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Member postings for stu knowles

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

Thread: Help Me Land My Triplane !
08/03/2011 06:31:27
Thats funny, mine is laid up with broken spars too! The fully sheeted centre section / sudden change to open outer wing section is an abrupt change in strength / flexibility, probably not a good design point. Trouble is that if one spar breaks, chances are that all three break.
One day I would like to try the larger version. Does it handle any better??
stu k
07/03/2011 20:54:50
I seem to remember that mine performed better if the moment the mainwheels touched the ground, I released the elevator and let it slow down with the tail high. After it has slowed a little, then pull the tail down with up elevator. Sounds counter intuitive but it worked.
Still had to be smack into wind though.
stu k
Thread: Club Rules
14/02/2011 18:54:15
Andy and Ralph have it right, Working toward an A or B should be a fun and pleasurable thing done for the sake of self improvement. IMHO its a pity if it gets mixed up into some sort of safe flying campaign where people are coerced into it. Particularly for the pilot who is not interested in show / display flying and is just doing his own thing in his own club.
stu k
13/02/2011 20:01:54

I don't have a problem with a B / LMA cert of competence being required for show and event pilots, however for general 'in club' flying, personally I think that forcing the possession of A & B certificates is unnecessary.
The scheme was not designed for this purpose and possession of same is no guarantee of good flying.
I don't think that it absolves a club from properly policing its members if it becomes necessary and if it doesn't become necessary - because flying is safe- why compel someone to take the test
stu k
12/02/2011 17:55:22
I almost hestitate to add anything more to this thread, the topic has been well aired many times. However ........
The BMFA do not promote the Achievement scheme as anything else but just that, a personal Achievement Scheme for individual pilots. I personally don't think for one moment that if a guy flew like a nerd, a club or committee who be able to avoid any liability that there may (or may not be) by saying we insist on a minimum A or B. If there have been poor flying standards they must be addressed for what they are.
If a person opts to fly in the company of others, then for the good health and well being of all there must be rules. I strongly support that but also say with equal conviction, only the minimum of carefully targeted rules are desirable.
The club must enforce some standards and discipline but for me, compulsion to do an A or B is slightly off target
12/02/2011 10:33:29
I would make two comments.
One, Take the B test. It is easy and once gained the issue doesn't arise anymore.You will feel a sense of achievement I guarantee it, no matter how long you have been flying.
Two. The B test has nothing whatsoever to do with safe flying. People to have a B can and do fly like a hooligan. The B shows that they can fly reasonably well if they choose to. Some however choose not to.
The rule that your club should impose is that ALL models will be flown with due regard for the safety of others. Adopt the rule and enforce it by a verbal warning, a written warning should there be a repeat example of rank bad flying, followed by an invitation to close the gate on their way out if there were to be a third incident. There should always be a right of appeal to the Club Committee. Better if warnings were not given out on the say so of one person only.
The disciplinary system shouldn't penalise and out of character mistake, a one off incident, but should drop on persistent offenders who just don't get safe flying.
Thats it. One size fits all from first model to giant and takes in everything in between.
2p supplied for what its worth.
stu k
ps Take the test this year
pps, Just to show that its about piloting skill, not buying some aerobat to make it easy, take it with any old four channel hack, even a trainer type if you can find one that will spin and bunt. Success will be all the sweeter.
Thread: Walbro Carb Needed??
12/02/2011 10:10:48
A word of caution. My experience is limited to a Zenoah 38 which had lost its carb.
I tried several, probably 5 or 6 walbro carbs which all look much the same, at least two were new and sold by 'aftermarket sellers' who assured that 'one size fits all'
None worked properly.
On the point of junking the engine as scrap, I was loaned another z 38 with original carb. I swapped that one over and the engine ran, and still runs beautifully (after spending something like £70 on a spare carb from Toni Clarke) . Money well spent. All before - wasted.
As I say, its a limited experience but it showed me that Walbro carbs, an other makes look the same , but are not. It may be worth spending some time tracking down what the original carb was, then finding one of those. There is a lot of info out there which lists dozens of different carbs.
Good Luck
stu k
Thread: Spraying Solarlac
29/01/2011 17:57:28
I haven't personally sprayed onto film but I know that 'Prymol' is a solarfilm product especially for preparing the surface of the film to accept paint. I have read good reports.
i would have thought that paint onto film without a suitable chemical etch would not work well.
stu k
28/01/2011 20:50:12
Primer is to produce a good surface for top coat and or an even colour underneath light colours, I wouldn't say that its essential for using solarlac.
I thin with cellulose thinners. If not thinned enough it tends to spray a bit like cotton wool.
I have used Solarlac quite a lot and found it fuel resistant and pretty good all round. I use clearcoat as a final waft over any stickers or weathering and all around the front of the fus
stu k

