I am about to put together a Redwing 30cc Orange SBACH. I bought the plane from one of our club members and doing the initial inventory it did not come with a spinner. So I ordered the painted carbon fiber spinner from redwing. All tubes and landing gear are carbon fiber as well. Here is what is going in the plane:
Equipment I will be using:
DLE-35RA (Tower Hobbies)
Demon Cortex Gyro (3DRCParts)
Hitec 5645MG servo's all the way (Tower Hobbies)
Futaba 7 channel receiver (I fly the Futaba 14SG)(Tower Hobbies)
Life batteries (2 for receiver and 1 for ignition)(Tower and Roys Hobby shop)
Powerbox pro (Red version)(Redwing RC)
Fortitude fuel tank (Redwing RC)
Miracle round "Black" fuel dot (Valley View RC)
Xoar "Sword" 19x8 prop (Valley ViewRC)
Feel free to jump in, all comments are welcome.
Made it home early this morning and opened the box for the spinner. Pretty cool. It is not cut so I will have to do the cut outs for the prop.
Anyone have any tips?
Dry test of the Powerbox Pro. This unit provides a clean 5 volts to the receiver and allows 6.6 volts (straight voltage) from the Life batteries to go to the servos.
Also has an Optical kill switch and allows the 2 batteries to power the igniton circuit. This eliminates a 3rd battery for igniton.
Nice unit and the price is good as well. Bought this one from Redwing RC.
Started the actual build today. The instructions are very vague. However doing some research on the other 30cc SBACH sites you get the gist of what they are trying to tell you. Hope my pictures and instructions help any who are building this bird out.
First thing was to locate the Tailwheel baggie. Remove and lay out the parts. Next was to install the tailwheel follow through bolt through the carbon fiber tail wheel and then tighten the nut. Next up was to install the tail wheel using to locks to center the tire. Then install the tailwheel assembly through the mount.
After that was accomplished, you place the tailwheel carbon fiber assembly on top of the fuselage and using the 3 self tapping screws, screw the screws into the empennage area.
Then using a 3/16" drill, drill the bottom rudder for the steering mount. Using 5 minute epoxy glue the steering mount into the rudder. Ensure the smooth portion of the assembly stays outside the rudder. Only the serrated edges need to go inside the rudder assembly.
Trial install to ensure the fit is where it needs to be. Set aside the assembly for now.
Today was installation of the main landing gear and wheel pants. First thing was to locate the MLG parts bag, then lay out all the parts. Unwrapped the wheel pants and discovered the right hand pant had paint peeling off the outside cover. I wet sanded the exposed area then used epoxy self etching black paint to recover the outer wheel pant. Came out extremely well.
Then it was bolting on the carbon fiber landing gear to the fuselage area. The bolts go through the fuselage and there is a pre-installed "L" metal plate that the bolts go through. The nuts "4 each" then get threaded on and torqued.
After the CF landing gear is installed the axles get mounted then the wheels and pants get installed. Then dremel the axle extra length off prior to installing the wheel pants.
All together this little chore took me about 6 hours to accomplish. It would have taken only about an hour but the repaint took time.
This morning I went to build the wing assemblies. First thing to note is the covering has excessive wrinkling (This is normal and expected). I got the old monokote irons out and fired them up. Then smoothed out the wrinkles on the wings and ailerons.
Next up was to cut the servo access panel out of the main wing. Then used the detail iron to smooth out the covering on the hatch.
Then it was to locate and cut the 2 slits for the aileron control horns. The instructions show super glue being used to install the horns but I used 5 minute epoxy for some extra assurance.
The instructions show an entirely different servo setup than what is actually provided in the kit. As such I had to fabricate 2 wood stand off's for each servo so they can attach to the servo hatch with strength. It is really not an issue but you would think that the kit manufacturer would place some wood stand off's in the kit. I had to go to the hardware store and buy the wood, since I did not have any in my shop.
I am using Hitec 5645MG servos all the way around.
Not shown: all the control surfaces use the "ROBART" style hinges. Non of the control surfaces are glued. I use Gorilla Glue (Original) that expands 3 times. The first thing I do is to install the aileron onto the wing and get the hinges rotating with no issues. I then deflect the aileron to the down position and remove the aileron. This allows the hinges to remain in the wing. I then use the Gorilla glue and place glue up to about 3/4 the way up to the center of the of the hinge point. Then I use my fingers and ensure the hinge points have glue all the around the hinge. Then I install the aileron back onto the hinge points and allow to dry. This takes about an hour. Then I remove the aileron with the hinge points and repeat the process and install the aileron back on to wing and allow to dry. Be careful that you do not get glue on the hinges. If you do your going to have to work the hinges until they are free. You can use some machine oil by squirting some oil on the metal hinges but if you are careful and don't use an excessive amount of glue you don't need to.
Will post more later.
First thing this morning was to get the spinner mated to the engine. It came from RedWing uncut. Just a little note. If you buy a kit second hand, redwing will not provide to you missing parts under warranty. You will have to purchase them. I did this and the only issue I have is that all kits are supposed to come with a spinner and back plate already cut for the prop.
So using a contour gauge. I centered the backplate on the DLE 35 engine. Then used some craft poster board to transfer the pattern from the contour gauge onto the spinner. Cut inside the lines using a dremel. Be slow and take your time. Going back and forth with the dremel and the spinner, I was able to get it to mate within an hour. Pleased with the way it came out.
Next up was to install the left wing servo, hatch, blocks and epoxy in the aileron control horn.
Does not look like much but been busy since 7:45 this morning and it is now 1:47p.m. There was a trip to the hobby store as well. about and hour or so haha.
