logo  
 
About | Contact |Postage |Payment Options | Newsletter| Terms and Conditions| Research
 

Micro F22 Raptor

stage01
A scratch built jet with a unique elevron mixing system and servo mounted control surfaces.

Specs
Receiver: DT rx36   UHU Por Glue UHU Por Glue
ESC:3AMP Micro ESC   Canopy Attachment:
3mm magnets
Motor: 7700kv Brushless     Length:
Propeller: TriTurbofan     Flying Weight: 24grams
Battery: 300mah     Airframe Weight: 16grams
Foam: Depron grey 3mm     Wingspan: 27cm
Servos: 2 x HK5320     Length: 33cm
        Length: 33cm
stage01

The major feature of this plane and my whole purpose for building it was to trial a new direct drive system for controlling the surfaces without the need for pushrods and connectors. In this system the control surfaces are attached directly to the servo arms and supported by these 0.8mm carbon rods. You can see a video of this system working at the bottom of this page.

Blu-tack was used to hold the servo arm and carbon rods in place and straight while it was glued.

Related Products
x 0.8mm Crabon rod

iamge 01


The holes in the servo arm needed to be drilled out a little but the carbon rod was a firm fit on the hole and additional strength was achieved by adding Araldite around the back where about 3mm of carbon was protruding.



Related Products
Araldite 90minute

 

iamge 01


For the ESC unit I used micro connectors which had been cut out of a 2.54mm pitch connector. Once removed, these connectors are very light and similar in some ways to bullet connectors.




Related Products

2.54mm pitch micro connectors
iamge 01


The opposite part of the connector was soldered into the DTrx36 bare board.



Related Products
DTRx36 bare board
Sanki 0.5mm solder
1 2.54mm pitch micro connectors

iamge 01


Showing the HK5320 servo. The connector has been removed and replaced with the 2.54mm pitch connector plugs which have been soldered on. The solder joint is protected and strengthened by 0.6mm heat shrink.

Related Products
HK5320 Servo

iamge 01


The same 2.54mm pitch connectors were also used for connecting the ESC unit.

Related Products
3Amp Micro ESC
iamge 01


Soldering the connectors and covering with 0.6mm heat shrink.

1 0.6mm heat shrink

iamge 01


7700kv motor attached

 

Related Products
7700kv Motor

iamge 01


Motor and ESC
iamge 01


All up weight of the electronics as shown here is 12.27 grams. However this is with a 130mah battery which I later swapped for a 300mah battery which gives a good 8 to 10 minutes flight time.
iamge 01


ESC Unit soldered and connected.

iamge 01


Receiver with all connections - motor aileron and elevator

iamge 01


The completed electrical system. This system really is quite simple with just two servos which use elevron mixing .

iamge 01


Showing the setup of the motor and servos. The motor is housed inside a plastic tube with a screw to hold it in place and the servos are glued to that same tube so the whole unit is joined and supported together. The unit is then attached to the airframe by attaching the servos with double sided tape.
iamge 01


The airframe is made from 3mm grey Depron and the plans are just a scaled down version of one of the many F22 plans freely available on the internet.

Related Products
Depron3mm grey foam

 

iamge 01


This image shows how the power and steering unit has been mounted to the airframe and how the control surfaces attach to the carbon rods.

 

iamge 01


The completed airframe

iamge 01


Small neodymium magnets were used to attach the canopy which houses the battery.

Related Products
Neodymium 3mm x 1mm magnets

 

iamge 01


The setup of the rx unit and ESC which were simply mounted by sticking them to the sides of the airframe with double sided tape.

iamge 01


Finishing touches – these are actually printable tattoos but they make for great decals and you can design your own and print them yourself.

A short video showing the power systema and elevrn mixing setup.

Bench testing the control surfaces


A short flight