NEWS!! Models by John is very excited to announce price drops for the AirPower line of fan units. AirPower has dropped their pricing and we're passing the savings on to you

Airpower AP-900DF

The AP-900DF is a newly designed 90 mm diameter, easy to assemble, electric ducted fan unit. Assembly is very quick as there's no construction required, only attaching the motor and mounting the impellor assembly. The Carbon Fibre tail cone can be either bonded or taped to the motor tube. This unit has been designed to produce performance figures in the 1000 watt range, however, this has already been exceeded by this manufacturer. As with all high rpm propellers and ducted fan impellers, all should be balanced prior to use to reduce vibration to a minimum.

Tests were conducted with the following motor, electronic speed controller & cells ( see the photo of the test bed ).

MOTOR: Plettenburg HP220/30/A4 S P4

ESC: Jeti Master 77-3P OPTO

CELLS: 20 X IB3600 NiMh

RESULTS: 55 AMPS, 1275 Watts, 5.25 lbs of Static Thrust

Cost: $59.00 (Canadian Funds) Plus shipping (Ontario Residents add P.S.T.)

NOTE: A fiberglass intake ring & thrust tube will be offered separately, pricing to be announced shortly as the moulds are presently being made. Also, a fiberglass nacelle that will integrate the intake ring will also soon be available for the external mounting of the AP-900DF unit.

Airpower AP-700DF

The AP-700DF is a newly designed 70 mm diameter, easy to assemble, electric ducted fan unit. Assembly is very quick as there's no construction required, only attaching the motor and mounting the impellor assembly. As with all high rpm propellers and ducted fan impellers, all should be balanced prior to use to reduce vibration to a minimum.

These units have a 5 bladed impellors, fully moulded one piece shroud, a moulded intake lip that snaps onto the front of the shroud. The impellor is mounted onto the motor shaft via a very accurately machined collet style prop adaptor.

MOTOR: Mega 16/15/3, REDCON RA2815/3200, or other SP400 sized brushless motor of similar rating.

The fans maximum rpm rating is 45,000, and maximum thrust is 10 newtons (36oz !!!!!)

Cost: $39.00 (Canadian Funds) Plus shipping (Ontario Residents add P.S.T.)

WeMoTec Midi Fan

Click here for the technical drawing

This fan has a one piece 90 impellor that comes nearly ready to use, just like the Mini Fan 480. The shroud is a one piece item and all that is required is to bolt the motor in, attach the adaptor, slide the impellor on and screw down the spinner. For external use, it comes with a moulded intake lip. This fan can easily handle the medium sized planes, even exceeding 6 lbs in all up weight. ( the Banshee, manufactured by this company weighed in at 5lb 8 oz's and flew exceptionally well on the first flight ) This sturdy unit can handle input power up to 1000 watts and produce up to 71 oz's of static thrust.

I currently have 6 MidiFans left in stock, and there will be no more after these are gone.
CAD$85 - Until they're all gone

GWS EDF-40

These well made micro sized EDF units come completely assembled. The motor has a heat sink attached to assist in dissipating heat. The impellor is a one piece, 6 bladed design. These items are ideal for multi jet indoor projects or even outdoor use in calm air conditions.

Using NiMh or modern Lipo battery packs to maximize the flight durations, these units draw only 4.9 amps when under load at the recommended maximum voltage of 8.4 V.

Due to their compact size and light weight, building a 6 or even 8 engine plane is now possible without breaking the family budget. The B-52 comes to mind.......

PRICE: $20.00 ( Plus Tax )

Specifications

Volts	Amps	Thrust(oz)	Watts	Efficiency(oz/w)
6	3.1	1.87	18.6	0.10
7.2	3.9	2.50	28.08	0.09
8.4	4.9	3.05	41.16	0.07

GWS EDF-55-300H

In response to customer suggestions in upgrading the GWS A-10 Warthog with more power, they have designed this very efficient 55 mm diameter EDF unit. Although there are three different models of this fan, Models By John is selling the version that delivers the best of both worlds, good power at low amp draw. The unit is all ready assembled for the customer, with the wires ready to be hooked up. The Speed 300 sized motor is capable of generating up to 76.68 watts of power but only demands an amp draw of 7.1

The impeller is a 6 bladed item and can be removed from the motor shaft by loosening the two set screws in the event the motor is needed to be changed. An allen wrench is included in the box.

Now multi engine projects can done without costing hundreds of dollars, there's no excuse now for you to plan next seasons jet. You could even upgrade the unit with a brushless motor that has the same shaft diameter of the standard Speed-300 motor. There are no adaptors to fit other shaft sizes at this time.

PRICE: $26.00 ( Plus Tax )

Specifications

Volts	Amps	Thrust(oz)	Watts	Efficiency(oz/w)
7.2	4.3	3.77	30.96	0.12
8.4	5.3	4.55	44.52	0.10
9.6	6.1	5.57	58.56	0.10
10.6	7.1	6.38	76.68	0.08

GWS EDF-75X4A

This light weight 75 mm diameter EDF unit comes out of the box ready to use. Included with this EDF unit is a snap on streamline tail cone. This fan has the EM-400 brushed motor included which is a speed-400 class motor. This fan comes in two designs, a four bladed impeller and a six bladed impellor. After comparing the specifications, Models By John has decided to sell only the four bladed version as it produces the most thrust at still a reasonable amp draw.

This fan was designed to be internally mounted with a intake and thrust tube ducting so the best efficiency can be obtained. Do not use this fan without a intake ring or ducting of some sort, your thrust and watts will be lower.

The impellor can be removed by loosening the two set screws on the adaptor and a allen key wrench is included in with the unit. This is so the replacement of motors can be done easily if required.

Although this fan was never designed to compete with the more advanced and expensive EDF's on the market in this class, it was designed so everyone could afford to experiment with a reasonable sized jet, being a single or multi fan plane. To get the most out of this fan, keeping the all up weight of your plane is very important, so Lipos are the way to go with this unit.

PRICE: $30.00 ( Plus Tax )

Specifications

With Intake Ring & Thrust Tube

Volts	Amps	Thrust(oz)	Watts	Efficiency(oz/w)
7.2	6.2	6.42	52.08	0.14
8.4	7.9	7.90	75.84	0.10
9.6	9.7	9.84	104.76	0.09
10.8	11.4	10.65	136.80	0.08
12	13.1	11.43	172.92	0.07

With only a Thrust Tube

Volts	Amps	Thrust(oz)	Watts	Efficiency(oz/w)
12	12.5	9.91	165	0.06