ptag.dev(at)tiscali.co.uk
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 Posted: Wed Apr 15, 2009 12:57 am Post subject: Was RE: Mod 70.... Now my ramblings on my trike nose wheel s |
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Karl and all,
IMHO the steel springs or the bungee on a trike nose gear are all meant to purely accommodate severe shock on a bad landing which otherwise would have a drastic effect on the nose leg, that is it permits the leg to move upon receiving a sudden load which otherwise would take it in to yield stress regions. The so called suspension of the nose wheel depends entirely on the leg itself flexing. ( That’s not to say I like the idea so don’t shoot the messenger!) In any case too much suspension you need a new propeller ! I had a bad experience with the bungee ( well one or two really !) when the bump stop had passed through the lays of reeved bungee cutting through the bungee letting the nose leg extend to the wire safety strap. Francis Donaldson gave me dispensation to put the bump stop the other way up fixed to the upper tube and bumping on the leg between the lays of bungee. This worked OK and so it didn’t need to pass between any bungee reeving. ( I also managed on a wheel barrow landing to bend the leg downwards prompting Neville Eyre to quip “had I landed wrong way up ?” Andy Draper was present and so realized there and then that due to the geometry of the castering pivot any load from forward of the wheel centre line actually will result in the leg being bent downwards!
Since my nose wheel departed on a “greaser” landing event (now with the leg replaced and springs employed) I have an extended pivot spindle with two roll pins as keepers in place of the single one all has been well.
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