Mount the aileron control horns with the inside edge of the horn 2-1/4" (57mm) out from the inner end of the aileron on a line perpendicular to the leading edge of the aileron. The front of the base plate should be 3/16" (4.8mm) back from the leading edge of the aileron.


Trace around the base plate and remove the covering under the base plate. Mark the two holes for the screws and drill two pilot holes with a 3/64" (1.2mm) bit almost through the aileron. Using 5-minute epoxy or medium CA glue, glue the control horn to the wood and secure it with two #2 x7/16" sheet metal screws that have 3/32" (2mm) of the point filed off.


Hinge the ailerons to the wing using three SIG Easy Hinges for each aileron, as shown on the plans.


Plug an aileron servo into a pre-installed servo extension, tape or heat shrink the plugs together and feed this back down the paper tube to the hole in the center of the wing before screwing the servo into its mount. Repeat on the other wing. Connect the two leads together in the center with a short y-harness, then plug into the aileron socket of the receiver. Turn on your transmitter and receiver and center these servos before installing the servo arms pointing towards the center of the wing.


Bend two pushrods 2-13/16" (20.6mm) long from the pin of the r/c link to the Z-bend when the link is centered on the threads. Install the pushrods Z-bends in the center hole of the servo arms, the r/c link pin in the end hole of the control horn, check to make sure the ailerons move the right way and adjust for neutral.


Install the motors on the mounts and the mounts on the firewalls and wire them up as required.

With brushless motors a speed control is needed for each motor. To keep the wires between the ESCís and the motors as short as possible, mount the ESCís out in the nacelles behind the motors. This also provides them with adequate cooling air. The servo extensions for the speed controls should already be available at the nacelles and they can be Y-harnessed together in the center of the wing. Check each motor for proper rotation before installing the cowls and props.


Secure the receiver in the compartment behind the servos. Stick on Velcroģ works great for this task.


Install the rudder and elevator servos in the fuselage where shown, plug them into the receiver, and center them with the radio. Connect the push rods to the servos using the pushrod connectors in the inner hole of the servo arm.
When connecting the rudder pushrod, tighten the connector in the center of the available pushrod travel. Use the 4-40 headless setscrews to clamp the wire in the connectors.


Fabricate the two rudder control horns from 1/8" (3.2 mm) dowel or 1/8"x3/16" (3.2x4.7mm) spruce and install the pushrod connectors as shown making a right and a left horn.

Clamp the rudders in neutral and center the rudder servo. Slide the right side connector onto the right rudder pushrod and move the assembly down to contact the rudder.

Note where the arm contacts the rudder, remove the covering from this spot, then securely glue the horn to the rudder and form a slight glue fillet around this joint.


Repeat on the left side. Tighten the setscrews on the connectors, remove the clamps holding the rudders, and then check for proper throw direction and travel. These rudders are very effective so not much travel is needed.


Because you will be connecting three different plugs whenever you mount the wing, itís a good idea to use small tape labels on the mating pairs for easy identification. Color electricians tape works great for this purpose.

Decal Application

The decals supplied with your Do 217 kit are high quality Mylarģ with an extremely aggressive adhesive. These are not die cut and must be removed from the sheet using a hobby knife and/or a sharp #11 blade or a sharp pair of scissors. We suggest the following method to accurately apply the larger decals in this kit.
  • Carefully cut out the decal and lift it off the sheet with tweezers.
  • Use a product like SIG Pure Magic Model Airplane Cleaner or Windexģ to spray the area of the model that will receive the decal. Then spray the adhesive side of the decal as well.
  • Lightly position the decal in place on the model. The liquid cleaner allows the decal to slide easily into the desired position as long as you don't press down on it.
  • Once you have it in position, hold the decal lightly in place with your fingertips and use a paper towel to gently dab away the excess liquid.
  • Use a small squeegee to now set the decal in place, removing all excess liquid and any trapped air bubbles from beneath the decal. The SIG 4" Epoxy Spreader (SIGSH678) is ideal for the job.
  • Remove any excess fluid with a paper towel and allow the decals to set overnight. They will be solidly adhered to the model without any air bubbles.

