Here is a list of all the postings Robert Welford has made in our forums. Click on a thread name to jump to the thread.
|Thread: What glues do you use?|
Evo-stik PVA: hardwood joints; balsa-ply; ply-ply
Aliphatic: general balsa-balsa structures
Hysol (Aeropoxy): composite- plywood/balsa; composite-composite
JB Weld: metal-metal; metal-wood; carbon-wood; carbon- metal
Araldite 24: general high stress areas
CA: very rarely use it. I don't enjoy the experience!
|Thread: The Alpina is back!|
I thought that Tangent owned the IPR on the design of the Alpina, but there's nothing on their website. This moulded version looks identical with the current Tangent Alpina. I wonder whether the wing section has been changed.
I noticed that Tomahawk Aviation do all-composite 1/2 scale ASW 27, ASG 29 and ASG 32 costing > $5000, so the new Alpina Carbotec is a budget product!
I had a Multiplex Alpina 25 years ago that was a lovely glider. Unfortunately, the all-moving tail crank broke when flying it loaded with ballast and inevitably "bit the dust". I currently have a Tangent Alpina Carbon Pro waiting to be built. The wings are very stiff compared to all other versions. I must build it ...
|Thread: Top marks to Modelfixings.|
Yes - I have always received a great service from Modelfixings. Thank you Ian
|Thread: Multiplex telemetry issue.|
I had issues getting SRXL to work on some Multiplex receivers. The solution was to update the firmware in the receiver to latest version.
Try updating the firmware in both sensor and receiver using the Multiplex launcher program.
|Thread: Flaps. Servo speed.|
Richard: what are your concerns with the new Cockpit SX 7/9/12?
I own a SX9 tx, but have yet to use in anger as I have few other Mpx transmitters in use.
|Thread: Laser Engines development.|
I would be pleased to trial 180 petrol in either Toni Clark Super Cub or Acro Wot XL.
Jon, as you know I'm a user of your engines so I would be interested in "beta" testing new engines.
I have a Toni Clark Sopwith Pup to build so a 60cc multi-cylinder that is capable of swinging a large diameter prop would be of interest. Shorter term I have a airframes that could be used for testing new design engines.
|Thread: Silencer Gaskets|
Yes - I use Nord-lock washers on petrol engine manifolds - they remain secure.
|Thread: Does anyone remember...|
I used to cycle to the Longmoor flying site in Sutton Park as a child in the late 60s to watch the flying. I remember Dennis Thumpston flying his Twin Fin design - powered by a diesel engine.
In those days there were a few Super 60s being flown using RCS Guidance SC radio. I also remember seeing a Pete Russell Striker.
Martin, what were you flying around 1969?
When I started aeromodelling in the late 60s as a boy the local model/toy shop was Gills in Sutton Coldfield, Warwickshire (West Midlands now). I bought my first engine from there, a Cox Babe Bee - I still have it.
|Thread: Flair Spectrum Paint|
I have an almost complete Flair Tiger Moth that has been painted in Flair Spectrum paint.
I wish to re-paint parts of it. Spectrum is not fully fuel proof so would prefer to use an alternative paint that is. The Spectrum silver also appears to be a bit of nightmare to get a uniform finish.
My question is: what paints will be ok and will not cause a reaction with the Spectrum paint underneath?
All advice gratefully received.
|Thread: Ben Buckle Majestic Major help|
The OP was by David H not me!
I only interjected to ask whether people with MMs built in the 2 degree down thrust as depicted on the plan. The MM I acquired did not have it and IMHO it needs it irrespective of the engine size.
I installed a Laser 70 because I have one (in fact two) and they easy to operate and "purr", but not to be used at 'full-chat'. My experience is that Laser engines are fine running all day at reduced throttle settings.
I have a Rohma (similar to Junior 60 - similar vintage) originally powered by a ED 3.46 Hunter (currently an OS 30 FS) and the power on/off trim is fine.
I appreciate the fact that the MM is basically an enlarged vintage free-flight model.
Nevertheless from a modest power setting from engine on to engine off it should remain vaguely in trim, but my MM doesn't hence the need for downthrust so it glides ok when power off .
Edited By Robert Welford on 24/06/2020 23:33:21
Yes Paul, I agree it's a guided freeflight model and not an F3A model. However, it would nicer to fly if there was less pitch throttle coupling. Hopefully, the addition of 2 degrees down thrust will improve things.
I have a Belair Super 96 (slightly bigger MM) to build, but it has yet to reach the top of my build list.
However, during lockdown I acquired a S/H Majestic Major. The previous owner had a Saito 82 in it and installed the elevator servo in the tail.
I've re-engined it with a Laser 70 and installed my radio gear again with an elevator servo in the tail. Surprisingly the CofG is within the range indicated on the plan.
I flew it last week for the first time. It has no downthrust and minimal right thrust and I found that it has significant pitch changes with power and requires right rudder trim. I put in a some nose weight (~500g) and it made no difference. Once trimmed at low power setting it was fine.
It is well overpowered with the Laser 70.
I have now put in 2.0 degree so I hope the power/pitch coupling will be reduced. Out of interest how much down thrust and side thrust have other MM operators used?
|Thread: la.40 in an Acrowot artf?|
I have an ARTF Acro Wot with a Laser 80. However, I would recommend using an Irvine 53 or an OS 55 AX. Both are fantastic engines and are the same size as 46 engines. Available on ebay, or BMFA ads, for reasonable money.
Edited By Robert Welford on 18/06/2020 16:54:49
|Thread: Things that have dropped off in flight|
Things I've I had fall off airborne models:
Fortunately, in all cases the models were landed without damage.
|Thread: OS GF40 4-Stroke Petrol|
Please provide link - thank you.
I'm planning to use mine in a Toni Clark 1:3.85 Super Cub. The power should be adequate and sound better than a petrol 2-stroke.
Edited By Robert Welford on 07/06/2020 19:37:39
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