CARF 1:5.3 BAE Hawk...electric Ducted Fan EDF
02-19-2017, 12:50 PM
#1
Thread Starter
CARF 1:5.3 BAE Hawk...electric Ducted Fan EDF
Decided to start a new thread since I have had quite a lot of contact over this project.
Starting with the std Kit 95% of the build is the same. It could have been built lighter, certainly the scale gear we used is a lot heavier than the std CARF sports gear. Scale cockpit does not need to be as heavy or details,I used the DerJet tubs and Skymaster pilot.
Schubeler supply the DS-94 (DS-98 now) with mounting lugs, to get the thrust tube line correct the fan needed mounting below the turbine bearers, so I built a support on the top side of rail (underside looking through wing seat) I positioned the fan fore/aft so that the inlet sat against the former.
At the rear I filed out the opening to the fuselage skin around the bottom 220 degrees and shaped it around the top to extend the tube and increase the outlet area a few more sq mm.
The tail tube is rolled from mylar sheet .3mm thick.
I cleaned up the inlets a little (could do more) and opened the splitter underside to increase the area again. Also bunny ears. Rear nose door left off and open as it does not notice in black.
The packs ended up on the wing centre section so that scuppered my plan to have openings in the wing skin above the gear doors...
Video
https://youtu.be/2hxKdwCMC2g
Starting with the std Kit 95% of the build is the same. It could have been built lighter, certainly the scale gear we used is a lot heavier than the std CARF sports gear. Scale cockpit does not need to be as heavy or details,I used the DerJet tubs and Skymaster pilot.
Schubeler supply the DS-94 (DS-98 now) with mounting lugs, to get the thrust tube line correct the fan needed mounting below the turbine bearers, so I built a support on the top side of rail (underside looking through wing seat) I positioned the fan fore/aft so that the inlet sat against the former.
At the rear I filed out the opening to the fuselage skin around the bottom 220 degrees and shaped it around the top to extend the tube and increase the outlet area a few more sq mm.
The tail tube is rolled from mylar sheet .3mm thick.
I cleaned up the inlets a little (could do more) and opened the splitter underside to increase the area again. Also bunny ears. Rear nose door left off and open as it does not notice in black.
The packs ended up on the wing centre section so that scuppered my plan to have openings in the wing skin above the gear doors...
Video
https://youtu.be/2hxKdwCMC2g
02-20-2017, 11:48 AM
#3
Nice scale flying! Proof that Hawk flies with wing and not with power alone. It could be 1kg less without cockpit detail and on sport gear. Jolly Good indeed! 
/Jyri
/Jyri
Last edited by jjantti; 02-20-2017 at 02:01 PM.
02-20-2017, 01:41 PM
#5
Thread Starter
Bob, older MGM TMM 25063-3. Where it's mounted it runs really cool.
Its been an interesting project, so much more than could be done on the ducting and weight reduction, but I felt if it needed every last detail, it would be underpowered!
Because there is no ducting I felt if it was too light it would need 'muscling' through the sky using valuable power. The mass holds the momentum a little better, the CARF Hawk is a fabulous platform with a properly designed wing.
Dave
Its been an interesting project, so much more than could be done on the ducting and weight reduction, but I felt if it needed every last detail, it would be underpowered!
Because there is no ducting I felt if it was too light it would need 'muscling' through the sky using valuable power. The mass holds the momentum a little better, the CARF Hawk is a fabulous platform with a properly designed wing.
Dave
02-21-2017, 02:22 PM
#9
Thread Starter
No, don't really have a way of testing and there is little I can do, so it is what it is. EDF set ups change the second it starts moving, static thrust figures mean nothing as the fan is never going to be static! The HST set up is not inlet critical and I made the outlet as large as possible.
