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Hi Mark
Unfortunately the penalty with no moving parts is the aircrafts airbourne endurance , its all tradeoffs , the greater the complexity generally the lowest fuel burn per unit of power output , and the longer you stay in the air .
Horses for courses :-))
Cheers
John

Hi LOL... I hope it made sense , just trying to tell it as I see it :-)) I guess most guys start on PJs initially because of the simplicity of construction then move onto the more complex gas turbines , firstly pure jets then shaft power gas turbines , I'm coming back the other way so will probably ...

Hi Steve Water jackets etc, are generally only another thing to go wrong. Its more the massive amounts of frictional drag that will be the problem , if you workout the surface area of the spike and outer wall together it'll be several times the area of a "normal" exhaust pipe , also the closesness o...

Hi Steve I've had a look at the drawing of your "engine" and if you don't mind I'll add my 2 cents worth . The spike will be almost impossible to keep cool , but I feel its greatest disadvantage is its length and the massive amount of drag created by all that extra surface area , high gas speeds don...

Hi Guys
They've just built a pilot plant here in Oz of a wave generator , its down in Woolongong harbour , big bugger of a thing with the air dispacement driving the turbine both ways
Cheers
John

Hi Steve Just had a look at the turbine you used, and its a reaction type , I would assume we need an impulse type where there is no change in flow area thru the turbine , hence no need for pressure drop as with a reaction turbine , a PJ doesn't have ( I'm assuming , don't really know) any static pr...

Hi Ben Hi Bruno Hi Horace Yep , its me :-)) Thanks Ben , for explaining the freepower , it really is a lot simpler than trying to use a "singleshaft" engine to power a land vehicle , single shaft engines work OK in aircraft with variable pitch props though . The kart produced 160 lbs of pull when st...

Hi Guys My names John , live in Australia and have just joined your forum . Having built 2 homebuilt shaft driven gas turbine vehicles in my shed , a bike and a kart , see here, http://www.nickhaddock.co.uk/jetgallery.htm I've recently started work on a simple turboprop using a 1100mm dia industrial...