Originally posted by Badge
This is stated by Dave over on the Scale Aerobatics.com Forum
"The Turbo Raven has a 102 inch wing span and is 87 inches in length. The current flying prototype comes in a 24 lbs but we could come in at around 20 if we made a serious effort. This model is currently powered by a MacMinarelli 85 Twin but most similar power plant designs will work. Currently we are also working on a Turbo prop version of the kit with JD Enterprises. It will be turning a 3 blade 28 /10 at about 30-35 pounds of static thrust. which will give an incredible power to weight ratio. We are working on a couple of designs for a variable prop but they are in the early stages."
a well the 28x10 is impossible
the turbine will not take it it will exeed more then 800 degrees on the temp resulting in shutting off
or need to set the rpm,s of the turbine less then 130000 rpm,s
ours is set at 150000 rpm,s
then it will have about 35 punds of thrust yes
we tryed a 22x11 3 blade carbon from fuchs
the plane went of the runway lifted off, but turbine then switched off because of over temperature +800 C and had no responce.
it was flying totaly underpowered
believe me i am testing this model since december and tryed plenty props
the best one yet is the 22x10 mentz wooden prop
this way the turbine responces nice and is fast on maximum thrust
prop speed is about 9500 rpm,s and while in air
it hits the sound barrier (prop)
however we want now to test a 24x8 mentz
about the weight
well they say wood is always lighter however i could be wrong
ours is made of wood
total weight 14.4 kilo,s
incl:
2 x 5cells sanyo 3300
1 x 6 cells sanyo 3300
fuel 2 liters dubro tank
8 digital jr servos
1 fuelpump
1 oilpump
1 50cc oiltank
1 x mcu for the turbine
here is a video
of the start , taking off etc
http://209.15.85.5/neelix/turbines/raven.wmv
if you hear brabble yes it is in dutch
discussing how nice kerosine smelled ;-)
and how fast it went with the spinner mounted
last you see the landing wich was on a very windy day 5-6
the model flice very nice and has no "surprises"like leaning to left or right or break out it will fly strait
you can hear on final reving up the turbine a little
to make shure we made it to the field
this is the turboraven from
www.atimanufacturing.co.uk
turboprop by wren turbines
regards
Sandor