RCU Review: Greg Covey's Amp'd Issue 17: The Flying Season


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    Contributed by: Greg Covey | Published: July 2010 | Views: 19139 | email icon Email this Article | PDFpdf icon

     

     

     

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    Issue 17
    Article By Greg Covey

    Print Issue 17 "The Flying Season"


    In the Northeast, the winter months tend to be long and cold. After the holiday season is over, the short and uninspiring grey days can take their toll if you don't keep yourself occupied. Although we get an occasional chance to fly off the snow, which is greatly cherished, the majority of our time is spent toiling away in our favorite hobby...building airplanes. Before we know it, our visions that drove us through the long winter season have taken shape and are ready to test.

    When springtime finally arrives, my buddies and I are very excited to get outside to fly our new models and favorites from the past year. In this month's issue of AMP'D, we test planes from the last few issues and give tribute to what we call, the flying season!


    Hobby Lobby Executive Jet

    The twin ducted fan jet on the right is designed by Super Flying Model and sold in the U.S. by Hobby Lobby International. It is made from molded-bead foam construction, has a 47" wingspan, and meant to fly at around 47 oz. or 3lbs. The model resembles a Learjet 45XR with the lower dart fins on the tail. The larger engine pods are typical on an EDF powered R/C model.

    Although the retracts worked fine, I did not feel that they would work on grass take-offs and landings. I was proven wrong right on the first flight. Not only did it take off from grass very well, it flew very well with no modifications other than the upgraded power system.

    On foam planes like the Exec Jet, coating the nose tip, leading edges, and areas where there are no decals, with finishing epoxy, helps protect the model from bumps and rash with only a minimal increase in weight.

    My Executive Jet looped with ease and performed very well even in some wind.



    Test Flying

    My power system was upgraded from the stock 3-blade rotors to the well balanced Wemotec 504 rotors while still using the stock pre-mounted fan units. Ductedfans.com sells a nice Dual Rotor Upgrade Kit (WE504ex2) for this purpose. The Wemotec rotors and adapters allowed me to use the 3.2mm shaft AMMO 28-35-3900 Brushless Inrunner motors to double my power level over the stock 2.3mm shaft SFM Outrunner motors. I used the recommended Thunder Power (TP21003SPL2) 3 Cell 11.1V 2100mAh Lipo Packs for proper balance and long flights approaching 10 minutes with mixed aerobatics.

    The SFM Exec Jet flight testing went very well and the video below shows just how easy it can take off and land on grass. Although I did not try it, I expect that it can also be hand-launched without difficulty. Overall, the SFM Executive Jet exceeded my expectations and proved to be a great start to the 2010 flying season!



    Executive Jet Flying Video (11 meg)



    Nitro Planes' Hero 100 Twin EDF Executive Jet


    In the last AMP'D column, we left off with the "Version 2" Hero 100 Twin EDF Executive Jet from Nitro Planes ready to fly but without the retracts working. This is how we tested it on the maiden flight. I figured that if all went well, I would complete the air line connections and add the valve servo.

    Not only did the Hero 100 take off with authority, it stayed on step the entire flight! We tested slow flight, flaps, and stalls.

    When the plane landed, we were all impressed with the flight performance. It was time to make the retracts work.

    In the video below, test pilot, Lynn Bowerman, takes the Hero 100 up for its maiden flight without retracts. The flaps worked well without any pitching, the struts kept the plane from bouncing on landing, and the navigation lights could still be seen in the bright sunlight. It was fun to finally see the PH-LAB airborne.

     

    Hero 100 Maiden Flight Video (10 meg)


    Finishing the Retracts:

    The retract valve and servo were conveniently mounted on the bottom hatch. Be careful to clear the wing support rods as shown. I used a pre-enjoyed micro servo that I had for many years. The regular tiny white "T" connectors and retract air valve are supplied in the Spring Air 301 retract kit.

    The following parts were used for an easy hook-up and disconnect. Note that I simply secured the air intake mechanism with a few nylon cable ties up front. The stock tiny Spring Air tank was replaced with a larger Robart tank. When using the newer Spring Air valves, the air intake is on the center fitting side. When using the other side that it off center, weird things happen.

