Robart#148E 90 deg Electric Rotating Retracts 1/5 Scale
Robart are now offering an electric version of the retracts. No more air leak problems! The same reliable mechanics are used and the air cylinders are replaced with electric actuators.
The control unit controls 3 actuators and can be configured in many ways.
Speed is controlled by the voltage. It can use the receiver battery for power, but I would recommend a separate battery . 4.8-9.0 volt is the range with the higher voltage giving faster retract speed.
"Amp-Out" circuitry is used to sense the limits of up down travel.(No limit switches!) This system will also stop the sequence if an obstruction is met.
When the amp draw reaches a pre-set limit the motor is completely shut off. If a retract "hangs up", the battery will not be drained. Just use the retract switch, on the transmitter to move the gear away from the obstruction.
Adding panel lines and rivets can make your RC Corsair really stand out and can be fairly easy to do.
This article by Garry Yarish of the Chesapeake Bay Radio Control Club shows the procedure using Sharpie felt tip pens (Ultra Fine tips). Any mistakes can be wiped away using alcohol but the finish is OK with gasoline residue.
Fibreglass Specialties Cowl
The supplied cowl is perfectly OK, but it does have the cooling flaps closed.
Fiberglass Specialties do offer a cowl with the flaps open. This makes for a cooler engine and may be considered.
The cowl is unpainted and thus needs finishing.
The model number is TF-20. Click here for more details.
Electrical Conversion of the RC Corsair
This RC Corsair was not designed for electric power. The main problem is access for lipo battery change.
A fuselage side hatch could be added but I would consider this option- Mount the lipos in the radial cowl.
I have done this on my 1/5 scale Gloster Gladiator and also split the cowl and used rare earth magnets to hold the cowl in position.
Regarding motor and battery selection, I use the Castle Creations Flight Calculator. This saves a lot of time and you can try different combinations of motor,battery and ESC and get a good idea of the models performance.
Splitting The Cowl
This idea originated with Bob Benjamin. His website has a TON of great building tips. You can visit it by clicking here.
On this page he is building a Top Flite Stinson SR-9, that has a large radial cowl, similar to the RC Corsair.
The page shows how to split the cowl and install the rare earth magnets.
Gloster Gladiator Cowl
My 1/5 scale Gladiator has a balsa radial cowl, but the principal is the same and can be applied to the RC Corsair fiberglass cowl.
The great advantage of using this idea is that the heavy lipos are placed as far forward as possible, to assist in balancing and are easily accessible for replacement. The view to the right is a side view. ( The "floor" would be on the left hand side of the drawing) Sorry for the confusion!
This view shows the front elevation. You can see that the lipos and the ESC are all mounted, using velcro or cable ties, to the motor mounting bracket.
If you would like to see more information on this method of cowl construction, click here to visit the page on this web site
Here you can see the permanent part of the cowl, that is mounted to the firewall.
The rare earth magnets can be see, embedded in the ply split plate. Each magnet exerts a pull of 11 lbs, so the cowl is held on with a force of 44 lbs!
Here is the removable half in position.
The force holding thing together is enough to resist flight loads but a strong"tug" will remove the half for access to change batteries
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