Yellow Aircraft F-4E Phantom II - ARF
Here it is my Yellow F-4 Phantom $2,400.
Recduced to $1800.00
This Jet was custom built and painted builder made his own formers to make the airframe much lighter for EDF flying. It currently weighs 10.2 lbs with: Servos, Fan & Motor, Retracts, wheels and brakes.
Included with this Jet is the following:
Sapac Dynamax 100mm fan with Scorpion 4035-800KV
Tams Air Retracts wheels and brakes
Airleron servos HS5245MG
Elevator servo HS5685MH
Rudder servo HS5125MG
Steering servo HS475HB
Jet is painted in Automotive Dupont paint.
The following is the specs of this Sapac 100mm fan with Scorpion 4035-800 KV as tested by Carl Rich
100.3mm Fan ID, 7901 mm square
58.3 Motor housing OD 2669 mm square
FSA = 5232mm square = 81.5mm diameter exhaust
80% FSA = 4185.6 mm square = 73mm exhaust diameter
FSA 60% = 63.2mm exhaust diameter
Temperature 55F very low humidity in tropical Ohio.
HV 160A ESC settings
Motor Timing 5
100% FSA exhaust 12s 6500mAh 40C Thunder Power cells warmed to 90F
Volts start 50.35v dropping to 44.34v, 134A holding, 221.2oz Thrust (13lbs 13.2oz), 6000 watts holding, 32,325rpm, 246mph efflux w/o moving pitot tube in the exhaust duct to find max efflux.
80% FSA exhaust 12s 6500mAh cells recharged and heated to 90F
50.33v - 44.3v, 130A, 204oz (12.75lbs) T, 5850W, 32,325rpm, 274mph efflux moving pitot tube to maximize
100% FSA same cells, 10s
41.15v - 37.6v, 100A, 162.8oz (10 lbs 2.8oz), 3840W, 27975rpm, 206mph efflux w/o moving pitot tube to mazimize.
80% FSA exhaust same 10s recharged
41.3v - 37.6v, 100A, 152oz (9lbs 8 oz) T, 3750 W, 27,950rpm, 237mph efflux moving pitot tube to maximize.
Just to know what would happen I cut the exhaust WAY down to 60% FSA to see the affect on thrust and air speed. Drops 2 lbs of thrust and appears to lose airspeed when compared to the 80% FSA exhaust but this test was actually done before the 80% test and I was not moving the pitot tube around so efflux could be higher that the 224 recorded.
60% FSA exhaust same 10s
40.77v - 37.13v, 88A, 118.2oz (7lbs 6.2oz)T, 3300 W, 27,900rpm, 224pmh efflux w/o moving pitot tube to maximize.
This fan makes significant efflux (highest I've ever tested) and quite a bit of thrust considering the FSA is just a little more than that of a typical 90mm fan (DS 51 is 5100mm square). Lower FSA would make it rather ideal for use where a jet's inlet ducting is a bit small for most 100mm fans.
In a jet made for 100mm, 80% exhaust on 12s would likely drop the current to the 120A range and work fabulous with 5,000mAh packs.
I tested the Sapac's larger 127mm fan w/650kv motor on the thrust stand and found that when I put it in the big Cermark Viper the current dropped 10Amps due to the fact that less air can get to the fan once placed in ducting when compared to the open face w/ inlet ring while on the thrust stand.
Wires coming out of the side of the fan is a nice touch that makes for a clean thrust tube w/o a wire hole.
Last edited by rcjets12; Mar 15, 2012 at 10:06 AM.
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