| Item | Image | Description |
Approx Cost (£) |
Available From * |
|
Kit
|
 |
2.6m Yak-55SP Kit | £999.00 |
www.composite-arf.com
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|
Engine
|
 |
There can only really be one choice here and it has to be the Desert Aircraft DA-100. Reasons for using this engine in your Comp-ARF Yak include supreme reliability, a proven history, sheer power and the fact that the airframe was designed around this engine. There are obviously other 100cc engines available but you will need to make you own modifications regarding carb placement, throttle servo placement and will probably need to jiggle with other components to obtain the recommended CofG position.
|
£805.00 |
www.alshobbies.com
|
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Spinner
|
 |
4.5" or 5" Carbon Spinner.
Although quite expensive, a carbon spinner is
recommended to help keep the weight down. To give you an idea, a
4.5” spinner (which looks ‘right’ for this model) weighs 2.9oz
whilst a quality aluminium spinner of the same size weighs 6oz.
|
£85.00 | www.alshobbies.com |
|
Propeller
|
 |
For good power, stiffness and response, the all
carbon Mejzlik 28”x10” prop is currently the preferred option for
the DA-100. If your field is more noise sensitive then a 26”x12” or
a 25”x12” 3-blade prop works very well but will be ever so slightly
down on power
|
£52.00 | www.alshobbies.com |
|
Headers
|
|
Many pilots in the US use the standard ‘dustbin’
silencers on their DA-100s however, in the much more noise sensitive
UK where the fate of your flying field often lies in engine noise it
would be nice to keep your DA-100 as quiet as possible whilst
squeezing a little more power out of it if possible!! Fortunately,
this can be achieved through the fitment of canister mufflers.
Composite-ARF supply, as an option, a set of MTW headers and
mufflers that will fit your 2.6m Yak taking all the headaches and
guesswork out of the installation!!
|
£215.00 |
www.composite-arf.com
|
|
FiberOptic Kill Switch
|
 |
This is certainly a one of the best items to fit to
your Yak to ensure maximum safety for you and others. Should your
throttle servo or linkage fail for whatever reason this unit will
allow you to kill the engine with a flick of a switch – no more
flying round until you run out of fuel or chasing a dangerous run
away model. The unit will also not allow the engine to start without
a signal from the TX and also features a manual switch to kill the
engine as yet another safety feature. Using fiber optic technology
also mean no chance of RF interference. Very highly recommended!!
|
£55.00 | Contact me for more information regarding the supply of this unit at info@composite-arf.co.uk |
|
Ignition Battery
|
 |
Can use a standard 4.8v - 6.0v (minimum of 1000mAh) receiver pack. | £14.00 | www.alshobbies.com |
|
Fuel Tank
|
 |
We recommend a 32oz Dubro tank - this will give a
good 15min flight time (using a mixture of throttle settings) on a
DA-100 with enough fuel spare for a few landing attempts!
|
£7.00 | www.alshobbies.com |
|
Fuel Filler
|
 |
This is a real luxury but for the ultimate in fuel fillers fit a
3W filler. Better than sticking a bolt in the end of
your tank filling pipe!!!!
|
£25.00 | www.alshobbies.com |
| Wheels |
 |
Very easy to gloss over but by using the Kavan 5”
wheels you can save a huge amount of weight! They are incredibly
light at 6oz per pair - compare this with 5” Sullivan
wheels at 20oz per pair and you could easily be saving
nigh on 1lb in weight!!! The only down side is they are not very
durable on tarmac runways. If you want to ensure longevity on tarmac
then I would suggest 5" Dubro wheels.
|
£30.00 | www.alshobbies.com |
|
Tailwheel Assembly
|
 |
You'll need something strong as your Yak will weigh approximately
26lbs yet light to avoid any balancing issues. Composite-ARF produce
a nice optional tailwheel.
|
£20.00 |
www.composite-arf.com
|
|
Servos
|
 |
DO NOT try and cut corners here!! There really can only be one truly recommended servo for this model and that is the JR8511 servo. At 6v the power of these is simply incredible and you will never be left in doubt as to whether you’re asking too much of the servos – you won’t be! If you fly JR already then it’s no problem. If you fly Futaba it’s no problem either as the JR plug fits all Futaba sockets (just keep an eye on the + and -). You'll need 8 JR8511 servos and a servo of your choice for the throttle (don't skimp too much here either!). If using the 8511 servos please make sure you ask me about the JR8511 servo disc problem or check the important announcement by clicking here.
