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Member postings for Peter Christy

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

Thread: Thinking aloud about Spits...
14/09/2019 08:58:01

PatMc: I don't think anyone is suggesting raising the ailerons as a substitute for built in wash-out. However, presented with a finished wing that exhibits tip-stalling, the options are either 1) build another wing or 2) find an alternative solution.

One alternative is raising both ailerons slightly (doesn't work with strip ailerons, though!). This is simple, and often surprisingly effective.

Aerodynamics - like my own speciality, electronics - can be something of a black art, especially at model sizes.

Sometimes effective solutions are weirdly counter-intuitive. And at the end of the day, even if it doesn't work on a specific model, you are no worse off for trying it!




Thread: Latest CAA Update
13/09/2019 18:08:56

There is no evidence of the *original* drone sighting, that caused all the panic, and the Chief Super quoted above was hastily silenced!


Because there were subsequently several confirmed drone sightings that caused even more confusion and chaos. Unfortunately, the drones in question belonged to the police and were sent up to try and apprehend the original (non-existent) drone.

There is now an embarrassed silence from the police on this front!



Thread: Jabberwock RTS (ready To Skip)
12/09/2019 14:29:45

Posted by Bob Cotsford on 10/08/2015 13:38:13:

It's one of those switches with a built-in charge socket and a sliding cover, one I had in stock when I built the model earlier this year but I don't recall whether it was branded or not.

Bob, those switches are notorious, regardless of manufacture. I was warned of them years (decades?) ago. The only one I have is used for bench tests - nothing else.

Sorry to hear of your loss, but my money is firmly on that switch!

Ooops! Just noticed the date of the original post! Still, better late than never!




Edited By Peter Christy on 12/09/2019 14:30:34

Thread: Thinking aloud about Spits...
12/09/2019 11:36:20

Martin: The model in that video looked tip-stally right from take-off, and would probably have benefited from having each aileron raised a turn or so to provide some washout.

Whilst I get far more enjoyment out of flying models I have built myself, I have found that some foamies do offer excellent value for money! My last two traditional builds (Kingpin and Jackdaw) cost an arm and a leg in balsa!

My current Spit is a Durafly Mk1a **LINK** which not only looks a million dollars in the air, but flies beautifully too! Bearing in mind that it comes with all the servos, retracts, motor and esc - well, I couldn't buy the components for less than the cost of the finished model!

The flying characteristics are extremely benign. However, the flaps act more like airbrakes than lift enhancing devices - very useful for shedding speed on approach - but if using full flap, it definitely pays to keep some power on until just a fraction before touchdown, to retain positive control. Without that bit of power it is too tempting to over-slow it!



Thread: Latest CAA Update
12/09/2019 08:50:55
Posted by Peter Jenkins on 12/09/2019 00:35:21:

I always thought that the pseudonym of Failing Grayling was unfair. I'm not so sure now! Well done to Grant Shapps for taking this up and directing the DfT to be helpful towards the model flying world. Let's hope they do as they are told and don't have a Sir Humphrey to frustrate the S of S's direction.

Oh, Grayling's reputation was well earned! From privatising the probation service (many of the "suppliers" have now gone bust!), Brexit Ferries (giving a shipping contract to a company with neither ships nor experience), the list is endless! In each case, his successor has had to sort out the mess he left behind!

When I learned who the new SofS for Transport was, I was hopeful, as he has shown himself to be a friend of model flying in the past.

I just hope the progress being made is not disrupted by all the other current political shenanigans!



11/09/2019 22:14:04

Excellent news!

Well done all those who have worked so hard for this, both within the BMFA, and those who have pestered the DfT, CAA and their MPs.



Thread: All weather flyer.
11/09/2019 15:15:30

Shoulder-wing, for easy hand-launching from a muddy field, moderately stable to assist landing in turbulence, not too light, so it doesn't get bounced around too much and small enough to get in the back of the car quickly when the heavens open up!

A Tauri (or similar) springs to mind!


