VicT's blog View Details
Posted by VicT | Jul 08, 2019 @ 11:48 PM | 3,211 Views
I have a blog for a top battery door for the original Timber but this is for the Turbo Timber. It might work for the original Timber but you are on your own.

Ive had no structural problems with this TT mod. Ive had about 100 flights and with no crashes it has held up. If you crash or damage the model in any way the whole aircraft must be inspected and fixed before the next flight. In my experience most flyers and especially beginners try and fly with a damaged model without fixing the crash damage. Then they blame their crashes on the models design. Enough Soap Box. Read on if you want,
The TT has 4 carbon fiber tubes that connect the motor mount to the main cabin area. The surrounding foam supports the tubes and acts as a wind fairing. By cutting away the top surface of the fairing the tubes are not compromised.
The top cowl and windshield are cut away with a new small size box cutter. Remove the ESC and any light wires to eliminate accidentally cutting those wires. See pics
Posted by VicT | Jun 22, 2019 @ 12:51 AM | 3,551 Views
Retracts have been well worn and work good on plane stand but on takeoff they dont retract all the way into the wheel wells. I am using 4S and amps are under ESC limit. I replaced old retracts with new ones (stock) to see if this solves the problem.
The old retract was taken apart for inspection and to see how they work. See pics

Today the maiden with new retracts went great. The wheels go all the way up to the worm gear stops and the tires are flush with the underside of the wing!
Posted by VicT | Jun 20, 2019 @ 10:24 PM | 2,885 Views
Takeoff was with Self Level Off so I could set trim. After trimming for hands off flight for 3 or 4 seconds Self Level was turned on. Roll and pitch limits were verified as well as hands off level flight with all flap settings. A full flap landing with partial power was completed. On the bench Self Level was turned off, the elevator marked on the fuse and TX trim returned to neutral. Then the elevator clevis was adjusted to bring the elevator back to match the mark on the fuselage.
I exported the settings to Dales SD card then imported the file to his DX9 TX. Wireless buddy box fam training will be next.
Posted by VicT | Jun 20, 2019 @ 03:10 PM | 2,504 Views
Having the V900 receiver installed in my AT6 Texan with flaps and retracts I figured it would work as well in the T-28. Today confirmed my hopes. I had to move the elevator servo arm 180 degrees and move the servo to the side to relieve push rod stress and I added a servo reverser to the aileron Y channel. However I did not have to reprogram the receiver using the Windows software and program cable. The receiver was purchased as an open stock and Horizon at my request put in the V900 settings before shipping it to me. The old receiver can be used for other purposes.

First step was to pry the stock 636 RX out of the foam fuselage and to remove the white rubber glue using forceps. Then servo plugs were removed and placed in the new V900 RX one at a time. Most of the plugs had ID tags on them. If yours does not have tags I recommend using painters tape (I like yellow) and then mark them with a black Sharpie marker. I added a short aileron extension to the bind port as its easier to insert and remove a bind plug that way. I used 3M Dual Lock to secure the RX to the white foam RX area. Inserting a small tool (piece of credit card) can easily pry the Dual Lock apart in case the RX has to be taken out for another plane.

I had previously bound the RX to a new ACRO model and got the B switch to turn Self Level on and off. I then rebound the receiver to the old T-28 Non Safe settings and the B switch worked to turn Self Level on and off. After binding the elevator was reversed as well as the aileron. Rudder worked. I could have reversed the RX 180 degrees and possibly have only one flight control to reverse but I proceeded with the old fashion way of rotating the elevator servo arm 180 degrees. At this time I also swapped out the white nylon clevis with the weak pin for Dubros new black nylon clevis with the larger pin. I had to drill out the elevator horn to match the .063 inch O.D.
To be continued
Posted by VicT | Jun 01, 2019 @ 11:01 PM | 768 Views
Spektrum technical recommends:

