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David Davis

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Everything posted by David Davis

  1. It's just been announced that the competition will now take place on 14th September. The 7th is the Journée Des Associations and several of the entrants are committed to that.
  2. I built my first model aircraft, a Keil Kraft Ajax when I was eleven. It was my first and last rubber-powered model, I could not stop the nose block from falling out! I took up radio control in 1988 at the age of forty. I am now seventy-six! Attached a few pictures of my forty-something self.
  3. The Laser 180 was a glow engine. I'm not sure whether a petrol version was ever made.
  4. I have already fitted an OS 40 Surpass to the Guidato. The OS flies it well enough but the Junior 60 is a more pleasant model to fly.The Guidato is over-engineered, a bit heavy and consequently rather fast. All of which probably explains why I've never seen another Guidato in over thirty years of flying r/c models!
  5. I have an ASP 30 FS as well. It won't pull the skin off the proverbial rice pudding! I put it in my 4lb 4oz (2kg) Guidato, This is a vintage model with a 66" (1.67) wingspan. Am I expecting too much from it?
  6. I anticipate a couple of pension payments between now and 11th July. If I have no unexpected bills between then and now, I'll buy the kit.
  7. I use a piece of electrical connector block. Cut off the plastic insullation if necessary, screw one side to the glow plug and the other to the live feed. Examples of my Laser 50 and 75 below.
  8. Hello Charlotte and welcome to the forum. Are the two wing halves securely glued together? The engine looks like an Irvine 40 or 46. These are very good engines and run well on ready made fuel containing 5% nitromethane. Please look into joining a club, most aeromodellers are keen to help beginners. You may find clubs near to your home here: https://bmfa.justgo.com/clubFinder.html
  9. Well either I have been very lucky with my Lasers or you have been very unlucky with yours Paul, but to answer Mark's question I have seen a 1/4 scale Flair Tiger Moth fly perfectly adequately on a Laser 150. P.S. I also own four stroke engines made by OS, Magnum, ASP, and Thunder Tiger. I have never had a valve spring fail on any one of those either. As for the two HP VTs I own, they do not have any valve springs!
  10. I own ten Lasers from a 50 to a 160V and I have never broke a valve spring with any of them.
  11. This was my very first r/c engine! I was given it by some kid who couldn't get it to run. I fitted in something called a Gemini designed by Jim Baguley. It was far too fast for me and being a total novice and I soon crashed it so I gave the airframe to another club member who also had a Gemini. I had John D Haytree, (remember him?) install an aircraft crankshaft in the engine which reduced the chances of getting a manicure every time you tuned the engine! I then built a Junior 60 and installed the Irvine in it. I learned to fly with that model. I raffled off the engine in a new model for charity and years later I built another Gemini, electric powered this time, just to prove that I could now fly it. I gave it to a clubmate. Pictures of my second Gemini below.
  12. When I retired to central France I bought a lot of fuel from Southern Model Craft including five gallons of straight fuel, i.e, fuel which contained no nitro, because this was the recommended fuel for old Lasers at the time. It was a very pleasant day yesterday with sunshine and light winds so I took my vintage Big Guff powered by a Laser 62 to the flying field. I wanted to see how well it would run on straight fuel. It fired up straight away, I adjusted the main needle for best performance but did not adjust the bottom end because the needle is rather inaccessible in my installation. Low speed running was rather uneven but impatient to get the model into the air, I took off. It flew well enough but on the landing approach I needed a burst of power so I pushed the stick forward. The engine responded then cut. In the subsequent arrival I broke the propeller but as I only live a few kilometres from the field I went home and took another propeller from my collection. This turned out to be a 16x4 as opposed to the 14x4 which I had been using. I drained the fuel tank and filled it with 5% nitro fuel. Again I adjusted the main needle and engine ran perfectly. I enjoyed two more flights. Guess I'll buy some 10% fuel and mix it with the straight. As the weather was so fine there was a good turn out. There were at least four good builders there but with one exception, they had all left their own creations at home and they were flying electric powered foamies. The exception was Francois' newly built Baron which crashed on the maiden take off bending the undercarriage. Mine was the only i/c powered model there. A sign of the times I suppose.
  13. I don't think so Phil, mine had the tail glued on for a start and my electric motor was housed within the nose not stuck out like a beak! That said, I did sell the model soon after the photograph was taken so you never know. I chose the colour scheme to reflect that of my Uncle Geoff's Tomboy. Geoff was the man who taught me how to build. He was a draughtsman by trade and he had drawn up his own plan of the Tomboy double size but he died of cancer before he could finish it. Years later I finished and flew it. Picture of it and my much younger self below. Again sorry for the tangent.
  14. If I build the Junior 60 and if I cover it in film I would like to add tissue to the top of the film in order to give the model a traditional appearence. I have a couole of little four strokes which should fly it well but I feel that I would need to fuel proof the tissue. In the past I've used polyurethane exterior varnish over Solartex which, while not being perfect is good enough for me. My models usually look pretty second hand after the first few arrivals! On the other hand, I have good stocks of Solartex so if I build the model I may just cover it in that like the others I've built or helped to build.
  15. If I were to build a Junior 60, which was my first successful r/c aircraft, and if I were to cover it in doculam and tissue using either dope or WBPV as the adhesive, what would you recommend I use to protect the finish against glow fuel?
  16. I'm surprised that you got no bids for the Mills 75, it's a classic! However, they were made in such great numbers that I suspect that anyone who wants a Mills already has one.
  17. I've just received an email from the organisers of la Coupe Des Barons telling me that I am Pilot no. 7 in Group 7. Isn't 7 supposed to be a lucky number?
  18. Thank you for your replies gentlemen, using Nick Cripps' formula we arrive at the following: The OS weight is 403 grammes x distance from the centre of the engine from the balance point 21 cms = 8463. Divided by the weight of the Laser 620 grammes gives us a length of 13.65 cms from the balance point to the centre of the engine. Call that 14 cms or about 5.5 inches. So the nose length needs to be reduced by 7 cms or 2.75 inches which means that the firewall will be up against the leading edge of the wing. How bizarre is that!
  19. Every year I compete in a competition featuring the French "Baron 1914" trainer, La Coupe Des Barons. For the last four years my Baron has always been powered by a four-stroke engine. I have recently bought a Laser 50 and I thought that, as the sole Englishman in the competition, it would be good to fly a Baron with RAF roundels and a British four stroke engine. As this year's competition takes place a week on Saturday, it's too late to fit the engine to my model so I intend to build a new Baron for 2025, However, the Laser weighs at least 100 grammes more than an OS 52 Surpass so I'm thinking of shortening the nose to keep the cg in the recommended position. I realise that I could compensate for the extra weight of the engine by fitting the rudder and elevator servos in the rear fuselage but I still think that I will have to reduce the nose length to compensate for the increased weight of the engine. On a standard Baron, the distance from the wing leading edge to the firewall is 7 cms or 2.75". The distance from the firewall to the prop driver is 11 cms, therefore the distance from the wing's leading edge to the prop driver is 18 cms or about 7". If I were to remove the 7 cms between the wing's leading edge and the firewall and mount the Laser to a firewall which abuts the leading edge of the wing, assuming that the cg remains in the recommended position, what effect would it have on the model's flying characteristics? In other words, if the nose of the Baron was only 11 cms or 4.25" instead of the 18 cms (7") of the standard Baron, how would it fly? The opinions of the cognoscenti are, as always keenly sought. 🙂 Picture of my two Barons below to show everybody what I'm talking about.
  20. PS. There were even Be2fs and Be2gs as well but we wont go there! 😏
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