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Member postings for John Bisset

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

Thread: Model Flying on Mars!
29/07/2020 10:41:58

That is a fascinating and most intriguing video, Cuban8, thank you. Definitely a link I shall forward to my kids & grandkids. Like you, I didn't think that rotor speed excessive - it's similar to the max RPM on my fullsize motor glider at take-off. Noise sounds similar too.

The difficulty of flying manually is less surprising . Even if the system was able to allow for the gyroscopic lag, the skittishness of a light beast like that would be hard to deal with!

That so much power is used just keeping things warm I had not thought about - and interesting that CO2 alone provides enough thermal insulation.

I would not be at all surprised if some of the team are modellers, in fact I'd be surprised if there aren't modellers amongst them looking at the craft arrangement. (And just imagine the offcuts & discards potential !) Superb engineering to very tight limits I shall be crossing fingers for a successful launch and transit to Mars.

I was also much impressed by the way they spoke of the mission - the flights were 'we are going to take-off' etc.  Hearst & souls in the task. And what a multi national team... 

 

Edited By John Bisset on 29/07/2020 10:48:05

Thread: Fly aways
17/07/2020 22:57:37

And of course on older systems, remember to extend the transmitter aerial.

Something I forgot tonight. Brief and spectacular aerobatics. My Wot4 now needs a rebuilt fuselage. Bah humbug. (That wing is impressively tough though. Still reasonably intact after twenty years and on its third fuselage! )

Pre-flight checks not quite complete = null points. Doesn't matter how many years I've been doing this flying game, it is still depressingly easy to make a pig's ear of it. The only bright spot is that at least I did that with a model, not the full size. A cheap lesson and mental rap over the knuckles.

Edited By John Bisset on 17/07/2020 22:59:02

Thread: Forum weekend prize draw - winners!
10/07/2020 20:49:57

I wonder if posting a post magnifies your chances, or does the draw from the box roll on regardless? OK - a rubbish effort, even by my low standards.

Yes please, count me in.

John B

Thread: ST Salto - Approach & Landing
10/07/2020 12:47:16

Than ks John Lee, that is what I thought. The power pod does add a wee bit of drag - must look more deeply into my (Spektrum DX6) radio to set up a control for pop up, no power.

Thank you Dennis, very kind & useful. That is not far from what I normally aim for. With varying success, no crashes so far, touch wood. 

I have to say that losing height in the turn when starting at 'just above eye height' only works readily for me if conditions are benign. Rather fraught otherwise. My normal flying site tends to have turbulence off trees and hangars, to add excitement. My personal preference is for a glide approach, hence some means of increasing drag would be handy. I admit that does come also from full size habit - I have never liked dragging in under power. (I also tend to default to the continuous curving turn to finals, again from full size practice. That picture sits well in ,y mind)

Also laziness, - good airbrakes or draggy flaps make landings easier and more fun. I do like to slow landings for a proper flare. Long flat low drag stuff doesn't look neat to me!

 

Not relevant to the Salto of course, but is 'crow braking' the use of both aileron and flaps simultaneously - ailerons both up and flaps down? I am intrigued at suggestions of the both ailerons up option for other sailplanes- presumably that needs some loads trimmed out at the tail ?

Edited By John Bisset on 10/07/2020 12:47:36

Edited By John Bisset on 10/07/2020 12:48:31

09/07/2020 22:57:24

Hi all.

One of my 'bought not built' models is an ST Salto. A super wee flier that climbs well and aerobats nicely - or would if I was a better pilot.

Landings however are really long flat affairs. The machine is so low drag that I have to approach really low. Two questions -

Has anyone modified one of these to add more drag? I wondered about trailing edge airbrakes, if I could find space in the cockpit fpr another servo.

Is it worth trying to sideslip to add drag. I have never tried that in a model, though it works well in the fullsize - or at least in the Libelle which has fairly poor airbrakes and is quite similar to the Salto. I am not sure I can balance aileron with rudder well enough in a model.

Any thoughts?

John B

Thread: Precedent Stampe 1/4 Scale
08/07/2020 21:15:25

What Steve describes is how I recall the full size Stampe behaved too.

Serious crosswinds were 'challenging' = best avoided and even in light crosswinds sometimes accepting a gentle, slow, groundloop was the safe option when taxying. On hard surfaces sometimes that wee burst of power to get rudder authority could be a headache causing speed build up, and real Stampes mostly have light tail weight so using the brakes is best avoided. Lots of fun - thinking ahead mattered.

John B

Thread: Piper Twin Apache PA23 -150 74"
08/07/2020 18:01:05

It is based at Insch now, previously at Longside.

John B

08/07/2020 15:28:26

I shall ask the owner this evening by email.

I suspect the paints may well be to the old Piper standard, it certainly looked like that to me - shades that look very similar to the scheme on the Super Cub I used to fly.

G-APFV was G-MOLY at one time. John, the current owner returned her to the 'FV marks I believe because his uncle had owned her under those marks.

Cheers,

John B.

07/07/2020 11:15:39

This is fascinating stuff Danny, terrific. (I have only just found this thread, so am looking back through some intriguing pieces of work and interesting techniques. Wow!

The aircraft pictured as your header on this topic belongs to a friend of mine and is based nearby, so if you plan to use that colour scheme let me know. Photos could be arranged. I see you got a good source of Apache photos a while back.

Thread: Flair Puppeteer
30/06/2020 20:39:10

Thanks Geoff - an idea I may well use. That ease of replacement can be important.

 

Edited By John Bisset on 30/06/2020 20:39:24

30/06/2020 14:51:02

Thanks jd8 and Dave C - I have some fairly large size O-rings,but shall investigate that link. Likely to work better than my musings on joining some suitably sized tubing together - though carefully cut neoprene is a thought Dave.