1. Start with a new model and not an existing model.
2. Bind it with the bind plug removed. Make sure receiver is blinking when you bind.
3. In System Setup Channel Assign assign a switch to turn SAFE on or off. Any switch can be used between channel 5-9. The gear channel is 5. If the gear is used for retracts then use channel 6 to activate switch B. I like to use Switch B because its the easiest to toggle on and off with the left forefinger pad. The middle position (1) can be set to On or Off.
4. Move both sticks to lower inside position. In the monitor screen make sure throttle, aileron, elevator, and rudder are showing plus or minus 100 percent.
5. Toggle switch B between stops (0 and 2) until you see a twitch in the elevator. Stop toggling when you see this and confirm the switch works by holding the model nose down and tail up. SAFE On should give you up elevator. Turning it off should give you neutral elevator. Put model into a bank. The upper wing aileron should raise trying to level the wing. If you dont get this re toggle the switch again.
6 Once the switch is working you can name the model, select wing type (flaps), throttle, cut, rate switches, mix switches, and audio.
7. On first flight turn SAFE Off and trim the model at what ever minimum power is to maintain altitude (roughly 50 percent throttle) then land. If FM (flight modes) are used then trim for each flight mode such flaps up,...Continue Reading
Posted by VicT | May 23, 2019 @ 05:56 PM | 2,318 Views
I purchased a spare cowl and made a ply firewall to fit a 55 mm O.D. Aluminum Turbo Spinner. A yoke and collet matches it and holds 10x6 folding blades. A bungee ensures positive blade retraction. Extension is symmetrical avoiding start up imbalance loads. Heat damage from the sun warped the black painted plastic and it was removed and replaced with clear .012 inch thick plastic from a pastry container. Canopy glue was used to glue the clear to the white plastic and for screening over the turbine duct openings.

Dive performance with power off is increased due to reduction in prop drag. With a 4S 1500 100C pack amp draw is only 33 amps with 470 Watts of power. On a 20 second full power climb at 80 degrees (SAFE selected On) she climbed to an estimated 1000 ft and after trimming for a 200 ft left hand circle stayed at altitude for 10 minutes power off!

An ISDT BC 8-S shows battery remaining in percentage and in voltage. It can be viewed while running up the motor while straddling the fuselage from behind the prop.
Posted by VicT | May 13, 2019 @ 05:03 PM | 868 Views
Here is a video of a Twin Mustang in the Test stand. Purpose: to check for unwanted yaw and differential throttle (desired yaw)
Posted by VicT | May 12, 2019 @ 11:52 PM | 968 Views
I researched the Avios SkyMule thread to look for diff throttle programs and found Oxotniks program that reduces the inside motor.

Here is a copy of his post:

I also added throttle curves for both motors. Max Thrust is still available but most of the throttle will be from 3 4 stick position to 0.

I also added throttle cut to both motors using a mix.
Posted by VicT | Apr 30, 2019 @ 04:57 PM | 1,612 Views
Fellow clubmember Cliff started flying an Apprentice and then a Commander. He asked me if I could reduce the pitch up of the Apprentice at full power to a lower climb angle like his Commander. I showed him Flight Modes that could be used with his DX6 but he was unsure of that route. So I suggested reducing the decalage angle by shimming the trailing edge of the wing. I had some hard 3/32 inch thick balsa so started with one, then two and finally 3 layers of wood. The end result was a 5 degree climbout angle at full power with SAFE on (Beginner Mode). With full up elevator she climbed at about 80 degrees. Happy with 9/32 of shim we filled in the gap with a single piece of 3/32 and white electrical tape.
Posted by VicT | Apr 16, 2019 @ 10:48 PM | 1,925 Views
Today was a perfect weather day that started out (April 16, 2019) with cool temps (60F) but warmed up to about 75 by noon. Winds diminished to about 5 mph and no clouds. Lift was light but just enough for the Heron. I used the Lithium Ion (LiIO) charge setting on my $110 Hitech Black 2 pack charger. This puts about 90 percent into the Lipo 2200 3S 45 C pack and does not over charge the pack. On the first flight I flew for about 25 minutes using about 1.5 minutes of full power climbs. I only go full throttle for about 15 seconds each so this was about 4 or 5 climbs. After landing I had 55% remaining on the pack. I adjusted one flap and launched again into light but steady lift every where. After climbing to about 1000 feet and turning off SAFE Self Level I did about 1 minute of aerobatics with aileron rolls and loops. Max dive speed with SAFE on is limited to about 60-70 mph because the gyros limit dive angle to about 40 degrees. No wing flutter or flex was observed from the foam wings with aluminum wing spars. Energy retention is not like heavier fiberglass designs but is fun anyway. The full flaps and crow with full down elevator stick provides a nice 40 degree slow dive to a round out and flare right in front of you. The single wheel protects the belly and allows for friction free rollouts that are about 30 feet long . There is not friction on the wheel but if it had then this could provide for less rollout distance.