Edited By stu knowles on 28/01/2011 20:50:47

Thread: The finer points of two stroke tuning
24/01/2011 20:52:13
You have posed a question that will get you a different answer for every person you ask although you have also correctly identified probably the biggest model breaker in model flying, engine cuts!
This is my way and (touch wood) I rarely suffer from this problem.
Tune for high speed. leave it no more than a couple of click on the rich side of perfect.
Tune the low speed,Read up how to do airbleed and two needle carbs. Get the right setting by pinching shut the fuel feed just before the carb while the engine is ticking over.
If the rpm rises a lot, its too rich. if they die with no rise, too lean. small rise in rpm and then slowly dies.... just right (said Goldilocks)
If the engine still plays up, clean the carb and back flush with fuel. Use a good plug, My favourite is an Enya No 3.
Good quality engines repay the investment times over by not wrecking models.
Time invested in getting a good engine set up is rarely wasted. Good luck
stu k
Thread: Plane ground anchor / tail support.
03/01/2011 14:23:18
To speak for an alternative view, I shudder when I see models restrained by the comparatively fragile tailplane while being started, or even worse, run up to full throttle.  Not for me anyway.
I prefer to use the leading edge of the wing , most often using my flight box in front of one wing and a padded stick driven into the ground in front of the other.  On particularly tall models, two padded sticks.
I accept that this is a minority view but IMHO neither the construction of the tailplane and rear fuselage or the close proximity of all of the elevator and rudder linkages, make tail restraints a good idea.
You pays your money......
stu k 

Edited By stu knowles on 03/01/2011 14:24:54

Thread: Gloster Gladiator Models
08/12/2010 22:02:21

I have an example of the Phil Ramsey Gladiator, found at the Nats bring & buy a couple of years ago.  Its very nice, flying with a zenoah 20 which just about fits inside the cowl. My guess is that with a 'normal' glow motor, it would need an additional housebrick up front to balance.
Apart from a pretty rubbish canopy, it makes into a very nice model, just small enough to get into my car ready assembled. (very important)
I haven't seen any mention of PR kits for years.When they were being made, they were quite expensive.
Nice model photos in this thread. I have a pic of mine somewhere, I'll try to find it.
good luck with yours
stu k 
Thread: Pick a Plane 2011
19/11/2010 13:35:21
I would add my vote for the DH Dove airliner, undermodelled so far but my fave suggestion would be for a Leopard Moth (or any of the other high wing monoplane moths
beautiful aeroplanes and would make fine models.  Even a 60 powered version could be 100 " span.
stu k 
Thread: Seagull Sparrow Hawk 1.8m ARTF
02/11/2010 20:23:42
I think that the z20 will be more than big enough for this model. Regardless of the numbers, I would say that it way outperforms a 120 fourstoke and its clean, clean, CLEAN!!!!  No more dreadfull gunge all over the model after every flight.
The z 20 is a quite wide engine, the carb sticks out of one side and the silencer is on the opposite side. This is more likely to be a deciding factor .
stu k 
Thread: Chris Golds Lanc
12/09/2010 20:57:46
Hi there,
I built, ( and still have ) the CG Lanc quite a few years ago. It still has a few sorties every year. This year I flew it from the hallowed tarmac of Scampton airfield, which was rather nice.
I was sceptical about the CG foam and BP methods, but I do recommend that you stick to his methods.  I was amazed at how it shrinks and gives a stressed skin to the foam.  If the BP was swopped for tex type material, I fear that there would be a lot of give in the tex which would weaken the overall airframe and not look half so good.
I think the finish when done 'as per' is good. I finished mine with flair paint and it has lasted well.
Chris Golds  has always called this model 'cartoon scale' which describes it well. It looks like a Lancaster. It builds quick and cheap. It flies well and has outlasted its expected lifespan by several years.
Good Luck with yours
stu k 

Edited By stu knowles on 12/09/2010 20:59:36

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