Geoff s - that sounds like a lower drag option than mine!

Thread: What glues do you use?
30/06/2020 13:09:04

Interesting comments. I agree with kc - testing any new glue, or any old 'stock' that you may be in doubt over is well worthwhile. Still a requirement for full size glue work on aeroplanes, so why not here too, with a wee scrap piece?

Thread: Flair Puppeteer
30/06/2020 13:04:48

Good grief I can't believe it is three months since this was posted. I did get distracted by 'domestic issues' as part of this virus problem , but I hadn't realised it was that long. Sorry about the long delay!

Thank you for the video link barryt - I now have a part built fuselage which aims to have a similar system. I rather like the idea of an interchangeable 'power pod' for different machines, though I suspect the theory of that sounds better than the practice will be.

On your elevator cables question, I suspect this is far too late now, but have you thought of simply running the cables through small diameter cooper tubing acting as a sleeve into the fuselage, each side. The copper tube bent in a gentle S shape to bring the control wires into a position ~ parallel to lead to the servo? I did something like that in a smaller model years ago. It worked well, since the movement is not great and I saw little wear in a couple of years (light) flying. I used Laystrate control line wires and 1/16" copper tube as I recall. I had debated about putting the smallest size of heat shrink tubing over the wires at the fuselage entry as a wear reducer, but didn't bother in the end. Not sure if thta is of any help - I may have misunderstood your drawing.

Meantime the other problem I have been debating is wheels, though I have some time on that yet. Currently no commercial wheels of the correct size seem to be available in the UK, and I came back onto the forums just hours too late to spot the Williams Brothers wheels that were offered a day or two ago. Rats! I shall put out a 'wanted' add soon.

So - does anyone have any suggestions on building my own? I think I may manage to cast some tyres eventually - I have done some silicone rubber casting before and I suspect the softer rubbers used for that may be about right. Not sure though...

John B

Thread: new to wash out
26/06/2020 21:14:02

There were some full size machines where the washout was effectively provided by rigging the aileron appropriately.

I have a vague memory that there was some long span aircraft on which the aileron neutral positions could be adjusted in flight for optimum cruise efficiency.

Thread: Registration marks query
27/04/2020 21:55:22

Thanks all. I thought that was the 'number' required. It's just so darn long, to no purpose.

Edited By John Bisset on 27/04/2020 21:55:36

27/04/2020 12:50:28

This is a query which shows poor my memory is and how slowly things get done in remoter rural areas (or how little attention we pay to central 'authority'!) I'm sure some one her must have already covered this, but my searches didn't find those.

Having refurbished some models and completed a couple of half built projects, I was thinking about adding my CAA Operator number to them.

For the first time, I had a proper look at the email they sent me. Ignoring the obvious and unnecessary 'OP-' part, the reference is seven digits long, using both letters and numbers. Is that what we are supposed to put on our machines?

If my arithmetic is right, that reference allows between 4.6x1010 to 6.4x1010 unique numbers, depending on whether I & O are included or not. That is a huge number, given that the population of the UK is around 6.0x107 and around 2.0x104 at most of those fly radio control models. Why so large? (Why not use our BMFA numbers - they are shorter and easier to get right!)

So - is that the number I should use? Chances of anyone ever writing it down correctly, even if I don't spoonerise it, are slim! Shall take copy of the email with all the rest of the paperwork when I fly, just in case...

John B

Thread: First "Drone" deliveries next week
27/04/2020 11:15:30

I understand it is part of the UAV development work Steve, thanks. I simply feel it is an overly complex solution to a problem already easily solved. That of course will appeal to those 'in charge' many of whom seem to prefer complexity to simplicity. (Possibly explains why so many government projects fail, go over budget or don't perform the task adequately.)

I note that two safety pilots are required, with runways etc. As said by others, what benefit does this provide? A light aircraft can do this with lower probability of failure. Sending a drone for the mainland to the Isle of Wight is a relatively simple & easy task, especially if using airfields. If they view that as difficult enough to need a safety pilot at each end, what chance this can ever be of use elsewhere around the country at large? I'm not sure this provides much learning for later use.

I live in a remote part of this country, where quite frequently even full size aircraft fully equipped with identification systems are not tracked by any systems below 5 to 6000 feet. What chance of tracking drones? Delivery by drones will be very hit & miss for a very long time.. As it is deliveries by road, even using GPS mapping etc, still often go astray. Several time per month we are asked for help by deliverers.

I am not averse to the use of new technology; a large part of my career has involved bringing new technology into use and tweaking it to make it work. Often that meant we had to take a good hard look at what we thought we knew about the world, stuff we took for granted. "It ain't what you don't know that gets you into trouble. It's what you know for sure just ain't so." - Mark Twain.

I suspect that too many of those who are supporting this at high level have the faintest idea of the real challenges involved in making this work in a practical sense. Are they still being fascinated by the 'Ooh - shiny' bit ? Maybe I am being too sceptical.

27/04/2020 10:18:52

As Cuban8 says, a normal aircraft could do this more simply. As Barrie L says - a lot of money being spent, for little benefit

The Civil Air Patrol were being mentioned as one organisation which could do deliveries of urgent hospital equipment and medical samples at little cost. They are volunteers, are organised and ready., They have, I believe, already carried out one such urgent task.

This is playing to the gallery.

Thread: Flair Puppeteer
09/03/2020 16:22:21

Like you, barryt, I am dithering about the front end. Don Fry's hinged cowl area sounds interesting - I haven't heard of that before. Maybe a scrap trial build is needed!

Thread: Insanity seems to be setting in
09/03/2020 16:12:58

According to some psychologists people panic buy toilet roll because it comes in large packages and hence easily helps satisfy the urge to have a stock of stuff. Hmm !

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