I am still learning...Continue Reading
Posted by VicT | Apr 05, 2019 @ 06:45 AM | 1,758 Views
Originally Posted by Mark 2
Well Ive pulled the trigger, so mine is on the way.
Im thinking about using the 6ch Spektrum antennaless receiver, do you guys think that would work OK in this plane? Only thing Im worried about is the size of the battery possibly blanking the receiver at some angles.

It should work but I recommend an AR636 SAFE Select Receiver. It does not have signal strength telemetry like the antennaless receivers or the Taranis/Frysky systems. You already have a DX 6-9 transmitter right?

See my blog on why Im using the AR636 wing leveling feature to minimize prop and wing surface contact. Will post flight test results in about 2 weeks using the V900 636 receiver.
Posted by VicT | Apr 05, 2019 @ 06:31 AM | 1,833 Views
Originally Posted by Mark 2
Well Ive pulled the trigger, so mine is on the way.
Im thinking about using the 6ch Spektrum antennaless receiver, do you guys think that would work OK in this plane? Only thing Im worried about is the size of the battery possibly blanking the receiver at some angles.

If you dont want to have the benefits of a SAFE receiver then yes. I have the 4ch antennaless receiver in a DHLG 60 inch glider that has carbon fiber imbedded in the Kevlar fuselage. Its a 8.9 ounce David Forbes Vixen that I dont want to lose. The nice feature of the 4 and 6 ch design is that your DX transmitter shows signal strength in various aircraft positions where battery and metal, and carbon can interfere. To verify and validate adequate signal strength this I had another pilot point the CF fuselage and tail at me about 1000 ft away. I could barely see the rudder and elevator move but we had cell phone speaker comms open to coordinate the test. I found no low signal strength values at my DX9 telemetry screen and flaperons, and rudder and elevator worked perfectly. The nice feature of this new design is that you could use 3M Dual Lock (not flexible velcro) to mount the RX in the wing to test signal strength. When testing is completed you would have less connections at the wing and fuselage.

I like to have gyro technology level my wings on crosswind landings and takeoffs. This will...Continue Reading
Posted by VicT | Mar 29, 2019 @ 10:36 PM | 2,038 Views
This applies to Turbo Timber and any other design that uses foam or some other type of material for flight control hinges.

A hinge that gets loose on any flight control surface will cause erratic control in flight. If the hinge fails and the flight control departs the model then a crash is most likely especially if it is the elevator.

My Turbo Timber showed failure of the plastic elevator hinge. It was easy to see when I removed the stab/elevator for maintenance. The elevator was easy to move up and down as viewed on its edge. Many use the same center mounted nylon hinge with or without a metal hinge pin to fix a loose hinge but there is a better method that originated back in the 40s and 50s and is a variant of the thread and needle used way back then. Its called Tyvek paper hinges.

I use the Tyvek paper that is used on mailing envelopes. I lightly sand both sides with 220-320 grit sanding paper and cut to size. Using regular (not foam safe) CA I glue the hinges to the top and bottom of the elevator and stab. I use Monocote plastic backing to push the paper and glue on to the sanded foam and this prevents the CA from sticking to my fingers. You can paint the white paper or protect it with tape.
Posted by VicT | Mar 14, 2019 @ 01:38 AM | 2,983 Views
As an experiment I want to see how the TT would perform as a motorglider but still retain the sportplane qualities. I removed the stock landing gear and installed the Valiant 1.2 gear which saves about .7 oz but is about half the area drag. I installed the Aerostar 60 amp ESC and activated the prop brake. With 10/6 folding blades on a 55 mm B+B aluminum spinner and 2200 4S she pulls 33 amps and 470 watts. She pulls very strongly.

