Hobby Lobby F-4 Phantom
Although I thought I was done with smaller EDF's my fascination with the F-4 Phantom got the better of me with this one when it showed up on the Hobby Lobby website. So, I pre-ordered mine like I imagine many others did. This bird is not what I'd consider an entry level EDF. In spite of all the Hobby Lobby propaganda of good flying manners, it still bears many characteristics of it's full sized counter part.
Basic assembly is easy and consists of gluing the two wings and vertical fin to the fuselage and attaching the servo linkages for the ailerons. Gluing on the nose cone and attaching the landing gear. They even include the glue in the kit. Pretty simple huh? Don't expect it to be that way. There is actually a discussion thread on
RC Groups
that could prove very useful if you want to take time to read it all and get past the associated nonsense posts while absorbing the useful information or you can get the "condensed version" here.
For starters, I didn't bother with opening the included glue and used 30 minute epoxy to attach my wings. I just don't trust contact adhesive for a load bearing surface. I also used a little 2 oz. fiberglass cloth and more 30 minute epoxy to line the inside of the paper thin nose cone before attaching it.
Before even starting on assembling the airframe, I installed a receiver and tested the electronics (just in case it needed to be sent back for warranty replacement). The fan vibrated, rattled, growled or whatever you might want to call from 1/4 through about 3/4 throttle and that was unacceptable to me so I decided to balance the impeller.
Removal of the fan is actually easy in this one and I'd consider it a well thought out design. 1st step was to remove the turtle deck (held on by 4 magnets) to unplug the motor leads from the ESC. Once unplugged there are two recessed screws to remove on the lower fan hatch before lifting it out of the airframe. After that the fan can be pulled out after breaking loose the glue bond. (rock it back and forth a few times and it will let go). Just as a note, when I unplugged the bullet connectors from the motor to the ESC, one of the bullets came off one of the motor lead wires before unplugging from the ESC. About a 10 minute repair with soldering iron and some rosin core solder. Not a big deal but not a nice thing to happen to a brand new model that you just paid $250.00 for. Could be very disheartening to the novice builder. After balancing the fan and getting the collet adapter properly seated I had a fan I wasn't ashamed to take out in public and continued with the assembly. The whole process probably took about 6 hours spread over a couple of evenings and included the extra time for glassing the nose cone and balancing the fan.
I wasn't real thrilled over the threads in the linkages provided with the kit and after getting everything centered up applied some ca glue to the threads. CG balance is another issue and the assembly guide that came with mine is flawed on the measurement. It called for 165 mm from wing leading edge at the wing root. That translates to about 6-3/8" on a delta wing with a 14" root chord and that far back will almost guarantee a very short flight with disastrous results.
I opted to set mine at 4-3/4" from leading edge for the maiden flight which was pretty nose heavy. The second flight was done at 5" back and is the one shown in the video. I have since then moved back to 5-1/4" and it feels pretty good there. I'm really hesitant to go any further back although I may eventually try 5-1/2". If you visit the RC Groups thread you will find a few instances where the suggested cg was used for the 1st flight. None of them were successful and ended in a nose high stall at take off followed by fall to the earth and broken parts.
Flight is not overly fast and I'd "guestmate" it to be around 70 mph. It's not as fast as a stock Phase 3 F-16 and it's not nearly as forgiving if you slow it down too much. When you come off the throttle of this one it becomes the "flying brick" that the full sized version was. Reduced throttle can be used while running in a straight line but it needs some power and speed when coming around a corner or it will fall out of the air. There's a bit of a learning curve to landing it as well. It has to be flown to the ground with power on and the touch down flare just about perfect or it will bounce back into the air as demonstrated in the video. If it happens the best thing to do is power it back up and go around for another attempt or you'll look like me. <g>
All in all, it's still a good looking model in the air and the price is for an almost receiver ready model that includes 5 servo's, ESC, fan & motor and even a 4s 2200 ma lipo pack. Add your radio and chager then go fly. Chances are there were at least 3 more sold in this area after mine made itss debut. Now if I could just get a commission check.