointing up, you can stand the carbon rod in it vertically.  The epoxy will then form a nice fillet and not run down the rod. When you do the inner one on the model, slide the rod in from the tail and have the model pointing nose down to do the same. You can have the snake end attached to a clevis and the servo arm on the servo, so that end is fixed. The weight of the carbon rod should hold it in place, or you can rig up a rubber band at the other end pushing it in.

Edited By Robin Colbourne on 04/03/2020 10:57:08

03/03/2020 20:41:45

SLEC Snakes

or 2mm carbon fibre rod

Thread: Merco Engines
26/02/2020 09:28:09

Here is Mike Billington's Engine Test of the Como 51 in control line stunt form, courtesy of Sceptreflight: Como 51 Engine Test

Thread: I have Got This Far Should I Just Fly it
26/02/2020 09:18:26

With regard to propeller rotation for a twin, both the P-38 Lightning and F-82 Twin Mustang reversed the direction of rotation between the prototype and production aircraft. In the case of the F-82, the airflow over the centre section was so bad that the middle part of the wing between the two fuselages was stalled and the prototype could not leave the ground!

In other words, try both options and see which works best on your model.

Thread: all good things eventually come to an end !
24/02/2020 20:58:15

Stuphedd, I can appresiate the pain you're feeling. At RAE (Royal Aircraft Establishment) Farnborough we had much the same, with the use of taxiways as runways and large grass areas for thermal soarers, There was enough space that the gliding club and aero club could use the appropriate into wind runway without us getting in each other's way. The bi-annual airshow did put a damper on things for a few weeks, but we could live with that. The change from an MOD airfield to a business jet airport was the death knell for the club. Weekend operations were the beginning of the end. Nowadays a row of hangars stands on our usual site.

Looking on the bright side, the fact that the majority of powered models are either electric or four stroke these days, it should be much easier to find a site that can accommodate you. Club fees which cover the cost of field rental, site security and cutting your own grass are all aspects that take some getting used to.

Are the Bedworth and Burbage Aeromodellers a friendly bunch? They look like your nearest established club.

Edited By Robin Colbourne on 24/02/2020 21:25:42

Thread: Is this weather ever going to get better!!!!!!!!!!!!!
24/02/2020 16:57:47

Romeo Whisky, I love the DUKW. If I ever won the lottery, which, given that I don't buy the tickets, is rather unlikely, a DUKW is what I would buy! I blame Airfix for this particular obsession.

Going back to the weather, given that there are only two types; building weather and flying weather, I'm looking forward to this being a truly classic year for new models, particulalry scratchbuilt, from plans and 'proper' kits. Even some of those ones lurking part built in the roof or on top of the wardrobe stand a chance of getting finished and flown.

All that is needed now is some good excuses and artful dodging to avoid the wife/girlfriend with the household 'to do' list.

Thread: Centrifugal clutch pads - from where ?
06/02/2020 19:27:58

You could try Bonz-MX, formerly 'The Ped Shed' They sell spares for Chinese quad bikes, engine driven scooters and mini motos. The most recent phone number I can see for them is 01252 378398 They are in Mytchett, Surrey GU16 6DJ

 

Otherwise, what about theses 52mm clutch shoes?  52mm Clutch Shoes

Edited By Robin Colbourne on 06/02/2020 19:36:52

Thread: Thin Ply
05/02/2020 16:02:43

Nigel, In the design you are building, What is the thin ply used for?

  • Could doublers be replaced with laminations of hard balsa?
  • Could hard points be reinforced with layers of well keyed plastic (e.g. PET or ABS) plastic epoxied on?
  • Could balsa reinforced with cyanoacrylate be used to harden specific areas?

If thin ply is the only thing that will work, and you only need tiny bits, can you get some scraps from a fellow modeller or just buy the ply and keep the rest 'in stock' for your next build?

There is a usually more than one way to skin a cat!

Robin

Thread: Balance point help, advice needed for a Flea!
01/02/2020 01:21:36

According to this Flying Flea Design Notes

Henri Mignet started with the CofG at 41% of the front wing chord, and eventually moved it to 50%, so it may well be that if you are applying conventional aeroplane C of G rules, you've got it too far forward.

Thread: OS FSR engines
01/02/2020 01:11:39

Richard,

'If it ain't broke, don't fix it'!

