Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

twin deltas

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Old 10-11-2002, 06:37 PM
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marc sommer
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How about this one then?Twin 53s,APCs,4 tanks,spring air retracts.Scarey performance out of my only side by side attempt.By the very nature of the engine position a lot of weight had to be added to the rear end-an obvious solution is to put an engine there instead.Assymetric flight only to be contemplated with a clear head.Please bear with me on these wretched photos-I have been trying to use jpeg but the rcu website says my files are too large,thankfully I am better with aircraft than I am with these contemptable computers.One solution I saw had the props cutting through slots in the wings but,try that with high RPMs and it is asking for a prop break-up due to the change in prop loads with each RPM-I KNOW!!!!!I have another attempt to show you which I shall do as soon as the photos come back from yhe developers.On the building board at the moment I have a machine that is intended to be up with the turbines using two Rossis-I will post its Progress.Regards,Marc Sommer.
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Old 10-11-2002, 11:43 PM
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I want it I want it I want it!!!!!!!!
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Old 10-14-2002, 03:50 PM
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Default twin deltas

you given up on that Rapier?
whats this about breaking props? i'm thinking about doing something looking like yours, but a mid mounted MVVS GRRT, 22k
heres your pic as a Jpeg
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Old 10-23-2002, 07:17 PM
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marc sommer
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Default twin deltas

Phiily baby,yep,I played around with mid engine deltas last year.They are the obvious solution to virtually every issue using one or more engines,especially cg.Trouble is you lose a massive amount of thrust working the prop in a slot-put the scales on it and you'll see what I mean.Worse than that I had two prop breakages for no apparant reason,but only when I started using higher rpms.Props in slots are pants.I get massive amounts more performance keeping the props external-especially with two engines.Regards Marc Sommer.
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Old 10-23-2002, 07:58 PM
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i'm sure i heard you have to have a certian clearance for the prop if you did this. there was an old plane here back in the 80's called a Preditor that was like this, they wernt slow and i'd love to have sommit the same, if only i could find a pic of one.
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Old 10-25-2002, 01:17 PM
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Marc,

Cool airplane! Must have a cool sound in the air.

May you be the first to break the 200 mph barrier!
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