White Diamond revealed! - single sheet DTFB flier
- Thread starter JGplanes
- Start date
jfaleo1
Junior Member
Thanks and enjoyed meeting you as well , you are passionate about the hobby and it shows. Thanks.
jfaleo1
Junior Member
I enjoyed meeting you and your father. You are very a very talented design engineer. I wish you good luck and if you ever want to talk aerospace careers let me know. Good luck this is a great design and fun with the EDF.
jfaleo1
Junior Member
I am running on a 50mm 5 blade 3S Hobby King unit. that is right about 1:1 power to weight ratio. I am thinking of enlarging the design with a 64 or 70 MM 4S unit.
well from experience I can tell you I have my EDF about an inch or so aft of the CG with a thrust tube all the way to the tail. If I mounted it aft like you have there ( which I did). It comes in very tail heavy. With a canopy to protect the battery and a 1000mha battery, I had to add 4.5 oz to the nose to get barely neutral balance.
YMMV. Good luck
Jeff
L Edge
Master member
Pic above was to show I'm going to do both prop and 64 EDF.
I am first enlargen the size so I can find where CG and where to position the EDF in the future.
Since I am going to use a 1300 3s for both, going to do things slighly different so I can adapt to the EDF once I get a feel it.
For my setup with Thrust Vectoring, the added weight of the TV at the exhaust will require me to move the EDF forward. Don't want to add additional weight for balance. Will build another model for the EDF.
Are you reducing the exhaust nozzle diameter?
I am first enlargen the size so I can find where CG and where to position the EDF in the future.
Since I am going to use a 1300 3s for both, going to do things slighly different so I can adapt to the EDF once I get a feel it.
For my setup with Thrust Vectoring, the added weight of the TV at the exhaust will require me to move the EDF forward. Don't want to add additional weight for balance. Will build another model for the EDF.
Are you reducing the exhaust nozzle diameter?
L Edge
Master member
Just finished the maiden flight. Used a 9 x 4.5MR APC so when I get a chance I am going to explore with different props. Took off at 1/2 power. I can build, but I can't paint or get the dye off the FFFoam. So that is my downfall.
Will it adapt to a 64-- JGplanes?, you bet it will!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Going to set it up building with the TV off and then on.
You built an excellant model JG, ever think of molding a nose for the plane? The design is so simple to cut and build.
Will it adapt to a 64-- JGplanes?, you bet it will!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Going to set it up building with the TV off and then on.
You built an excellant model JG, ever think of molding a nose for the plane? The design is so simple to cut and build.
JGplanes
Active member
jfaleo1
Junior Member
Yes I am reducing exhaust, can’t remember what my exact ratio was but I think it was 80 or 90% if fan area. And length was about 3.5 to 4 times diameter. Thrust vector might be fun but it is twitchy and easy to lose yaw stability already, other side of that is TV may help spin recovery.
If you look at mine I built up a small “canopy” on the nose for the battery. On a larger one I may make it a bit more sculpted and bring it further forward for a different look ( more space fighter or cruiser).
Oh yeah JG all three of mine got home mostly intact👍🏻
Good luck
L Edge
Master member
Over time, the tip of this plane as well as others that I have gets dorked in the ground or hanger rash so the tip never ends up straight again. If you can produce a small triangle (top and bottom) with sides so you can insert over the tip and glue, it will serve 2 purposes. Keep the tip straight and will take some of the stress(of the foam) as the battery hits the ground with the dihedral.
Raining, so decided to cut out the 64 EDF version. Anybody doing a 50, should do well with your size diamond.
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L Edge
Master member
Did you know that if you reduce the exit area you increase the exhaust speed, but you reduce the thrust output of the EDF?
jfaleo1
Junior Member
Yes I am. On this I exceeded the weight of the aircraft in thrust either way. And was working to get an optimal output for the application. Using several online sources I went for the 90% exhaust to fan and it seems pretty good the tube with no reduction was no better at all and the one with more reduction felt bogged down. The best has been the 90% and the airframe as designed save for the EDF and small canopy for the battery.
I’m planning for a larger version as I said but with a fuselage of sorts with minimal wing change if possible.
L Edge
Master member
JG
I ended up playing in the wind today(5-10mph) first by giving 5 degrees down on the motor without the "udder rudder" and then installing it.
Hard to shape rudder to look "futuristic", but what a difference in the wind. Going to do 64 now since I have a handle on flight environment. Should fly at real slow speed as well as fast just like yours.
I ended up playing in the wind today(5-10mph) first by giving 5 degrees down on the motor without the "udder rudder" and then installing it.
Hard to shape rudder to look "futuristic", but what a difference in the wind. Going to do 64 now since I have a handle on flight environment. Should fly at real slow speed as well as fast just like yours.
L Edge
Master member
You bet I will cover that. In fact, I have dropped other projects to get this one done. Really like the behavior of this one. Latest is that it flies pattern manuvers (stall turns, inverted , low and slow with cross wind) and yet goes fast. Haven't even tried different props. In fact, I should be doing my build work, but spent 2-3 batteries every day enjoying flying it.
JGplanes
Active member
Glad to hear you're having fun with it. She definitely has some wonderful flight characteristics when you get to know her. My two favorite maneuvers are the "elevator" (ultra slow vertical landing from 400'), and the ultra slow stall turn. But she'll go fast too, and I'm going to put a rocket motor on it when I have the time. 
BTW the flight characteristics also make an awesome micro FPV platform if you're into that. It's kinda like the tiny whoop of fixed wings.
JG
BTW the flight characteristics also make an awesome micro FPV platform if you're into that. It's kinda like the tiny whoop of fixed wings.JG
L Edge
Master member
Not into FPV, what I am looking forward to is to compare prop flow(over and under fuse) to only flow over top with TV.
Would be interesting to try a rocket on it. I did a Bell X1 with a D rocket and it went up over 400 ft and I flew it back down. Entire flight was about 30 seconds long.
Would be interesting to try a rocket on it. I did a Bell X1 with a D rocket and it went up over 400 ft and I flew it back down. Entire flight was about 30 seconds long.
L Edge
Master member
JGplanes- Well, the EDF has just completed 10 chucks in 95 degree weather. Launched at about 1/2 throttle an travels at about 1/3 throttle.
Flights are about 100 ft or so, working on the nose up problem. Set up with 3 mode were mode 1 no TV, mode2 has the elevator and TV nozzle working, mode 3 with elevator and rudder TV.
Very little drag like my X-47B, recharged battery and put in only 293mah out of 1300 battery and not past half throttle.
Your design does offer some interesting challanges.
In regards to prop, with 20 degree di, I got to do some entire figure 8's inverted!!! That's different.
Flights are about 100 ft or so, working on the nose up problem. Set up with 3 mode were mode 1 no TV, mode2 has the elevator and TV nozzle working, mode 3 with elevator and rudder TV.
Very little drag like my X-47B, recharged battery and put in only 293mah out of 1300 battery and not past half throttle.
Your design does offer some interesting challanges.
In regards to prop, with 20 degree di, I got to do some entire figure 8's inverted!!! That's different.
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