Super Tauri



Thread: Analog versus Digital servos
10/09/2019 19:45:18

I would be very wary of letting anyone who displayed such a poor grasp of RC systems anywhere near my radios!

"Analog" servos (poor terminology, but it will have to do) will only work with low-frame rate radios. ALL 35 MHz radios are low frame-rate. The 10KHz channel spacing doesn't allow enough bandwidth for high frame rate.

"Digital" servos (again, poor terminology) will work with both low and high frame rate systems. Only spread spectrum radios are capable of high frame rate, and most default to low frame rate to avoid damaging analog servos inadvertently connected.

The only time you will find high frame rate on a 35 MHz radio is in the output of a high-end gyro - usually only employed on helicopters.

In other words, "digital" servos (except very expensive tail-rotor servos) will work happily with high or low frame rates. "Analog" will only work with low frame rates, and can be damaged if connected to a high frame rate radio.

Find yourself a proper service engineer! Mike Ridley springs to mind!



Thread: Taurus - Model Aeroplane News
09/09/2019 13:51:01

I believe I do remember it, Brian! When I first moved from Devon to the Watford area, around 1974, I had a Taurus clone. It was called a Tornado and had been produced by a Devon kit maker, but was really a Taurus with a foam wing!

I modified mine to conventional ailerons (never liked strip ailerons!) which was very easy with foam wings. And it was powered by that same Webra as is now in the KingPin!

I eventually retired it when I replaced it with a Gangster 63 (also powered by that same Webra!), and John Sharman bought it off me. I've no idea what happened to it after that....



09/09/2019 11:28:55
Posted by kc on 09/09/2019 10:44:07:

Would it be considered sacrilege, in such a classic design, to suggest changing the LE construction to one using a false LE with separate upper and lower wing skins lapped over it with a front capping piece? To me that would be easier than trying to bend balsa right around the LE.

Not by me, it wouldn't! wink

The "KingPin" appears to be Dave Platt's variation of a "Taurus" (many of the designs of that era were Taurus clones!) and uses the construction you suggest - plus a fully sheeted wing.

Looks like a Taurus and flies like a Taurus! The only difficulty I found was in accurately joining the two wings without the benefit of dihedral braces / doublers.

09/09/2019 08:36:58

Posted by Michael Denest on 09/09/2019 01:16:19:

The Veco .45 can be a bear to run in (there's no ring). The best thing to do is to use a fuel with extra castor oil. These older engines were not designed to use synthetic oils but mixing castor in will work ok.

I have to disagree! Castor fuel belongs in a museum, not an engine! I'm running quite a few 60s era engines (including OS MAX 40H, pre-Blackhead Webra 61, and several HB25s - same internally as the Vecos of that era) and all run perfectly happily on a good synthetic oil.

I bought the Webra in 1968, and it is still hauling a Dave Platt Kingpin (very similar to a Taurus) around in grand style today. The only recommendation I would make is to use a good quality helicopter fuel (I use Model Technics Bekra fuel) as this is intended for applications where cooling is restricted.

Although cooling is not restricted in a Taurus, these old engines can run a bit hotter than modern ones!

Also, most old engines use long reach plugs. Although they will run on short reach plugs, it does remove the element from where it really needs to be, and reduces the compression slightly. 4-stroke plugs are generally long reach types, and work really well in older engines.

BTW, one trick to forming the "wrap-around" leading edge on a Taurus is to wet ONE side of the LE sheet with water. This will make the wood curl up, and make it much easier to glue in place without splitting the sheeting!

Nice project BTW! My Kingpin turned out about 2lbs lighter than the design weight, not because I'm a light builder (I'm not!), but because modern radio gear is MUCH lighter than that for which the model was designed!



Thread: Commons Science and Technology Committee Enquiry on Drones
08/09/2019 09:49:16

Quite right, Chris. If we left EASA, it would be the end of international flights to and from Europe - if not elsewhere - until alternative arrangements could be worked out.

