Sam Wragg
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Everything posted by Sam Wragg
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A pattern prop (apc)is generally anything above an 8" pitch ie 10x9/10/11/12/13/14. Using this type of prop reduces the noise footprint of the model, which is crucial in F3a comps (pattern),and also for everyday use. N.... ie 13x13.5N. Signifies a narrow blade which puts less load on the engine allowing it to turn greater pitches with reduced down line braking effect. W.....ie 13x10W. Signifies a wide blade which increases the load on the engine with better braking effect. E.. Signifies a blade/prop specifically designed for Electric propulsion systems and is NOT designed for I. C use. As a matter of extreme safety do not use on an ic engine An ic prop is a lot heavier than an equivalent electric prop. If you was to measure the current drawn by an electric motor and compared like for like between the same size electric & & ic prop you will find the current draw will be significantly higher for the ic varient of prop Hope this helps Sam Edited By Sam Wragg on 24/03/2015 19:55:22
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Select the brake function on your esc and use your throttle trim to to activate on landing to stop the prop from freewheeling then you can blip the throttle on landing to get the prop to stop at around the 3.....9 position Sam
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Hi Martyn, Over the years I have read up & tried many methods of glassing and come to the conclusion that unless you use the Vac Bag technique you can guarantee one thing........ plenty of elbow grease will be required, some more than others. Nevertheless I have developed my own preferred method that seems to work but still not looking forward to undertaking with the only driving factors of that it strengthens the airframe and completely fuel proofs it. If there's enough interest i will give a step by step account on my method as I go along Sam
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All work and no pleasure is slowing thing down now but beginning to see the end of the build now, all that is required is to manufacture the Belly pan and form the Wing fairings. Belly Pan A simple task of cutting some 3/8 Balsa sides (Tack glued on) Note the 1/16 gap between the L.E/T.E of the Fuzz Top sheeting in place (Gorilla Glue) then carved and sanded to profile before removing the belly pan from the wing Completed Belly pan prior to covering Wing Fairing This was achieved by bonding 1/32 ply to the fuselage and Gorilla glue to fill any gaps using the wing to hold the ply in position then in-filled with 1/2" triangular carved to shape prior to gluing on using Cyano then filling using Model Lite filler Arrow "in the flesh" All that's now required is a bit of titivating before Epoxy Glassing the fuzz/Belly pan & Pro-Filming the Wing and Tail surfaces Sam
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Apc I believe are designed to be quiet Sam Edited By Sam Wragg on 17/03/2015 15:29:25
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Great to see Concept nearly there. Re OS61, Martyn I suspect you may have throttling problems due to the large throat area and a pump may be required due the lack of suction of fuel because of this fact, although I may be wrong. I have read that with this Engine modelers have had success in changing to front induction with an increase in power over the RF version . Nevertheless I would run the engine using 10% nitro and see how you go on as it shouldn't stop you from tuning the engine to the pipe (after a period of running in). Leave the pipe slightly long as the engine unloads in the air if you suffer poor throttling try a smaller choked Carb as idealy this will give you more torque and suction. Revs..... aim for the mid ten thousands as this keep the noise down and go for an Apc 12x9 minimum, I feel the 12x8 you intend to use will be too fine a pitch for your OS. The OS61 in my Magic was new at the start of last season and the pipe was set long, by the time we last flew at Montfort Bridge I noticed that the engine had come on song and suspect I may have to go up in pitch to a 12x10 to maximise the power. Welcome to the delights of tuning piped 2 stroke engines Sam
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It's glass bodied version, the kit is complete with nothing missing. I first bought this kit 1979 when I was an apprentice. It was fitted with a redshift 60 and managed to fly it just the once in the spring of 1980 simply because our flying field was just that? I put it away and got distracted by learning my trade and the oposite sex (and forgot about the hobby). 10 years later I got the bug again and discoverd that my Gnat had been thrown away by my Dad. I never thought I would aquire that model again up until last week when I managed to secure a kit. Now a very happy man & will probably electrify and fit retracts just to keep the lines of the model May do a building blog when I get some projects out of the way first Sam
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Just aquired an unbuilt kit of the Gnat. Sam
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Paul great tip, Dave thanks for the link i will no doubt use for future planed builds. I decided to rout a 5/8 deep recess to overcome the issue the tank fouling. 5/8 deep recess prior to lining with 1/16 Balsa Lined recess.... Note 1/16 ply cross brace web sunk in 1.1/2" back from the leading edge to support the Wing Dowel Problem solved. I can now glass the center section of Arrows wing Sam
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It really ticks me off when people go knocking the HSE. H&S is there for a reason .... Its to reduce the risk of accident, injury or fatalities! Simples.......... ....The problem is its the jobs-worths of this country who hide behind the mask of H&S for whatever reason. (mainly because its easier to do so without citing any particular reason). All you have to ask is What hazards have been identified? What control measures have been put in place? Where's the risk assessment? Generally these jobs-worths have come out out University indoctrinated and devoid of any common sense simply because they've acquired no real life experience. DON'T BLAME THE HSE. BLAME THOSE WHO APPLY IT Sam
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As above......No I don't think I'm bing cynical After many years of dealing with the modeling fraternity at some stage each point I raise will happen leading to the demise of a good idea Sam Edited By Sam Wragg on 05/03/2015 14:17:53
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Posted by Sam Wragg on 24/02/2015 20:50:36: Posted by Sam Wragg on 24/02/2015 15:39:33: I can see the merits of a national model center but I can't see it working due to these factors 1 Fun police / jobsworths 2. Inconsiderate modellers who think they can do what they please. 3 impracticable for most people to go there and fly 4 it will only end up benefiting the chosen few. Am I being too cynical Sam
