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Type: Posts; User: mmattockx

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  1. Replies
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    RE: How to Quiet a 50cc Gasser? Help!

    You need to reduce prop speed with more pitch or more blades, not diameter. It is tip speed that makes the noise and a bigger diameter prop at lower rpm will still be noisy. Try a 20x12 or a 3 blade...
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    RE: Classic Pattern and the economy

    Thanks, David. I hadn't thought of buying everything from scratch to buid the plane, since there is always a bin of servos, old gear and accessories available after flying for a few years. If you buy...
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    RE: Classic Pattern and the economy

    Gary,

    What did you put in it to get up there? I'm not being a smart *****, I really would like to know.

    Mark
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    RE: Cutting parts through plywood?

    +1. A scroll saw is a great choice, with a small band saw second in my books. Use a fine tooth blade to minimize splintering and rough edges. If you really want to go first class, cut them slightly...
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    RE: I need some canister education

    Try lengthening the header a bit, maybe an inch and see if that helps. As the canister heats up, it will resonate at a higher frequency. I bet this shift is enough to make your engine act like the...
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    RE: Manufacturers cost?

    I for one hope that DA are making a decent profit. Even "excessive" profit. They are in business to make money, it is not a charity. The people who are complaining of gouging have never ran a...
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    RE: What Carb??

    Good advice. I will check the schematics to be sure the models I am looking at have two needles.

    Edit - I am looking at a WT-416 model that has two needles and a 13.5mm venturi. It also looks to...
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    RE: What Carb??

    Awesome! Thanks for the help, av8tor.

    Mark
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    RE: What Carb??

    Great info, Ralph.

    I have a question on these numbers, though. Shopping through fleabay gives me similar numbers, but not quite the same. Is there another list or a more comprehensive one? I see...
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    RE: Wanted - 46cc Poulan or 50cc Echo

    Good point. I would have anyway, but I have also worked on auto and bike engines with heads / carbs / valve covers off. It only takes once dropping a small piece into a deep hole to never forget the...
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    RE: Wanted - 46cc Poulan or 50cc Echo

    Thanks, Av8tor. I will probably cut it off outside for the time being and keep the internal cut as a backup plan. I am going to use a small cutoff wheel and go slow, there is no way I will get it hot...
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    RE: Wanted - 46cc Poulan or 50cc Echo

    Got the Poulan 46cc short block in hand now. It sure is light without the extra bits, just over 35oz bare on my scale. I will now be ordering the conversion parts and an R/C Excel ignition from...
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    Early 90's MAN with Muffler Article?

    As the title says, I am looking for an early 90's Model Airplane News that had an article on constructing homebuilt mufflers. I think it was in 92 or 93 and I believe the issue had a German aircraft...
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    RE: Sheeting/gluing foam wings

    The foam wing Bible:

    http://www.mackrc.net/patternwings2/index.htm


    Mark
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    RE: Sig King Kobra Question?

    Are you sure about that? All the other AX models are lower rpm torque engines.

    Mark
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    RE: Sig King Kobra Question?

    A 3 blade prop is somewhat less efficient than a 2 blade, but efficiency is never very high on our list with the power loadings we run. You can overcome any efficiency losses by simply adding another...
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    RE: Plans for Rare bear or others

    Well, Strega is a 'Stang. You could simply get some P51 plans in the scale of your choice and then clip the wings and alter the turtledeck to match pictures. Google Strega and you will find lots of...
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    RE: Sig King Kobra Question?

    Good point. A 3 blade 12x8 will be about 80% of the load of an APC 14x6 and a 13x8 3 blade will be about 109% of the load. There are lots of ways to skin this cat without the 14" prop to contend...
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    RE: Sig King Kobra Question?

    Well, I used to fly a CG Ultimate bipe with a ST90 and APC 13x8 prop. I doubt a 75AX is going to turn more prop than that ST90 did. Prop load is also dependent on pitch, don't assume all props are...
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    RE: Wanted - 46cc Poulan or 50cc Echo

    Gentlemen,

    I have bought a 46cc Poulan short block to be used for my project, just waiting for shipping now. I will update with any progress and results as I go. Thanks for the help and...
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    RE: Sig King Kobra Question?

    I think you will find the KK much more enjoyable with a higher pitched 13" or even 12" prop. It is not a 3D model and likes to fly fairly fast, not hang on the prop. Try an APC 12x8, 9, 10 and the...
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    RE: Calling all Aerodynamicists !

    This would be my choice. Dihedral is an angle, not a linear dimension. They specify it as a distance under the wingtip, just because it is the easiest way to measure it. To be truly accurate, use the...
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    RE: RCGF Engines

    The electric pattern guys carry generators for this reason. Cheap flying, huh?

    Mark
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    RE: Wanted - 46cc Poulan or 50cc Echo

    Gentlemen,

    I have a lead on a Poulan 46cc short block. Price is very good (IMO), the engine is bare with no ignition or carb. Looking at Brillelli's site, they offer a prop adapter for $30, a...
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    RE: Wanted - 46cc Poulan or 50cc Echo

    That was mentioned to me in another thread. I haven't been in that end of Calgary for over a month, so I have not had a chance to take a look yet. Thanks for the reminder.

    Mark
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