The flight test was successful and I am pleased with the performance of the folding prop and Valiant landing gear. There is enough thrust on the smaller prop to maintain full up elevator (in SAFE Self Level) and climb at a near vertical pitch angle. At 200-400 ft with the motor stopped and flaps retracted she has a much better L/D glide ratio. Driftdown times are increased so that with 2:42 minutes of power used there was a 9:21 flight. There was 45 percent remaining on the 3200 4S 40C Kinexsis lipo pack so total flight time can be extended. However the style of flying is different than most flyers in my club.

The motor glider uses the motor to climb and glide. The glide can be slow or fast depending upon thermal and lift activity. On my test flight it was around sunset so wind and lift was scarce. However on sunny days between 10-2 lift is usually enough to maintain altitude and depending upon wing loading increase or climb. Ill be comparing her to more dedicated foamy motor gliders like my Conscendo, Calypso, Radian...Continue Reading
Posted by VicT | Mar 07, 2019 @ 10:27 PM | 2,672 Views
Ive flown my Turbo Timber with 3S 2200 45C Admirals, 1500 4S CHNL 100 C cells and Turnigy Graphene 2200 75 C 4S cells. The performance on 4S is the most desirable but endurance is not as good as 3S. The Graphene was tested and started out at 90 percent charged. Flying consisted of 5 max power climbs to 300 ft. 5 inside loops. 15 aileron rolls and 5 takeoffs and landings. This took a little less than 5 minutes using the DX9 power on timer. Total flight time was about 7 minutes because of power off glide times. Capacity of the Graphene 4S pack started out at 90 percent and at the end of 5 minutes was measured at 31 percent remaining. So 90-31= 59 Percent in 5 minutes or 59/5=11.8 percent/minute. If flying were to stop at 15 percent remaining then a total of 90-15= 75 percent would be used. This would take about 75 %/ 11.8 %/min X = 6.35 minutes. A 3200 4S 40 C pack has been recommended by Horizon and will be tested for similar endurance time.
Posted by VicT | Mar 07, 2019 @ 07:37 PM | 2,647 Views
All dimensions in millimeters.
Posted by VicT | Mar 05, 2019 @ 10:11 PM | 2,854 Views
The 60 amp Aerostar has advantages over the stock Turbo Timber Eflite 50 amp ESC:
1. With an extra channel you can reverse the rotation of the motor/prop for reverse thrust during surface operations.
2. The brake can be programmed on to stop the prop from windmilling. This reduces drag but also allows the ESC to go into reverse. I have not been able to turn the brake on for the stock Eflite 50 amp ESC
3. The ESC is rated for 60 amps which might be needed for 4S and larger props

The Aerostar has two leads. The 3 wire lead gets plugged into the throttle channel 1 for the AR636 that came with my Turbo Timber (TT). The second lead gets plugged into channel 5 (gear channel) and switch C is programmed to say Forward thrust for position C0 and 1 and Reverse Thrust for position C2. I use F0,1,2 for low to high rates and expo. The flaps are on channel 6 (Aux 1) and SAFE Self Level is on Aux 2 or channel 6. Using the Digital Switch Setup I have programmed position B0 and 1 as Self Level On and B2 as Off. Switch C0 and C1 are programmed for forward thrust and C2 as reverse thrust. I have not programmed in any Flight Modes but may after a few test and trim flights....Continue Reading
Posted by VicT | Mar 04, 2019 @ 01:40 PM | 3,114 Views
Weather not too good now so made up some nice to have mods for SST. Based on experience with regular Timber.

For picking up the loaded model Ive installed a retractable handle. It can be used to hoist the float plane in and out of the water/weeds/docking area. Also for hanging from the ceiling. Coat hanger and bends or wheel collars.

The folding wing storage and transport mod has been around since Orville folded his bicycle for Wilbah! Use an old necktie or parachute cord and bungee to keep the wings against and on top of the fuse. Be careful that the anti collision red strobe lense does not dent the trailing edge flaps. The Ace hardware folding step stool can be used to sit butt, stand on or invert SST for feeding Lipos to the belly.
Posted by VicT | Mar 04, 2019 @ 07:36 AM | 3,031 Views
Stock rudder linkage throws are good enough for 180 turn arounds. Nose lights are nice and bright! Here is a short video.