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    Source for Carbon Rods?

    Interesting thing about Flat Rods (again From Steve Rahm the Vision Designer) he and his partner Scott found that very smooth and flat sided rods failed sooner than the Round Rods because, in his opinion, under vacuum the resin between Rods was squeezed-out and didn't maintain sufficient...
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    Plastic layers between foam ribs and carbon for removing foam for extra lightness

    Something told to me by Steve Rahm (Vision Designer), is that the Core of any laminate supports the Skin and helps the skin in sharing loads and stresses between the skins. This would be true of a Solid wing Foam Core, or Cored skins. Also the substrate helps support the skin or the skin relies...
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    Source for Carbon Rods?

    TLAR anything I've learned, I've learned from others. No names mentioned to protect the innocent. George
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    Source for Carbon Rods?

    patrickrio, 400 lbs. is very light is that the MTOW, or just the weight of the aircraft? Generally speaking it's the MTOW plus HT download less the wing weight multiplied by the G rating you wish to apply. That is the maximum load carried by the wing at the fuselage attachment points, half of...
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    Vortex generators on laminar flow airfoils

    It would be educational to know , the reasons for the differences of opinion. I'm sure both opinions are valid, but may vary due to design/ performance of different aircraft. Personally I don't know. George
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    My 13B engine configuration (tentative)

    dwalker- Ti, way to go for sure! George
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    Forum made EFI?

    Perhaps 'Preaching to the enlightened', if In-tank fuel pumps run dry they burn out. George
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    Source for Carbon Rods?

    Patrickrio, I agree with you, but given the cost and access to quality product, the "Roll-Your-Own" is looking more and more attractive. Stanislavz, As Billski always says 'it's in the testing' of your samples, to understand the results. I know Billski did his Caps with Uni Strips under...
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    Molding your own engine mount isolators

    I'm unable to open these types of attachments, is there a secret to to it.
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    Static Thrust Calculator

    JC's thrust formula is- Thrust (Lbs.) = HP *550*efficiency/ Velocity (ft./sec. OR Thrust (Kg) = HP *75* efficiency/ Velocity (M/s). Hope that helps. George
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    Source for Carbon Rods?

    I have also researched making my own Spar Caps , using my own Pultrusion technique. It required a Die and a Resin Bath, the tension can be maintained with a fixture winding-in the Carbon onto the shape required fixture . The Die size controls resin content and the steps in the Caps can be made...
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    Lighweight opposite 2-stroke engines

    Most engines unless it's Hydrogen have overlap to help with exhaust extraction and the Rotary is no exception. It's better to have a later fuel injection to keep that fuel out of the exhaust. George
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    Static Thrust Calculator

    Armilite, sad isn't it - I guess that was directed at my comments about Jack Norris book, however I'm having a lot of success with 72" in JC's Prop Program and 1.3 P/D it is. Could be the Rotary has more power? George
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    Static Thrust Calculator

    I found this interesting and can be confirmed on an Internet search; when considering P/D = (Pitch / Diameter) where1 is efficient and 1.3 is 90% or more efficient. George
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    Molding your own engine mount isolators

    trimtab, I have molds for things and found split molds made of Delrin easier when making complex shapes, I machine the Delrin surfaces to get a good mating surface, bolt them together and then carefully turn out the required shape. However a bit overkill for some things where the steel inserts...
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    My 13B engine configuration (tentative)

    dwalker, I've never had to exchange an Exhaust insert, is it difficult - I do like Ti. ? Pity about the cost. George
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    Source for Carbon Rods?

    I can't understand a European Company buying out an American Company and not opening in another name within the US. The current Pandemic may have stalled the transfer process- who knows. The Company in the Netherlands is D.P.P., they do quality Epoxy pultrusions, perhaps they are the company...
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    Source for Carbon Rods?

    I didn't get a response from Jim, but your response says it all. There is an European Company who sells quality Pultrusion, one of the European boys on here put me onto them. For me in Australia the costs were the same (expensive). Yes Diversifield were the manufacturers in the States, I have...
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    Possibly Interesting Pultruded Material

    The reason for using the Polyester may be that it's used externally and UV resistant, where epoxy is not. Epoxy will stick to Polyseter but Polyester sticking to to Epoxy isn't nearly as good Any Pultrusion should be considered for it's strength, with some flexibility, l like standard Modulus...
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    My 13B engine configuration (tentative)

    dwalker, I believe the 13B exhaust insert is Inconel and I believe the thicker SS needed to stand up to exhaust temps of the non turbo 13B was heavy, but that was all 13B applications the Turbo housing (when used) did the work of taking the high exhaust temps, even when used by itself (without...
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