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Vee-Bee

by Greg Sharp

Plan No. 661

Specifications:  
Wingspan 1.53m
Engine .25 - .40
Radio 4 Channel 
Plan Detail

Plan No. 661
Price:
AU$30.00 plus P&H (AU$2.00 within Australia).  

Order Details
By Phone: (03) 9333 5100
ByFax: (03) 9333 5099
By Email:
By Mail: Airborne Plans Service: 
PO Box 30 Tullamarine Vic, Australia, 3043

Lets begin by cutting out as many parts as is practical to give a partially complete kit which will make assembly of the model quicker and easier.

TAILPLANE

Construction of the tailplane is straightforward being built up over the plan from 10mm balsa sheet. Once removed from the building board shape the leading edge, tip and bevel the inside edges to obtain the dihedral angle of 110 degrees. Both halves are then joined with the two ply dihedral braces. I also wrapped the join with a cloth bandage and PVA.

Cut and shape the ruddervators and trial fit to the stabiliser. I used pin hinges which were epoxied in place after covering and painting.

FUSELAGE

Commence construction of the fuselage by glueing the 6mm x 3mm spruce longeron to formers F1 through to F7 using a jig to maintain the correct alignment leaving out F8 until the rear stabiliser is installed.

Install the wing seat, FD 1, FD 2 and the 6 mm square balsa stringers to form the fuselage framework. Next glue the fuselage sides to the framework again maintaining the correct alignment.

The V tail assembly and F8 can now be glued in place making sure it is correctly aligned with the wing.

Complete the fuselage by fixing the undercarriage mount, cockpit floor, top and bottom sheeting and the tail cone. I made two access hatches, one under the fuel tank for easy access and installation of the tank and one under the "V" tail to make installation of the push rods easier.

Mount the engine and make up the nose cowl and then prepare the fuselage for final finishing.

WING

Commence construction by cutting standard wing ribs W1 and W2s leaving the W1s in one piece at this stage.

The two wing halves are made up over the plan in a straight forward manner. Pin down the bottom spar over the plan then pack up and pin down the leading and trailing edge stock remembering the trailing edge carries through to the tip. Glue in place all W1 and W2 ribs remembering to angle the root rib to allow for dihedral.

Glue in place tip rib W3, then the top spar. Shear webs and triangular gussets can also be installed at this stage. Before removing wing panel from the building board glue the top leading edge sheeting on.

Cut out slots in W1 ribs for the dihedral brace and the aileron servo. Install the ply dihedral brace thus joining the two wing halves together. Install the torque rods and aileron hinges to the trailing edge and pin with bamboo skewers. Make up and glue in place the trailing edge centre sections remembering that the top and bottom centre sheeting will be laminated to these making a stronger joint.

Cut and shape the aileron and tip trailing edge section and trial fit to the wing. I made mine out of 12mm sheet with a 1.5mm lamination to the top surface. Complete the wing top, bottom and centre sheeting, cap strips and also glue on the tip blocks and fuselage fairing block. Careful shaping of the wing, especially the tips is critical to the final performance of the Vee-Bee. Sand the wing in preparation for covering of your choice.

FINISHING

I chose to paint the fuselage, ailerons and ruddervators with gloss enamel after a base coat of pink primer.

The wing and rear stabiliser were covered with profilm.

The aluminium undercarriage was mounted to the bearing plate using 3 T nuts and bolts. Make up the pushrods (as I did) or as an easy alternative install snakes during construction.

With ample room in the fuselage the radio can be juggled around with ease to find the correct balance point.

 

FLYING

The Vee-Bee is assembled and the control surfaces checked for correct response and a range check carried out on the radio.

The OS 25 was started and the Vee-Bee carried to the flight line. The tail rose off the ground quite early in the ground run and was easily kept tracking straight with the ample rudder control. Once flying aileron and elevator were switched to low rates and the Vee-Bee was still quite lively.

After several low passes for the camera the Vee-Bee was set up on approach and landed with no problems.

With elevator and aileron throws reduced another flight was undertaken this time for the Vee-Bee to undertake some basic aerobatics. The stall was gentle with no tendency to drop a wing. It rolled well with little elevator input needed to maintain an axial roll and performed inside and outside loops with ease. It was difficult to maintain level inverted flight without the Vee-Bee wanting to right itself.

The Vee-Bee is a model with a different line to conventional models and being reasonably small is easily transported.

It is easy to construct and would be an ideal aircraft for the modeller who wants something different at the field.

The OS 25 provided enough power with the thought that the Vee-Bee would be a lively performer with a larger power plant.

The final setting of the control throws were as follows.

 

Plan Detail

Plan No. 661
Price:
AU$30.00 plus P&H (AU$2.00 within Australia).  

Order Details
By Phone: (03) 9333 5100
ByFax: (03) 9333 5099
By Email:
By Mail: Airborne Plans Service: PO Box 30 Tullamarine Vic, Australia, 3043
Airborne Plans Service: P.O. Box 30 Tullamarine Vic, Australia, 3043