More to come
On to the rudder. I am not pleased with the setup as provided from Redwing at all. The wires that exit the fuselage are low to the exit guides. They provide a carbon fiber control horn but no instructions on how to install it. Piss poor engineering on whoever designed this arrangement. I am going to the hobby store tomorrow and make it right. The current system is a NOGO.
Anyway here are the pictures of progress so far.
More to come
Last night I found out that the carbon fiber rudder horn wires need to cross over and make an "X" prior to exiting the fuselage. Could not believe how drastically that little change helped. Anyway I changed out the control arms for the pull pull wires as the as supplied ones are too stiff to allow movement. I purchased some Dubro 4-40 Monster ball links (Part # 2317) and problem solved.
Onto the Horizontal stabs.
First order of business was to iron the wrinkles out of the covering. Then open the slits for the control horns to go into. Note the control horn needs to be cut on the first notch here. if not it will protrude on the other side of the elevator. 5 minute epoxy and allow to harden. Then it was using Gorilla glue to install the elevator to stab hinge points.
That is it for now. Letting the adhesives cure/dry and will post progress as I continue. Next up should be installing the stabs to the fuse.
More to come.
Stabs installed and elevators. Servos installed. Pictures tell the story. Also installed a 24" servo extension on each servo with keepers.
Installed the engine and could not resist putting her together. About 3 more days and she will be ready for the maiden.
More to come
Been busy today.
First thing was to add the Miracle Fuel dot, optical kill switch and RPM sensor then the fortitude tank. I then added the Throttle and choke Servo's. Next up was to add the Powerbox Pro and dual batteries. Then hooked up the controls and get everything working as it should. More later.
Got back from Cozumel and New Orleans on our cruise. Started finalizing the wiring. Added the Demon Cortex Gyro and Decals. Also added the optical kill switch. Tomorrow will need to get a couple of extensions for the wings and then I will be able to finalize the wiring and sort out where the powerbox and demon gyro are going to live. Need to get my CG machine out and my control throw machine. Getting closer.
More to come.
Fired up the DLE-35RA for the first time today. Need to work on the idle as it is a tad high. Then set the CG and double check everything. Then maiden.
All: Got the idle where it needs to be. Then got the CG spot on. Had to use 6 ounces of weight under the engine box. I am a tad bit nose heavy and that is where I like to start. Adding pictures of RPM gauge, Demon Cortex Gyro and miscellaneous stuff. Going to work on the aileron and elevator ball links tomorrow. The hardware that came with the kit is not functional at all. I bought some Dubro Monster links to change out to.
Nice plane with nice accessories. I'm interested in how well the Cortex gyro performs and how easy/difficult it is to setup.
When is the maiden flight?
Simple to install. Assign it to a 3 way switch. Set the high and low gains just like setting end points on a servo. Mine is set to hold currently at 40% and low is at 20%. Will adjust as required. Airplane is ready. Waiting on a good weather day. Still need to put some time on the engine
Tried to get the maiden in this morning but the wind was too high. Will try again tomorrow
Got her maidened this morning. No one was there to take video or pictures of the flight. However Fernando took some pictures post flight.
Proud to say that the plane flew with no trim changes needed. There is a slight pitch up when applying up elevator (will have to check expo etc.).
Engine flew excellent with no bobbles after tuning on the ground.
Very good flying plane. With the Demon Cortex Gyro turned on to low rate the airplane just went STABLE. very excellent performance all the way around. This airplane rocks.
I have 2 flights now on the SBACH. Today's flight 2-13-2015 was to see if moving the batteries helped with the abrupt pitch up when applying up elevator gently. So here is the synopsis.
1. Both batteries are at the firewall: When flying today to maintain level flight the plane needed 2 clicks of up elevator.
2. Dual rate was at -20% (Now at -30%)
3. Control throws at the elevator are set to 60% up and down.
4. Plane was still "Pitchy" when applying up elevator very gently with gyro turned off.
5. Since I was airborne, I went ahead and applied "High" rate to the gyro. The airplane "Locked" in to the heading and all that was needed to maintain the heading and altitude was throttle manipulation. No wing rock or side to side movement was noted.
6. Placed gyro in the "Off" position and you can see the airplane being rocked by the wind. Still very flyable and comfortable. However the airplane is being knocked around by the wind and is noticeable.
7. Placed the Gyro in the "LOW" rate mode and the airplane immediately settles down as if the wind has been turned off. Plane feels like it is on rails and flies very nice in low rate mode.
8. Made two touch and goes. One with no gyro and the other with gyro in low rate mode. With the gyro turned off the nose has a very docile downward and predictable descent to touchdown. With the gyro in low rate mode as you turn base to final unless you drop the nose it will stay put. In other words reduce throttle and input a very slight down elevator command or down trim to get the nose to drop. If not it will try and stay level and you will have to work to get her on the ground. Although it is no big deal either way. I prefer to have the gyro on low rate and "fly" the plane to landing. Reduce the workload on cross winds etc. Very predictable.
9. So now to adjustments made today. I left the throw on the elevators at 60% and moved the rod end up to the next hole on the servo side. This reduces the throw and as such, I will need another flight and see where I need to adjust further to get her "Just right".
Love this airplane and engine combo. I take off at about 50 to 60% percent throttle and once airborne and on the downwind leg reduce the throttle to about 10 to 15% and the airplane is happy there for test flying. It also allows me to perform checks as the airplane flies just awesome at that throttle position. Will update when I can. Pictures enclosed. If anyone has input, please feel free to chime in.
Got it worked out. Found that the elevators were not moving smoothly and the cause was dual rates were fighting the primary controls. It was my fault as I set the radio up that way. After programming in a new model and I went through a new programming episode. She now flies as expected.