VicT's blog View Details
Archive for July, 2016
Posted by VicT | Jul 15, 2016 @ 03:39 AM | 5,764 Views
Page 6 states that Slats are optional. I have not used them as I find that although they work very well to reduce stall speed the excess power can be used to reduce airspeed to zero. The slats are the hallmark of this design and are fragile. So protecting the flaps from damage is a challenge. Others have used 20 X tape to protect and instead of CA a double sided rug tape is used instead. RC posts have shown a plastic clip being developed to clip slats on and off but as of July 15, 2016 no clips are available. Some full size designs have spring or gravity loaded flaps where the slats retract when airspeed forces retract the slats flush with the wing. This would be nice for the Timber. I'm saving my slats for that someone who designs this modification. They could be controlled using the flap to retract or extend the slats. Spring loaded to the extend position for takeoff or landing flaps and pulled back flush against the leading edge when flaps are retracted.
Posted by VicT | Jul 15, 2016 @ 03:16 AM | 5,721 Views
Page 6 shows B screws being inserted from the top down. Don't insert them from bottom up!
This clevis installation is not what came with the Timber. Remove the rudder and elevator servo arms and check for binding of the pushrod wire and plastic tube. RCGroups has reported problems with binding that required sanding/cleaning of the pushrod. The bolt that secures the pushrod at the elevator servo arm is a critical part. If the bolt stops pinching the rod then the elevator is compromised and pitch control will be erratic or lost resulting in a crash. I do not recommend thread locking as this strips the screw when adjustments are needed or when pushrod needs to be pulled out or in. A better solution is to use a 1/16" wheel collar in front and aft of the metal barrel. This will prevent slippage when it occurs.

Control Surface Centering is critical for both SAFE Self Level On or Off. Mechanically center all surfaces after TX has been bound and double check by using a straight edge. On first flight takeoff with SAFE switched off. I recommend takeoff flaps with or without slats installed. Use about half throttle and what ever elevator trim needed to fly level hands off. You can trim ailerons for wings level flight. You can verify SAFE self levels at altitude by moving your selected switch but it's better for the gyros to have zero trim at the TX. So land and measure or mark what your elevator setting is. Zero out your TX trims and mechanically adjust your...Continue Reading
Posted by VicT | Jul 15, 2016 @ 02:00 AM | 5,165 Views
Page 5 shows Landing Gear Installation. The B 3.5 machine bolts are shown. Use a magnetic Philips head screw driver to keep this oddball screw from falling in the dirt or grass! I will be searching for a replacement thumb screw bolt that will be a quicker and easier way to swap my landing gear for my floats. Fastening parts E and D is a pain. I may replace this bracket assembly by wrapping wire or an O ring. This will spread the wheels apart slightly for a wider wheel track. It will also lower the center of gravity a little. These two mods may minimize Timbers tipping over during low speed turning on grass. After tipping and dragging a wing tip the Timber noses over and comes to rest nose down. This is a hassle as you have to walk to the model on the runway to right itself tail down. I have tried putting a 3200 3S pack as far aft in the battery compartment but this does not remedy. I may make up 1" long axle extenders to reduce nose overs. See sketch.
Posted by VicT | Jul 14, 2016 @ 11:28 PM | 4,883 Views
Be careful unwrapping the Timber parts. The slats are fragile and wrapped in foam. Be careful as the slats are the hallmark of this model. Use a sharp box cutter or scissors to cut the tape from the foam. RC groups has reports of small dents and smudge marks. If excessive then the box can be used to ship back for a total replacement. The screw and bolt package is small and can be hard to find. Don't accidently throw it away with scrap foam. Horizon is great for free replacements. My student crashed his Apprentice and I shipped back her back for troubleshooting. They could not find anything wrong but shipped a new Apprentice back! On bottom of page 3 of the manual there is a registration request. This might help if and when you want a total replacement.

On top left of pg 3 there are metric travel throws but on page 4 the 100 and 70% rates work good for me. The low rates make me look real smooth and the high rates make me look jerky. Pick your rates after a few flights.

Page 6 of manual shows a clevis system that is not included. It's a better system than the screw system on top of the elevator and rudder system. I removed the the servo arm and checked for no binding and no slop in each flight control and my 10 flights have been good so far. Time will tell. I've only had to mechanically move the
Elevator up 1/8" to zero out the 20 clicks of transmitter trim.

On page 4 expo is discussed. I have set 40% for all controls and like this setting. The computerized transmitter setup worked perfectly for my DX9.

On page 5 there are four fine threaded 3.5 mm bolts to hold the landing gear struts to the aluminum strut "pockets. The remainder of the fasteners are sheet metal type screws. There is no size chart or directions. There are 4 screws that are used. Two of the G screws are for the suspension and the remaining 2 G screws are used for the float assembly instructions on page 8. Here are some close ups of the G screws for the floats.
Posted by VicT | Jul 14, 2016 @ 10:15 PM | 4,727 Views
When you get the big brown box on your door step inspect for crush marks. If purchased at a store unpack the contents at home because there is a lot of foam to collect and save. Open up the ends of the box and push the inner box out. Use a box cutter to cut one long 50" edge open. This is easier to get the foam "tray" out of the colored cardboard box. The foam tray has top and bottom cardboard covers to save.
Posted by VicT | Jul 08, 2016 @ 02:27 PM | 4,991 Views
I've modified the Apprentice S and Toledo Special so that the lipo pack can be loaded and unloaded using a door on top of the fuselage. This makes it easier so you don't have to put the model upside down on the ground, lap, beach, grass, or plane holder.

In the Timber the bottom door and compartment is big enough for the stock 3S 2200 and I have 3 flights using the EFlight 3200 3S as used in the Apprentice. It's tight but it works. The speed control is in its own compartment between the battery floor and the cowl. It is not secured and there is no access to it for checking or repair/replacement. I have a Turnigy 40 amp ESC that uses an extra channel so that the prop can turn backwards. This will come in handy when the Timber floatplane is beached or gets stuck. Just throw a switch and use throttle to back out! So this mod allows a seperate ESC compartment since it uses the original battery compartment.

I did not know where to start since I had no crashed fuselage to cut in two pieces. So cross sections were seen on RC groups with crash damage to others. Some were reporting that the nose area was weak and that the foam nose was not holding up to propellor loads. So the modification adds a balsa structure that when CA glued to the foam adds much strength. The U shaped structure also carries the battery weight and carries it to the balsa structure. The battery floor is slightly angled so that on impact the battery will be ejected through the door so as to minimize crash forces of a trapped battery. The structure also takes bending loads when the Timber has a full stall or dropped in landing.