|
JR8511 £67.00 each |
www.alshobbies.com
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Metal Servo Arms / Discs
|
 |
The JR8511 servo is phenomenally powerful and needs a
strong and reliable horn to transfer that power to the control
surfaces. Composite-ARF do now not recommend the white
plastic discs that come with this servo. Instead, either use a metal
disc (to which you can still bolt the Comp-ARF servo arm) or a 1.5”
all metal arm on its own. You'll need 6.
|
Arms approx £6.00 each |
www.swbmfg.com
|
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Receiver
|
 |
You will need a minimum of a 6 channel receiver to
setup and fly the Yak successfully. It would be better to have 7 or
8 channels so as to allow you the safety option of a choke servo or
fiberoptic ignition kill switch as well as the fun of a smoke
system!! A PCM receiver is definitely a preferred option.
|
£80.00 | www.alshobbies.com |
|
Matchboxes
|
 |
When using more than one servo per control surface (as you will on
the ailerons and rudder) these units are great for 'matching' the
servos to one another. This ensures that neither servo is fighting
the other throughout the range of control surface movement. In turn
this means there is no danger of drawing too much current from your
RX packs due to servos fighting one another or indeed 'burning' out
a servo that is fighting another. I admit that a geometrically
perfect installation of horns, servos and arms will achieve this too
but sometimes a little technology can help avoid hours of manual
tweaking and tuning! You'll need 3.
|
£40.00 each | www.alshobbies.com |
|
Servo Mounts
|
 |
If you choose to not to use the built up plywood servo mounts
supplied in the kit for the aileron and throttle servos, I recommend
that you use JR servo mounts for your 8511 servos. You'll need 5.
|
£1.50 each | www.alshobbies.com |
|
Extension Leads
|
 |
Make sure you use good quality heavy duty leads. Try to avoid the ‘imitation’ leads as you may find that servos etc are a very tight fit into the sockets. However, rather than a secure fit this sometimes causes the pins in the plug to be pushed back and what feels like a ‘rock solid’ joint can actually sometimes be very weak. I have used the following heavy duty JR leads in my Yak: Elevators: Inboard Ailerons: Outboard Ailerons: Rudder: Dependant upon your radio layout Throttle: Dependant upon your radio layout The aileron extension lead lengths are based on having a 'Matchbox' in each wing root which the aileron servos plug into.
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www.alshobbies.com | |
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PowerBus
|
 |
Large scale models using 8 high power digital servos, long leads,
multiple servos per surface as well as additional servos for
throttle, smoke systems and chokes can put a huge load on your
receiver possibly resulting in a failure. To overcome this possibility and introduce a whole host of additional benefits such as dual RX pack capability, RF noise filters, servo pulse amplification, battery monitors and indicators and the ability to continue operating even if a servo fail, melts the cables and shorts use a PowerBus solution. Myself and others (including many TOC pilots) have had great success with the PowerBox Professional and as a result this unit comes highly recommended. This is an optional item. Otherwise, ensure you use a good quality PCM receiver.
|
£150.00 |
More info on these powerbus solutions is available at http://www.modellbau-deutsch.com/e/start/start/start.php
|
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PowerSwitches
|
 |
These are used if running a PowerBus solution. Heavy duty, ultra
reliable and able to handle 20Amp loads they provide yet more "peace
of mind" when it comes to the equipment guiding your new investment! These are an optional item. Otherwise use good heavy duty switches.
|
£50.00 (pair) |
More info on these powerbus switches is available at http://www.modellbau-deutsch.com/e/start/start/start.php
|
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RX Battery Packs
|
 |
If using the recommended powerbus system you can run dual receiver
packs for added security and reliability by plugging the packs
directly into the powerbus. Until lithium packs become more
mainstream I side with the heavier yet far more abusable nicad
packs! General consensus on pack size ranges from 2 1900mAh packs up
to 2 2400mAh packs. If you choose to run the powerbus system or not I would definitely recommend running 5cell (6v) packs so as to attain maximum power from your servos. I would also strongly recommend using a battery backer solution too, preferably one that utilises a 2 RX pack and 2 RX switch solution.
|
£25.00 each | www.alshobbies.com |
|
Glue
|
 |
To ensure the ultimate bond when
dealing with the composite materials used in these kits use Aeropoxy.
Although quite expensive it gives good working time, will not run or
sag and when dry gives a phenomenally strong bond.
|
£13.00 | www.alshobbies.com |
|
Aluminium Cable Clips
|
These little clips are superb for attaching servo cables etc in place almost anywhere in your model. | £5.00 | ||
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Tie Wraps
|
Invaluable for holding items in place securely. | £5.00 | Local HomeBase or B&Q store | |
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Self Adhesive Foam Strips
|
These foam strips are great for protecting items that you hold securely in place with tie-wraps from vibration etc | £3.00 |
