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Archive for August, 2019
Posted by VicT | Aug 28, 2019 @ 06:07 PM | 1,485 Views
I know I tightened my prop adapter too tight because when I removed the nut I saw pieces of aluminum threads. The adapter threads were damaged beyond use. As an experiment I cut away the damaged threads and used the same nut on a thinner grey APC prop to see how tight I could get the nut without damaging the threads. I tightened the nut to finger tight and marked with a Sharpie pen the 12 o’clock positions of both the nut and threaded prop adapter. I then used a wrench to tighten 1/4 turn (3 o’clock). I proceeded to turn the nut to the 6 o’clock position. I then went to the 8 o’clock position and with a motor restraining tool tried to make the prop slip on the shaft. I could but it was difficult. I then removed the nut easily (not jammed) and inspected the threads and no damage was found. The black plastic 8 blade prop and the grey APC prop are similar but could have different compressibility so this test is only a guide.

I am waiting for larger 5/16 (5mm shaft, 8 mm prop bore) adapters from a non Eflite company to compare the gripping difference.
Posted by VicT | Aug 28, 2019 @ 02:50 PM | 1,414 Views
I flexed the two elevators to eliminate binding but did not check the elevator pushrods. I pried off the plastic cover and removed the output arm. I saw that I had about 5-8 degrees up and about 30 degrees down before binding. Using hemostats I pushrod back and forth on the pushrod about 100 times to eliminate the binding. Now I get about 30 degrees up elevator without binding. Now the elevator servo won’t get worn out as quickly. Such a shame there is not a redundant elevator servo on a Y cable to operate one elevator when the other one fails. See pics.
Posted by VicT | Aug 27, 2019 @ 11:51 PM | 1,614 Views
I like my new EC1500 but do not want to lose the 5 bladed prop and spinner in flight. The loss of control and crash into someone/something concerns me. Last week the right prop , spinner, and collet departed the motor shaft while I was applying full power on 4 S while on the ground. I had about 10 minutes of scale like flying two days before with no problems. Apparently that 10 minutes was enough to reduce the grip between the aluminum collet and steel motor shaft. I remounted the undamaged prop and re tightened the nut a little more than what I usually tighten and put a 4S and then a 3S flight in. On the post flight I found I could tighten the nut a little more so I did but then I felt less resistance. I tried to unscrew the nut but it had jammed on the aluminum collet threads. I made a slot on the end of the collet and with a screw driver was able to keep the shaft from turning while freeing the jammed nut. After the nut was removed I was able to remove the prop. I have not flown the EC 1500 since as I am waiting for collets (not Horizon/Eflite) that are bigger like the Timber, SR22 and other Eflite collet adapters. Horizon sent me some Zap Z-42 thread locker however I still do not know how much torque to apply without jamming the nut. I could measure with a torque wrench the foot pounds required to jam and damage the threads on a new collet and nut and use that for a reference or go to a different collet that has more surface area like the Timber and SR...Continue Reading
Posted by VicT | Aug 23, 2019 @ 10:46 PM | 1,829 Views
L APES (Low Altitude Parachute Extraction System ) is used by USAF C130 crews to deliver palletized cargo such as jeeps and other supplies. The EC 1500 could be configured to do the same maneuver using a 3 position switch. My DX9 3 position switch is automatically set up for ramp/door closed (position 0), ramp level (position 1) and ramp 20 degrees down ( position 2). A drogue parachute could be deployed using position 1 and could provide tension on a foam block inside the fuselage. Position 2 could release a loop of string similar to a sailplane/tow plane release system. The ramp servo or a Servo from a Y cable could pull the pin to release the loop of string.

Once the system is verified and validated other cargo could be made. A 30 foot banner could be towed and released 5 ft above the runway or 30 ft of ping pong balls tied together. The system should be as light as possible in case of an emergency such as a fouled chute or stuck cargo.
Posted by VicT | Aug 21, 2019 @ 11:44 PM | 1,902 Views
I used PVC to make a new plane holder. The X uprights fit the EC fuselage and I can run up the props where the “goalpost” uprights interfered with the props. I can store the wings, stab, and fin in the tub. A parachute cord ties the two nacelles together.
Posted by VicT | Aug 20, 2019 @ 10:57 PM | 1,617 Views
All controls were set to stock throws and settings. The elevator setting was neutral and I did not set the elevator down as shown on page 10. Takeoff was from asphalt into a 3 mph headwind using high rates with flaps up and SAFE Off. On downwind No trim was required so turned SAFE On. Tested the recommended flap settings and they worked fine with full or no power. Despite my previous concerns with asymmetric thrust there was NO Rudder required to maintain heading throughout the throttle curve. I did use more rudder for coordinated turns but found an aileron to rudder mix for scale like flying. The center section flaps really allow slow takeoffs and approaches. But with full power and full up elevator she accelerates at a 90 degree angle! At straight and level with max power I saw no aileron or roll oscillation. (On other 60 -70 mph models I’ve switched to the V900 RX to eliminate roll oscillation). With power off and full flaps and full up elevator there was no abrupt stall or tip stall. With full aileron added a gentle spiral of 3 or 4 turns was tested. Recovery is quick and easy by releasing sticks and adding power. I was having too much fun doing slow scale like touch and goes to do any extreme aerobatics and will test that out on another day.