    • Robart #169 Pressure Tubing
    • Robart #172 Small Pressure Tank
    • Robart #226 Quick Tees
    • Robart #189 Air Line Restrictors


    Second Flight

    The Cessna Citation II (Hero 100) continued to exceed expectations. On the second flight, the retracts worked great and the passengers got a real thrill ride!

    It was quite windy out but the Citation had plenty of weight and power to handle the conditions. On the very low pass, you can see the plane wobble a bit from the ground turbulence. The Spring Air retracts and Robart main struts performed very well using the Robart restrictors. The articulated knee nose gear from Golden Skies R/C does a great job at channeling the bumps up front. Although I probably didn't need the larger Robart (small air tank), I prefer having the reserve of multiple retract cycles available.

    A few more flights on the Cessna Citation II went very well. After some quick prep work, the plane took off with plenty of authority and flew very stable. The retracts and struts continued to work very well on landings. Flight times were about 5 minutes with mixed flying and some safety reserve for landing.

     

    Hero 100 Second Flight Video (15 meg)



    Demo Time

    I was at a local R/C show in upstate NY where Team Futaba's Dan Landis and his dad, Richard, were giving noontime demos on his giant scale aerobatic planes. When Dan spotted the PH-LAB Executive Jet, he was already nodding his approval before I finished asking if he wanted to fly it.

    During the demo flight, full-scale Gulfstream pilot, Greg Kessel, performed the commentary as if being on-board with his new co-pilot that just received his license...in the mail!


    Hero 100 Demo Flight Video (14 meg)



    Aeronaut F9F Panther


    The Aeronaut F9F Panther fiberglass EDF model was designed after the Grumman F9F-5 Panther. The Aeronaut model has a 52" wingspan and weighs about 7-8lbs when flying. It is an all fiberglass ARF with German-engineered quality which is the best I have seen to date. It sells with and without retract bays for about $700 at Icare RC and Ductedfans.com in the U.S. and at WeMoTec overseas.

    In order to finish my Aeronaut Panther properly, I solicited the help of my friend, Paul Weigand. Paul applied the decals with expert precision and created some wing tabs so I could easily secure them for flight without gluing them permanently in place. A small screw on the bottom side of the wing not only secured it for flight but also marked the proper CG.

    The original release of the Aeronaut Panther in 2003, which is what I have, did not have landing gear bays or cutouts in the fuselage. It took off from grass using only 700 watts on 16-20 NiCd cells. It could cruise around on only 200 watts in low wind conditions or speed up to over 100mph. The second release around 2007 had gear bays, cutouts, covers, and a battery bay.


    Battery Box

    Paul also created a long battery box using aircraft grade light plywood. The box allowed me to place the two 4s 4000mAh Blue LiPo packs end-to-end so that the weight was distributed along the fuselage and I could easily connect them in series for a 8s total.



    Test Flying the Panther

    Since we were taking the Panther off grass on its belly, we applied a wide strip of 3M Scotchgard Paint Protection Film on the bottom of the fuselage and tip tanks. This protection film is transparent and nearly invisible to the eye. It helps protect against stone chips, bug damage, abrasion, and weathering. The 3M Scotchgard Paint Protection Film is available in any size and length at Empire Clear Shield.

    My power system for the Aeronaut Panther used newer technology components along with the proven high-quality WemoTec Midi Pro 90mm ducted fan with its dynamically-balanced rotor. The ARC 36-75-1 inrunner motor delivers about 2700 watts on an 8-cell LiPo pack in the Midi Pro 90mm fan.

    Since the original power system for the Aeronaut Panther in 2003 was only around 1000 watts. My 2700 watt power system required some additional work to keep the intake ducts from imploding. Further, my "new" model had already been stored for 6 or 7 years in the box so the intake seams may have weakened. The intake duct lips were sanded and resealed along the opening rim with a fiberglass cloth coated with V-poxy. This was also done along the seam that goes lengthwise down to the DF unit. The V-poxy dries as hard as a rock so my intake ducting seemed much stronger after this effort.

    Team JRs, Devin McGrath, tested the Panther on it first few flights. The flight performance was incredible and the glide performance almost unbelievable! Without any retract openings on the bottom, the super-clean fuselage seemed to glide forever, making the Panther difficult to land without proper setup.

