Foamie jet for X45/K45 ?
12-26-2019, 10:34 AM
#27
My Feedback: (16)
First flights were awesome. It is blast to fly. A real gas and go jet and so far very little maintenance. I love the size. I can pick it up move it around with out another person helping.
My normal take off technique now is to reduce thrust to half stick right after lift off. This makes a normal climb out and gear/flap retraction easy. However it will go straight up from the ground at takeoff with out any problem. I highly recommend this micro turbine conversion for lots of fun with little hassle. Just respect the airframe limits. No foam explosions needed!
My normal take off technique now is to reduce thrust to half stick right after lift off. This makes a normal climb out and gear/flap retraction easy. However it will go straight up from the ground at takeoff with out any problem. I highly recommend this micro turbine conversion for lots of fun with little hassle. Just respect the airframe limits. No foam explosions needed!
12-26-2019, 05:56 PM
#28
My Feedback: (20)
https://www.hobbysquawk.com/forum/rc...versions/page3 See Post #44
Last edited by Viper1GJ; 12-26-2019 at 06:03 PM.
12-26-2019, 06:01 PM
#29
My Feedback: (20)
Gary
12-26-2019, 06:08 PM
#30
My Feedback: (20)
Gary
12-27-2019, 10:20 AM
#31
My Feedback: (16)
Yes, I think the K-30 would work very well. There are several videos on YouTube that show K-30 flying great. Go for it! It's really fun. I think Tony Hung's is a K-30 and his photos and video inspired me to try it. He has several videos on YT and some photos on FB that I copied.
Gary
Gary
Thanks
Jack
12-27-2019, 06:23 PM
#32
My Feedback: (20)
I am actually considering putting just one brake wheel on the nose gear. Less overall weight and just as effective for taxi stopping. Easier to run wires from there. Also I could remove the nose weight I still have.
Gary
12-27-2019, 06:36 PM
#33
My Feedback: (3)
Yes the trunnions the axles are in rotate but I don’t think it would actually affect how the wheel axle would fit. I think it would be a simple remove and replace. Hardest part would be routing the wires.
I am actually considering putting just one brake wheel on the nose gear. Less overall weight and just as effective for taxi stopping. Easier to run wires from there. Also I could remove the nose weight I still have.
Gary
I am actually considering putting just one brake wheel on the nose gear. Less overall weight and just as effective for taxi stopping. Easier to run wires from there. Also I could remove the nose weight I still have.
Gary
12-29-2019, 07:16 PM
#35
My Feedback: (20)
02-19-2020, 06:52 PM
#38
My Feedback: (20)
Freewing 90mm F-4 EDF Turbine Conversion
Many people have ask me to post photos of my F-4 turbine conversion using a K-45G3.
Here we go. Not all in the exact order but you can get the idea.
All credit here goes to Paul Appelbaum and his conversion design and his custom fuel tank. I followed his lead except for the tail mounted turbine. I used the same turbine mounting in the tail as I did on my first F-22 conversion.
First step was to get exact weight and CG from the EDF that I flew for several months with a HRB 6S 6000 mah battery. My CG was at 203mm from the LE with about 2.5 oz lead on the tail. The book CG was 190 which I found to be very nose heavy. The EDF weight was 8.55 lbs.
The next step was how to fit this stuff in the F-4 foamy. Answer...follow Paul's example.
Many people have ask me to post photos of my F-4 turbine conversion using a K-45G3.
Here we go. Not all in the exact order but you can get the idea.
All credit here goes to Paul Appelbaum and his conversion design and his custom fuel tank. I followed his lead except for the tail mounted turbine. I used the same turbine mounting in the tail as I did on my first F-22 conversion.
First step was to get exact weight and CG from the EDF that I flew for several months with a HRB 6S 6000 mah battery. My CG was at 203mm from the LE with about 2.5 oz lead on the tail. The book CG was 190 which I found to be very nose heavy. The EDF weight was 8.55 lbs.
The next step was how to fit this stuff in the F-4 foamy. Answer...follow Paul's example.
Last edited by Viper1GJ; 02-19-2020 at 08:07 PM.
02-19-2020, 07:14 PM
#42
My Feedback: (20)
Underwater tank test
Checking CG for turbine tail mount or mid mount with pipe. I elected to go with tail mount as the prediction only needed about 2.5 oz in the nose and saved me lots of money for a pipe.
Foam drill made from 1/4" brass tube sharpened on one end
G10 used under bolt head to keep from crushing the foam.
Last edited by Viper1GJ; 02-19-2020 at 08:09 PM.
02-19-2020, 07:26 PM
#44
My Feedback: (20)
Carbon tube used to eyeball thrust line in alignment with EDF thrust tubes
Carbon tube is near parallel to panel line on side of fuse
Foam cutting knife from Amazon
Cutting slots for engine mount braces
02-19-2020, 07:34 PM
#45
My Feedback: (20)
FOD cover made from .010 G10 material
BVM heat blanket felt material glued to foam above turbine and aft of exhaust on bottom of tail
Heat blanket covered with aluminum HVAC tape
Ink removed from HVAC tape with acetone
Tape painted with silver acrylic craft paint I stole from wife's craft room.
02-19-2020, 07:46 PM
#46
My Feedback: (20)
Final weight and balance being supervised by Pixie!
Stovepipe from hardware store to protect tail during turbine starting
Weight and balance with take off fuel and landing fuel and fuel system tests using pump test in ECU
Turbine run tests
Ready to fly!
02-19-2020, 07:51 PM
#47
My Feedback: (20)
After several flights no heat issues under tail at all. Nothing done to stabs.
New MAP 2 oz air trap
Tank marked in 200 ml increments to calibrate the CTU for fuel telemetry
Turbine filter installed vertical to avoid trapped air
Start pipe in use
Last edited by Viper1GJ; 02-20-2020 at 06:19 AM.
02-19-2020, 08:04 PM
#48
My Feedback: (20)
Final weight was 8.55 lbs empty with 2.5 oz of lead on battery box. Take off weight is 10.9 lbs. Landing weight with 30% fuel remaining is 9.15 lbs. Landing weight CG is 86mm from main landing gear on the Xicoy CG machine which is 202 mm from the LE. The FW book CG is 190mm so I am 12 mm aft of the book setting and it lands very nice. Take of CG is 199 mm from LE. Rotation is nice and it does not jump off the ground. Control throws are standard. I have about 10% rudder to aileron mix with flaps down to assist with adverse yaw. I get 6-7 minutes flight time and land with about 30% fuel remaining. Overall it flies very nice. I keep the speed below 100mph similar to my max EDF speed and have had no problems. It will go much faster but I want to avoid a foam explosion.
Good luck. It makes foamy jets much more exciting.
Enjoy,
Gary
Good luck. It makes foamy jets much more exciting.
Enjoy,
Gary