Have a good look in the exhaust port and if that and everything else looks and feels ok, use it 'as is'. Keep the spare piston & liner for when you really need it.

Selling my 40FSR is my big modelling regret. I'm keeping my eye open for one too.

Robin

Thread: dope lifespan
21/01/2020 14:43:23

Thunderstreak, Like you, I looked at the H Marcel Guest site last night and saw the 12 month mention. That is most likely intended for full-size users and is the peiod in which HMG would entertain any complaint about deterioration in quality.

Even in full-size circles, 'use by' dates can be extended subject to the material passing an appropriate test. This is particularly the case with epoxies for which a 'coupon' (test sample) would be kept, and a tensile test piece done if appropriate.

Edited By Robin Colbourne on 21/01/2020 14:43:34

Thread: engine refurb
20/01/2020 16:29:54

Hi Richard,

I used to use oe which came in a small can with a brush in the lid. It was quite effective but left the engines looking a bit grey. I think Betterware did it.

A lot of carbon removers contain Sodium Hydroxide, so aren't safe for aluminum. This one advertises that it is ok:
Repairing Products - 'Carbon Off' carbon remover

This is the data sheet: Carbon Off Technical Data Report

Carbon-Off! Burnt on carbon remover


If you have an engine or silencer you're not too sentimentally attached to, I would try whatever you use on that first.

Thread: Trendsetters and Iconic Models over the Years?
19/01/2020 23:25:27
Posted by Chris Channon on 19/01/2020 11:56:23:

Yamammotto, Premier Preceptor, Precedent Hi-Boy, Precedent Bi-Fly.

Chris, you've just answered a question I've been meaning to ask, namely, 'Who made the Preceptor?'
I borrowed one from a friend to give lessons for quite a long while, but never knew who kitted it. Apart from rather too soft main legs that were forever bending back, it was a wonderful four channel trainer, and flew really well on an OS35FP. The one I flew had a silicone tube from the outlet on the silencer to just by the right hand main wheel, so it didn't get covered in goo either.
I can't find a picture of a Preceptor anywhere though. For those that have never seen one, it looks like a slightly anorexic MFA Yamamoto.

There are lots of good suggestions coming through. I would never have thought of the F-27 Stryker, but I take Kiwikid's point. Maybe the original question should be broken down by decades? The Tauri and Ugly Stick are definitely classics; the Ugly Stick, in particular, being much copied through the years, and even influencing such classics in their own right as the GWS Pico Stick; I bet that would have surprised Phil Kraft!

Thread: how to launch a glider
18/01/2020 20:54:21

That reminds me of trying to hand launch a Galaxy Wizard with the Solarfilmed fuselage covered in castor oil. As soon as the throttle was opened the nose would tip down causing the prop to try and slash my wrist.
Happy Days!!! laugh

Thread: Do you love some of your engines so much you don't fly them?
18/01/2020 14:10:18
Posted by Nigel R on 18/01/2020 13:11:02:

Crikey

Fancy selling any?

I'm looking out for a nice pumped os 46 sf...

Typical! its always the good engines people want to part with. Its never, "Got a mk1 MDS40, Flash 35, or a Merco 35, caked in burnt-on castor?' laugh

Edited By Robin Colbourne on 18/01/2020 14:16:15

Thread: Hi from me and my KK Fairey Gannet build
17/01/2020 20:09:55

How about using the mechanics of an electric contra-rotating helicopter to drive the propellers? A walk around any decent sized car boot sale should yield at least one.

Alternatively these flying balls sell for under a fiver.

Flying Ball Contra Rotating Helicopter

If you want to see a complicated model, check out this control line Gannet from 1963. Two engines and 24 bearings in the gearbox: Bruce Randle's 1963 control line Fairey Gannet

Edited By Robin Colbourne on 17/01/2020 20:10:20

Thread: Trendsetters and Iconic Models over the Years?
17/01/2020 12:49:09
Posted by Dave Cunnington on 17/01/2020 12:18:35:

How about the Thunder Tiger Trainer ?

Flair Cub ?

Both good calls Dave! No shortage of either in their time.

17/01/2020 12:10:51
Posted by wingcoax on 16/01/2020 23:43:07:

Robin, what about the "mascot"

Wingcoax, I guess it depends where you are. I've only ever seen/flown one DB Mascot, but they may well be the default trainer in some clubs.

Edited By Robin Colbourne on 17/01/2020 12:11:03

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