I noticed that she does not want to slow down on landing roll out and I almost went off the runway pavement end 2 times! I could put Aerostar 60 amp RVS speed controls in for reverse thrust but I don’t want to give up the ramp/...Continue Reading
Posted by VicT | Aug 18, 2019 @ 12:20 AM | 1,915 Views
The EC1500 is the best engineered foamy I have had. The parts fit perfectly and it all works. Total time for unboxing and programming took me just over 3.5 hrs. Here are some notes:

The ESC has a blue EC5 (90 amp) connector. The Addendum recommends an adapter. I already had an adapter to convert the EC5 to an XT 90 yellow plug to mate with a 4000 65C Graphene Turnigy pack with a black XT 90 connector.

I used a blank model in the the Acro type and named it EC1500. I used an extension bind cable and used forceps to insert it into the 636 receiver port. After inserting the bind plug and plugging in the 4S pack I did not get a blinking LED on the receiver. I pushed in the connectors to the separate BEC and got a blue light on the BEC and flashing RX LED. I checked all the other plug connections to make sure they were seated correctly. I removed the bind plug and bound my DX9 TX to the RX. It bound standing 5 ft away and I could see the plastic elevator “stubs” move full up when I put the fuselage down into a dive. The ramp/door opened up and was hitting my fuselage stooge. I found out that the default switch is A. Position 1 is open and 0 is closed. So make sure your fuselage holder is clear of the ramp. I later put the Ramp/door switch on switch C (Chan 5) and set the speed to 3 seconds for 0 /up, 1 level, and 2 down. Custom voice for position 0 is “Door Closed”. Position 1 is “Door Open”. Position 2 is “Bombs Away”. NOTE: The Airforc/Coast Guard...Continue Reading
Posted by VicT | Aug 12, 2019 @ 02:26 AM | 1,921 Views
My flying buddy has a stock CA and a Walrus that he uses for thermal soaring and for full throttle aerobatic practice and experimentation. He was using a Timber X for aerobatic practice but it’s in need of major foam repairs. The CA is holding up to this type of stress with minor foam cracks and tears glued back with regular CA. He uses the CA SAFE System for “orientation recovery “.

The Walrus is about half the price and does not come with a RX so he is using an orange 5 CH RX for motor, rudder, elevator, ailerons, and flaps. The Walrus does not look like it would be a good sailplane because the fuselage is much fatter than the CA. However the Walrus is stiffer and there is less wing flexing. Walrus has a thinner wing section and with upswept wing tips has better rudder only roll coupling. The glide is faster and has better lift even without changing wing camber. The power to weight and aerobatics are better than the stock CA. The flaps offer full trailing edge camber with ailerons and can slow Walrus down unlike the CA. The Walrus prop shows stress marks and if it fails/seperates could cause a serious body injury during a power on hand launch. The Walrus would be a nice inexpensive aerobatic trainer/motor glider with the Timber X receiver in her. I'll be on the lookout for the similar looking but discontinued ELuna from Tower Hobbies.
Posted by VicT | Aug 02, 2019 @ 06:40 AM | 2,440 Views
The Valiant 1.3 Landing Gear (E-flite - Valiant 1.3 Landing gear set - 4955) can be used on other models with a little modification. I have purchased (under $15) and installed about 8 so far in Apprentices, Timbers, and Turbo Timbers. The gear comes with screws and a tailwheel that fits the Valiant. The gear might be on backorder and I had to wait a few weeks for my latest shipment. If you are looking for one of the best SAFE intermediate sport designs purchase the whole model (with the AR636 RX) as it’s my favorite plane to instruct with. It is slightly smaller, faster, and more aerobatic than the Timber but can land slow with the nice flap design.

For the Turbo Timber remove the screws that secure the stock landing gear. I put all the wheels, legs, springs and parts in a large plastic baggy. This way you can trial fit the Valiant gear into the battery bay without interference. The U shape portion of the gear is designs so that the battery can fit between the legs. I put the U shape all the way aft in the battery bay and secure it with low temp hot glue. If you need to remove the gear then use 95 percent alcohol and a small brush to break the bond. For my original Timber (that does not have the 4 carbon fiber reinforcement tubes) I made up some balsa ply sides to reinforce the foam fuselage. These sides support hardwood so the included screws can be used to remove the landing gear for float gear installation or for belly landings.

The wheel...Continue Reading
Posted by VicT | Aug 01, 2019 @ 11:32 AM | 3,043 Views
I recently got my old Radian Pro (RP) back. It was going to be converted to a Taranis TX/RX system for RSSI, Battery Voltage, Vario, and Altitude Telemetry. Eventually it will but I wanted to fly her with SAFE Self Level and so this is how I did it. The RP was flying using the DX9 Sailplane program with an old AR600 long range receiver. Flight modes and programming worked fine and I wanted to keep it but add SAFE Self Level using a new RX.

The Turbo Timber (TT) SAFE receiver was a new open stock version that Horizon programmed for the Turbo Timber. So I used a new model in my DX9, bound it (with the bind plug removed) and named it RadPro TTSafe RX. I connected the RP elevator servo to verify the old elevator servo would move and direction was correct. It was not so I reversed the elevator and with Self Level On put nose down, tail up and verified full up elevator. I then made sure that Rx Port Assignments channel 7 was on Aux 3 and that Channel Input Config Aux 3 was assigned to my B switch. The RX can turn SAFE On and Off with any channel that your TX has from 5 to 9. I then scrolled to the Monitor page to make sure that when the left and right sticks were down and in I read -100,100,-100 and -100. This was confirmed and I toggled the B switch until I saw the elevator and rudder twitch. Then I put the nose down and tail up to make sure the B switch turned SAFE on and OFF. The B0 position turns SAFE On and B1,2 turns SAFE Off.
The old AR600...Continue Reading