Option Safety Tip

For safety and convenience we like to install a master switch in the battery harness between the drive batteries and the ESC's. This must be accessible from the outside of the airplane to be effective.

Control Throws

Mount the wing to the fuselage with all connectors plugged into the receiver and battery harness. Check to make sure all wiring is inside the fuselage and not caught between the wing and fuselage saddle. Install the battery pack in itís compartment in the nose and turn the system on and verify that everything moves the proper direction and the control throws are within the suggested range.

Ailerons3/8" (9.5mm) Up and Down
Elevator1/4" (6.4mm) Up and Down
Rudders1/4" (6.4mm) Left and Right

Center Of Gravity

With the wing installed and the battery in place, the center of gravity should be checked and adjusted as required. The airplane should balance 2-3/4" to 3" (70 to 76.2mm) behind the leading edge of the wing at the root.


The SIG Do 217 is actually quite easy to fly, provided you've had previous experience and success in flying R/C models in the past. This model is not recommended as an R/C trainer. If this is your first R/C model aircraft, we urge you to seek out and use an experienced R/C pilot to pre-flight, test fly, and flight-trim the model for you. The Do 217 is very stable and provides excellent control response. If your model was built without landing gear, you will, of course, have to hand-launch it. The very best conditions for your first test flights would be with no wind, such as in the morning or evening. Not having to deal with windy conditions allows you to properly observe and trim your model without undue influence from winds. Properly powered, the Do 217 is certainly capable of flying in moderate winds without issue. But for the first trim flights of this or any model, we always suggest choosing a day with little or no wind.


Before making the first test flight, take the time to make sure each of the flight control surfaces are moving in the correct directions and are properly centered. Once you're certain that they are, check these controls, once again. Next, holding the model securely, throttle-up the motors to make sure they're reaching full power and sound in "synch". The propellers should be balanced and free of dings and nicks - never fly your model with propellers that are damaged in any way! Finally, we strongly suggest that you perform a range check of your radio system using the range test criteria spelled out in the instructions that came with your particular radio system.
With everything now checked, double-checked, and working properly, you should be ready to commit to flight. With one hand, hold the model by its belly, just below the wing saddle, while holding your transmitter in your other hand. Face directly into the prevailing wind direction and advance the throttle stick to approximately 2/3ís power. Take a few brisk steps forward and launch the model straight ahead, giving it plenty of flying speed, while keeping the wings level and the nose pointed directly at the horizon. Never launch the model with the nose up or with one wing lower than the other!

Doing this has the potential of inducing a stall condition that, in turn, could cause the airplane to crash due to lack of airspeed. If, for whatever reason, you feel that you cannot make a successful hand launch by yourself, ask a flying buddy to launch the airplane for you. Just be sure that he completely understands what you want him to do - wings level, nose pointed at the horizon, and a good hard launch.

The airplane should smoothly leave your hand launch and fly quickly away in a slight climb. Add a little more power and continue flying the airplane directly upwind while gaining speed and altitude. Once the model is at a reasonable trimming altitude, begin the trimming process, with the transmitter trims to achieve straight and level flight at about the 2/3ís throttle setting. Once the model is trimmed to your satisfaction, you can begin to explore itís flight envelope.

One of the first things that we always like to check out on any new model is the stall characteristic. At altitude, hold the model in a level upwind heading and begin throttling back the motors, while gradually adding up elevator input to maintain altitude. The goal here is to observe what the model does when it becomes fully stalled and to also learn the approximate speed and attitude it's in when the stall occurs. Our prototype Do 217 models demonstrated fairly clean stalls, with the nose dropping forward and controlled flight resuming shortly thereafter. This is very good information to have when it comes time to set-up the landing.

We have found with our Do 217 prototypes that the roll authority is quite good using the suggested aileron movements in this manual. With practice, the rolls can be made almost axial with judicious elevator input. But the type of roll that we really prefer with this model is the more rounded "military" type roll - these just look great!

