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  1. B

    Understanding pulleys and tackles formulas?

    Its conservation of energy. Energy is force x distance. The energy in has to equal the energy out so half the distance means twice the force. The pulley diameters are irrelevant.
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    Welded aluminum brackets?

    Is it a weldable grade of alluminium like 6000 series?
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    Onan Engine Info

    This is a good starting point.http://www.quickheads.com/index.php?option=com_content&view=article&Itemid=265&id=1484
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    Onan Engine Info

    An Onan was used by Bert Rutan in the original Quickey so there must be information arround on the Web.
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    Briggs & Stratton 993cc "Big Block" engine conversation thread

    Slide carbs are much less prone to icing than butterfly carbs whatever they are fitted to as there is no obstruction downstream of the jets to collect ice.
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    B&S 49-series (810cm3/49ci) for aircraft use - TiPi's Q&A thread

    1)I'm using a high pressure electric fuel injection pump, not the standard crankcase pressure pump. 2)Until the pooled oil in the rocker boxes is pumped out there is no crankcase venting at all so the pressure could rise to quiet a high value. I suspect this is why Rotax are so keen on burping...
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    B&S 49-series (810cm3/49ci) for aircraft use - TiPi's Q&A thread

    An update and warning on my inverted 810cc Briggs. I finally got to a stage where I could think about starting my engine for the first time. The engine is mounted on a test stand that simulates the firewall forward part of an SD1. The engine is converted to inverted by running a direct feed...
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    Thread Rename: How to build a dynamometer for an aero engine running a prop ?

    I'm making a similar test stand for my inverted v-twin. The centre or the pivot doesn't have to line up exactly with the crankshaft.
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    VSI shows descend in flight

    Those symptoms could happen if the VSI case is leaking and you have connected it to pitot instead of static.
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    Experimental Aircraft Oxygen Systems

    Mountain High do an electronic demand system that can be used with a canula up to 18000ft and is very economical in oxygen use. Mountain High Aviation Oxygen Systems
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    Molding your own engine mount isolators

    Just to followup on my previous post, here is a picture of the very simple mold for my engine mount rubbers. It will do 8 in a batch.no
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    B&S 49-series (810cm3/49ci) for aircraft use - TiPi's Q&A thread

    I'd be inclined to fit a pair of Mikuni VM carbs to cover the icing and power side but I think a variable timing ignition would be required to get a slower idle.
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    Molding your own engine mount isolators

    Picture of the mount and the urethane rings. Next time I'm in the workshop I'll take a photo of the crude mold.
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    Molding your own engine mount isolators

    Don't know about tweeking the brew but casting the mounts thicker will make them softer and pre-compressing them with the through bolt will make them stiffer. The idea is to get the natural frequency of the engine on its mounts lower than the idle frequency of the running motor.
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    Molding your own engine mount isolators

    I used this. Xencast PX30 Soft Flexible Polyurethane Resin - Easy Composites but there is also 60 grade. Made a mould out of slices of pvc water pipe and some ally bushes and painted everything in release agent from the same company. Also got some black pigment. They've been installed for 3...
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    The BuzzProp - light weight power with only one moving part

    Same principle as Fairy Rotodyne. Worked fine but killed by excessive noise from tip jets.
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    Elastic, camber changing flaps

    The Slingsby Vega had it on the flaps.
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    Ballast - Weighted Tailwheel

    For gliders you can get brass tailwheels which add about 1.5kg. Not sure how that might affect a castoring tailwheel though. Wheels - navboys.com
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    Budget Ultralight

    The aircraft in the UK SSDR catagory don't require any design approval. They simply have to meet the max weight and stall speed requirements (and nobody checks the stall speed if the wind loading and configuration seem plausible.
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    Buying a laser level...any recommendations

    Why not use a water level. Same accuracy over any length and cheap. Does work best with two people.
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