    After the first few flights, we decided that the tail flex of the horizontal stabilizer was causing pitch changes when the Panther banked too sharply at high speeds. When banked softer, at high speeds, it seemed ok. The tail was easily removed with the single screw and I glued some thin hardwood sticks along the sides and a third thicker one across the center where it meets the fuselage. This made the tail much stiffer with minimal weight gain.

    The next set of test flights are scheduled for later this summer.


    Aeronaut F9F Panther Test Flight Video (16 meg)



    RC Lander PC-Coated Panther


    The RC Lander PC-Coated Panther uses a revolutionary new PolyCarbonate (PC) process that provides a hard 0.3mm shell finish over foam. It won't dent, break, or shatter. The PC is a lightweight coating that is lighter than fiberglass and adds durability to foam never seen before. The smooth glossy finish can be painted without surface preparation with a result that resembles a fiberglass model but has a lower cost.

    At the time of writing this column, we were still experimenting with the RC Lander Panther. Although it did not have the power to take off from grass, it could be hand-launched when lightened by removing the landing gear and using the 4s power system. We expect that the 6s power system and retracts would work fine off pavement.

    Tim Wan has introduced an upgrade power system for the PC Panther that utilizes their 76mm EDF. The thrust ratio is now close to 1:1 and the AUW is only 175g more than before when using the same 6s 3300mAh batteries. Flight times are still around 3 minutes with full throttle flying.

     

    Summary

    For this flying season, when it comes to executive jets, it's all about passenger comfort. Although these planes have plenty of power for aerobatics, it is an awesome feeling to fly a model scale and suddenly have it look very real.

    The Cessna 550 DF100 designed by Hero Models, was only one model in a line of low-cost fiberglass/wood jets that has introduced many R/Cers to larger EDF power systems...without breaking the bank! These models were made in different factories, in Yi Chang and Wuhan China that were hit hard by the global recession. It is our hope that we will someday see them return to the hobby market.

    Although smaller EDFs are today's biggest seller, larger sized jets are available for those enthusiastic modelers with the means. The Aeronaut F9F Panther was my first high-end EDF that revealed amazing quality in the assembly, fiberglass, and finish. Even though it was a smaller mid-sized model, the level of scale detail required no modifications.

    In the Northeast, although it is possible to fly during the winter months, most of our flying is done from May through September. During these months, we get outside as often as possible to fly our new models and favorites from the past year. If your hobby is an obsession, as it is for me, we mark all the R/C events on the calendar and try to schedule the rest of our life around the flying season.

    When you fly electric, fly clean, fly quiet, and fly safe!

     

    Special thanks for contributions by:
    "Papa Jeff" Ring, Paul Weigand, Lynn Bowerman, and Dan Landis

     

    This section of AMP'D covers some of the questions that our readers have sent in and I thought would be interesting for others.

    Josh J. asks: How did your epoxy hold up on the Hawk? I was afraid of the extra weight and now mine has lots of dings.

    Hi, I assume you mean my FlyFly BAe Hawk which was brushed with BSI 20-minute Finishing Epoxy. My Hawk is two years old now and was recently flown in June by Dan Landis. It still looks great and I think Dan was pleasantly surprised at how well it really flew.

    SitNFly asks:

    Hi Greg,

    Sometime when you are bored, could you post a few tips on estimating amp draw for EDFs? I like your thrust rig but I am wondering if any of the software packages available for prop/motor combinations can be used for EDFs?

    Hi,

    You may be interested in trying the eMotor Calculator for Ducted Fans called eCalc. eCalc are software services to calculate, evaluate and design electric motor driven systems of any type. This is a free Service for non-commercial users. The calculator works with JavaScript, so you have to turn it on in your browser.

    It's a great calculator to get you started in the right direction, but it does not include all of the component choices that are available today.

    Ask questions by e-mailing me at greg@rcuniverse.com

     

    Dubro (#480 and #481) E/Z Bender Wire Forming Tool

    Castle Creations' Castle Link Quick Connect


    ElectriFly Turbo Cirrus GTS SR-22 EP
    ParkZone F4F Wildcat PNP or BNF

    Print Issue 17 "The Flying Season"

     
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