digitech
Posts: 1743
Joined: 8/23/2004
From: klimmenlimburg, NETHERLANDS
Status: offline
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[QUOTE]Originally posted by shockwave
Hello Sandor,
Nice model of the Raven, Hats off to you for putting the turbine in and getting it flying  . What kind of lag time are you getting with spool up. Reason I ask is that I have been working on a way to maintain a specified Rpm say 130K then control the prop pitch which should dramatically improve the lag time. Hopefully this will allow for true 3D flight.
Is the Ati kit built up or fiberglass?
Take Care
David. [/QUOTE]
hi Thanks!
well the lag is about 3 seconds from idle to full power
(45000-150000)
the problem you describe with the prop pitch :you would have the following problem , how can you hold 130000 rpm,s
if you play with the pitch the rpm of the turbine will go down so is the prop speed
with the wren engine its not direct driven this means
it is less sensitive to slower speeds or higher speeds
so the turbine will always hold the selected rpm,s
it is just feeding more fuel to hold , offcourse keeping in mind the temp does not exeed the maximum.
however you will still have a delay , the delay i measure is about 1.5 seconds between 90000 and 150000
mainly because of the fadec full auto , since the fadec desides
how fast the engine spools up or down , looking at ambient temps
, engine temp , fuelflow
so basicly lots of practice
but! just listen to the sound from the engine and the prop
i cant describe it , but its just awesome hearing the sound of a prop coming and leaving mixed with a true jet sound!
i will try to record some avi film and put it on the net
everyone is just amased how easy this engine is started by just a movement of the stick
i must say it is Wren Turbines who get,s the credit
its a real pleasure just to buy it and leave it on the teststand that comes with it , i was complete new to turbines
but the usermanual was very clear with full color pictures
how it worked , seting it up maintenence etc etc
actualy i bought just a black and decker stand
to hold the engine , bought kerosine , programmed my rc
very easy , and start it!
they deliver it with all pumps , battery,s etc etc
after running it for a few weeks on the stand , offcourse everyone wanted to see it so i had to drag it every week to the field just to start it!
i made over 50 starts ,with just 2 recharges on the battery,s
running it more then 2 hours in total , played with different props
had only 1 flame out due to a 1 way valve i put in , so that the fuel would not go back to the container wich was a mistake from my side it toulk some air in the line , so after full power then idle it blew out...
investigated , called wren and found that the problem was on my side
anyway its good to run it on the stand to see what is going on
the Raven is made full out of wood
making it very light
raven can be bought at [url]www.atimanufacturing.co.uk[/url]
it is allready prepared to hold the wren turboprop
incl all the preset,s ,room for the ecu pumps etc etc
regards
Sandor
_____________________________
Sandor Kruise
Dealers for:JetCat,Graupner,Futaba,Fei-Bao,Pro-Lynx,Airpower,Jets-munt,Xicoy,Jet-1A,Composite-ARF.
"Home of the Pro-Lynx Gears"
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All Forums >> RC Airplanes >> IMAC >> Re: Raven 
Re: Raven - 
I think my wife would strangle me If I proposed to go to Europe to fly my plane 
BEAUTY - 
Turbo Raven. - 
I really appreciate it. 
HA HA LOL!!! -