If your own Do 217 is powered with the brushless motors suggested in this manual, it should have plenty of power. This means that loops can be made from level flight and can actually be quite large. Also, despite the relatively small amount of available rudder throw, the Do 217 can also make some impressive flat turns. We have also induced our prototypes into some very nice looking spins and have had no problem at all, stopping the spin exactly when we wanted to by neutralizing the controls.

You should also find that your Do 217 model will fly inverted very comfortably, but will likely require some down elevator input to maintain level flight. We have even done outside loops with our prototypes and even though these are far from being prototypical to the full-size aircraft, they do look very cool.

In all of this, there is one maneuver that you will probably never get tired of, and that is the long, low fly-bys. Man, does this airplane ever look the part when flown in high or low-speed, low-level passes!


Landing the Do 217 is almost a non-event. Assuming, of course, that you're flying off of a grass field, the set-up for a landing approach is no different than any other model. Pick a point on the field where you want to touch down and fly the airplane down to that point, slowing it up by throttling back. Like any other landing approach, start with the downwind leg, followed by the base turn and last, the turn to the final upwind landing approach to your runway. This sequence is ideally flown with the model gradually descending to final touchdown with the wings level. Just before touchdown, the throttle stick should be fully off with no power to the motors and the airplane will slide cleanly to stop.

After the first test flight, review the transmitter trim inputs and adjust the flying surface linkages accordingly. Then return the transmitter flight trims to their neutral settings. You may have to do this a couple of times until the airplane is completely "dialed-in" to your liking. Also, after each flight, make it a habit to inspect the airplane completely - inside and out - for anything that may have come loose, may have broken, etc. This simple practice will keep your Do 217 on the ready line for a long time to come.

We sincerely hope that you have enjoyed building and flying your new SIG Do 217 model. We also hope that you will continue to fly it safely for a long time to come, with respect for other people and property.

Good luck and safe flying!

SIG Manufacturing is completely committed to your success with this model. If, for any reason you should encounter any problems with the parts or materials used in this kit, be sure to contact SIG.

Warning! This is not a toy!
Flying machines of any form, either model-size or full-size, are not toys! Because of the speeds that airplanes must achieve in order to fly, they are capable of causing serious bodily harm and property damage if they crash. IT IS YOUR RESPONSIBILITY AND YOURS ALONE to assemble this model airplane correctly according to the plans and instructions, to ground test the finished model before each flight to make sure it is completely airworthy, and to always fly your model in a safe location and in a safe manner. The first test flights should only be made by an experienced R/C flyer, familiar with high performance R/C aircraft.
The governing body for radio-control model airplanes in the United States is the ACADEMY OF MODEL AERONAUTICS, commonly called the AMA. The AMA SAFETY CODE provides guidelines for the safe operation of R/C model airplanes. While AMA membership is not necessarily mandatory, it is required by most R/C flying clubs in the U.S. and provides you with important liability insurance in case your R/C model should ever cause serious property damage or personal injury to someone else. For more information, contact:
Telephone: (765) 287-1256
5161 East Memorial Drive
Muncie, IN 47302

SIG MFG. CO., INC. is totally committed to your success in both assembling and flying the Dornier Do 217 kit. Should you encounter any problem building this kit or discover any missing or damaged parts, please feel free to contact us by mail or telephone.

401-7 South Front Street
Montezuma, IA 50171-0520
SIG MODELER S ORDERLINE: (to order parts)1-800-247-5008
SIG MODELER S HOTLINE (for technical support)1-641-623-0215

© Copyright SIG Mfg. Co., Inc.

SIG MFG. CO., INC............Montezuma, Iowa 50171-0520

LIMIT OF LIABILITY: The craftsmanship, attention to detail and actions of the builder/flyer of this model airplane kit will ultimately determine the airworthiness, flight performance and safety of the finished model. SIG MFG. CO's obligation shall be to replace those parts of the kit proven to be defective or missing. The user shall determine the suitability of the product for his or her intended use and shall assume all risk and liability in connection therewith.