Hence my earlier comments about remaining in EASA regardless of Brexit!



Thread: Thinking aloud about Spits...
07/09/2019 16:21:56

My limited experience of model Spits (had it about 18 months) is that the well designed ones are no more difficult to fly than any low-winger. The tricky bit is the landing!

A combination of narrow track undercarriage, small (scale) wheels, and wheels close to the CofG makes them prone to nosing over on landing. Take-offs usually aren't a problem, as we tend to over-power our models!

If you have a nice smooth runway (short grass or solid), a Spit shouldn't be a problem. Beware of trying to slow it too much on the approach, and if using full flaps, keep a bit of power on until just about to touch down.

Otherwise they are generally very nice to fly.



Thread: OS 40 four stroke, inverted?...
07/09/2019 08:59:18

I ran an OS20FS inverted for years in an "Attila". At first I had a few issues due to the tank being positioned as shown on the plan, which was too high. Once I moved it down to the floor of the fuselage, it ran beautifully.

I never had a problem with flooding, but I was always careful to turn it over by hand a few times before applying a starter!

Still got the engine, and an untouched kit in the garage, awaiting their turn on the building board!



Thread: Check and tighten those prop bolts!
06/09/2019 18:26:35

Don't feel to bad about it! It happened to someone I knew in a full-size motor-glider! A loud bang and the prop went AWOL!

Luckily, he managed to glide back to the airfield, but it was some time before the prop was located - in an apple tree of a little old lady in a country village!




Thread: Latest CAA Update
06/09/2019 17:11:35
Posted by Steve J on 06/09/2019 16:17:31:
Posted by Peter Christy on 06/09/2019 16:12:38:

Neither the CAA nor the DfT have come out and branded such a scheme illegal, as far as I'm aware, limiting themselves to saying the it would not be "appropriate".

CAA submission to Commons enquiry.


And you could make exactly the same arguments about BBC and ITN cameramen (to pick a couple of examples), as they will no doubt have more than one drone and be personally responsible for its maintenance.

Indeed, I doubt if ANY commercial operation currently expects anyone other than the pilots to determine "when, where, and by whom the drones are flown". Just as with any commercial aircraft, the pilot can refuse to fly if he doesn't believe the flight can be conducted safely, so he, and not the "operator", is determining "when, where, etc..."

Sorry, doesn't hold water.



06/09/2019 16:12:38

I still stand by my original thesis that the law cannot allow one association - be it the BBC, Amazon or whoever - to act as the "operator" for one group of pilots, but not another association, be it the BMFA or a club.

The big difference is in the operator liability should anything go wrong. Public companies will have liability insurance, and limited liability for their directors - that's what a limited company is. However, some model clubs are already limited companies - they had to be to get a mortgage to purchase their own land - and should therefore have no problem registering as the "operator".

And as I've already pointed out, the current rage for LLPs (Limited Liability Partnerships) - which seem to be primarily money laundering operations - mean that such companies can be bought "off the shelf", and should provide the protection needed.

Neither the CAA nor the DfT have come out and branded such a scheme illegal, as far as I'm aware, limiting themselves to saying the it would not be "appropriate".

That tells me that they recognise a loophole when they see one!



Thread: One for the single channel fans
06/09/2019 08:54:11

Tom: Nah! You'd never have got all the valves and HT batteries in a box that size! wink

Doug: Glad to hear its still in use and being enjoyed (as is mine)! laugh



05/09/2019 17:30:49

Funnily enough, I built 35 MHz one of those for a chap a couple of years back!

And for those of you who don't know what single channel meant, here's a primer!

Thread: Latest CAA Update
04/09/2019 10:48:10

This just confirms what I've been saying all along - the CAA are NOT the problem, the DfT is! Fortunately, we now have a Secretary of State who may be on side, though I suspect he has other matters on his mind at the moment! And whether he (and the Baroness for that matter) will still have their jobs by the time the regulations are due to be implemented is anybody's guess!



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