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  1. Ramon

    Nalon Viper 2.5cc CI Engine

    Good luck with your new job Pat and good luck with your future projects - maybe see you at one of the Old Warden events one of these days. Been a pleasure to assist you - Tug
  2. Ramon

    Nalon Viper 2.5cc CI Engine

    Hi Tim, yes familiar with AMA stunt. Though lapsed now I was a PAMPA member for several years. My first Stunt News was a few pages just before Tom Morris turned it into the epic magazine it became. I no longer compete - last time was 2006 and am just getting back into C/L again after quite a...
  3. Ramon

    Nalon Viper 2.5cc CI Engine

    Never quite thought of it that way Tim but looks like I might be a 'courageous teacher' Ha Ha ! I've been doing it that way for years - young and old - but Pat's a fair distance away, I'll step in only if he can't find anyone locally which is what he really needs. Of course he could always...
  4. Ramon

    Nalon Viper 2.5cc CI Engine

    Yep, that's the technique but there's a little more to add which I feel is best left until right before that first attempt. Currently at the moment going through the moves with someone who last flew 50 years ago - so far so good ;) and just started inverted flying. Tug
  5. Ramon

    Nalon Viper 2.5cc CI Engine

    Well I hear your sentiment but if this is to be a first you really need someone to show you how to fly. Believe me it is not a matter of holding the handle and bending your wrist up to go up and down to go down. Everything from the point of launch will happen so fast you won't see it! If it...
  6. Ramon

    Nalon Viper 2.5cc CI Engine

    Hey Pat - you never said you were a control line flyer - been a passion with me for over sixty years. Building a largish stunt model right at the momenmt - 'Coy Lady' - ring any bells? If you want a similar looking but brilliant flyer get yourself a 'Frog' Talisman plan and get it scaled to 42"...
  7. Ramon

    Nalon Viper 2.5cc CI Engine

    Definitely don't do as you describe - the blades would probably shatter. You need to get your self a prop balancer or make a simple one - length of steel that fits the prop hub tightly. Cone each end of the steel to a sharp point about 60* inclusive Insert through prop with equal amount...
  8. Ramon

    Nalon Viper 2.5cc CI Engine

    APC props are very efficient in use - they are also extremely efficient slicing through flesh as quickly as a scalpel either as you percieve, running your finger down the edge as you flick a flooded engine or if you catch your fingers in the prop arc. Believe me you will not be the first...
  9. Ramon

    Nalon Viper 2.5cc CI Engine

    Hi Pat Nice run but I too had to look at the prop hard to see if it was back to front. I found it difficult to determine as it does look as if you have it that way. Turning the prop such does not turn it into a 'pusher' BTW :) Turning the prop around was a recommended way to reduce the thrust...
  10. Ramon

    Nalon Viper 2.5cc CI Engine

    Congratulations Pat - well done on acheiving a good runner 👍 Been pleased to help and answer all those questions. You've got what it takes now (or should have :)) so hope your future builds meet with similar success. Re cutter making heres the above cutter being made for the Eta engines...
  11. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat Boring out the crankcase to give a transfer passage as the original design is probably 'overkill' for what is actually needed. It will certainly lead to an excess increase in crankcase volume. As an alternative passages can be cut into the side of the case bore using an homemade cutter that...
  12. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat - You would be right but don't dismiss that info lightly. Have a look here Barton Model Flying Club :: View topic - Nylon Props - post 6 is from someone I have known for many years - a seasoned, very knowlegeable and highly experienced aeromodeller. The potential is there with these specific...
  13. Ramon

    Nalon Viper 2.5cc CI Engine

    'Morning Pat, The teeth only need enough clearance to achieve the depth of cut desired. Also bear in mind it's only the very tip of the teeth that define the cut dimensions so anything behind is potentially rubbing. This will be even more important with your single point cutter if you go that...
  14. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat - looking at your image of the cutter- 'draw a line' from the gullet of the tooth bottom left hand side to the gullet of the tooth above. I would think you need to remove the land out side of that line on each tooth (both sides) as I would guess that's possibly rubbing at depth. As said...
  15. Ramon

    Nalon Viper 2.5cc CI Engine

    Its not a D bit Pat merely a flat acute angle ground across the wire by holding the wire at such an angle on the side of a wheel - try not to get it too hot as you'll lose the temper. If you can't hold it long enough to get a flat area then clamp it to something that will prevent the wire...
  16. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat, Though either will do there is a distinct difference between 'Music wire' and 'Piano' wire not least that the music comes in imperial sizes and piano in SWG. Piano wire is much harder and springier than music. Most wire sold in model shops from the KS range is music wire and usually has a...
  17. Ramon

    Nalon Viper 2.5cc CI Engine

    Hi Pat True old saying you can learn something every day :rolleyes: The maths I was referring to was using the cutter to touch on and move to the correct position but.... Until my last post I'd never considered doing as suggested but given an accutrately scribed line relative to the exhaust...
  18. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat - I assume the '45 degree' is a typo on your part :oops: You need to establish by maths (CAD) the exact position of entry on the liner of the centreline of the cutter to give the cut off point at .024 below the exhaust as the cutter breaks through. I normally do this from a known edge - eg...
  19. Ramon

    Nalon Viper 2.5cc CI Engine

    Pat - last question first. Think of the boring bar as the diameter of the shank of your cutter and the protrusion of the tool bit as the radius of it. You have to have enough depth to give the depth of cut required without the shank (or boring bar) hitting or just touching the liner . Drilling...
  20. Ramon

    Nalon Viper 2.5cc CI Engine

    Hi 'Billitt', nIce one 👍 I'm a firm believer in many ways to skin a cat and your suggestion is certainly one of them. Flycutting on the side you could say :) Feed rate though, I imagine would have to be very fine Whilst it would undoubtably work however, I can't agree that it would be the...
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