Prime Tundra Plug N Fly Instruction Manual

Using Flaps.

When you feel you are ready, the time will come when you want to use the flaps. Using flaps is great

fun and a big feature of the Tundra series of models. Flaps help shorten the take-off and landing,

enable the model to fly slower, and will help you make steeper approaches to land. As with the dual

rates, you need to build up slowly to using the flaps. Once again, after you have taken off with the gyro

in training mode, and are settled in with generally flying about you are ready to give the flaps ago.

Before you select the flaps, make sure you are at 50% throttle or less, then move the flap switch to the

middle (half flap) position. The nose will pitch up slightly, the slower the model is flying, the less this

will happen, don't worry too much about this pitching up, the gyro will very quickly correct this for you.

However, it may be necessary to retrim the elevator slightly at this point to retain level flight.

Once the model has settled down it should be flying a bit slower, now get used to flying it around in

this configuration. If you feel comfortable, then try some dummy approaches to land and some slow

flypasts over the take-off area. When you want to move the flaps back to the up position, only do this

at a reasonable height. The reason being is that once you select flaps up, the nose will go down and

the speed will increase slightly, the gyro will compensate once again but you do not want to be too low

when doing this. Once again you may need to retrim the elevator as necessary to achieve level flight.

So when you feel ready, try a take-off using half flap, this is with the flap switch in the middle position

on the transmitter. You will notice that it takes off in a much shorter distance, and also gains height

over a shorter distance. This is perfect when you are able to fly at smaller sites that have bushes etc

you may need to climb over. Then try a circuit and landing using half flap, you will be able to fly a

slightly tighter circuit, and will have a slighter steeper, slower final approach. You will notice that you

will need a little more power due to the extra drag and increase in lift from the flaps.

After several flights, and once you are really used to flying with half flaps set, the time comes to try full

flap with the switch in the fully down position. Once again, get used to flying on full flap at a safe height

until you feel ready to try a final approach. We don't recommend using full flap for take-off, it is not

necessary, half flaps is more than enough. Full flap gives you nearly all drag and very little extra lift,

hence why we do not recommend it for take-off, only in the circuit and for landing.

Do not switch into full flap in one hit, select half flap, wait a second for the model to settle and the gyro

to compensate, then select full flap. Straightaway you will notice it is a bit like putting a handbrake on,

you will see the model slow up and you will need a bit more power to overcome the drag, retrim the

elevator as necessary. Once again, get used to flying with the model in this configuration, keep the

turns gentle, and use the throttle as necessary.

Now try some dummy circuits and approaches, be a bit higher than normal, select half flap for the

downwind leg, base leg, and onto the final approach, once established on final approach select full

flap. Straightaway you will see that the final approach angle is much steeper (great for flying over an

obstacle on the approach) be ready to control the descent with throttle and the airspeed with the

elevator.

DURAFLY PRIME TUNDRA 1200MM

PLUG AND FLY VERSION