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Old Jul 09, 2012, 10:00 PM
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WhalleyB0Y's Avatar
Canada, BC, Surrey
Joined Jul 2011
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Build Log
whalleyB0Y's First Build (HK F22 Raptor Twin 70mm)

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This blog had originally started in the HobbyKing forums but due to complexity of uploading pictures from my ipad I will post my blog in RCgroups instead.
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Old Jul 09, 2012, 10:07 PM
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Canada, BC, Surrey
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I had my heart set on the raptor for ages but had mostly been unsure of how to approach it and what make to buy. I dreamt of building a "Hangar Queen", a prize worthy of being showcased and adored in my garage. I felt nothing looked better than the ProDesign fiberglass model at HobbyKing and I couldn't seem to make contact with Pete to send me a kit version of his Banana foamie version for which I could insert my own gear into so I chose the latter. I had drawn my research from the other available blogs and rapidly started plannin the pieces to my build. I manically sifted through reviews, websites and blogs mining the info I needed to make the best educated guess of what I might need. My head was swimming with info about thrust, wing loading, voltage options and fans. I decided it will have to get off the ground on its own accord, so it will need retracts. I wanted this plane to have alot of thrust to pull out of any high alpha manuever that goes bad, so I will need a hefty powerplant. I also wanted heaps of power to get off the ground in a hurry or to abort any awkward landings I might do. Goodies like thrust vectoring, telemetry, lighting and gps mapping are all treats I will be looking into as I go along.

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Old Jul 09, 2012, 11:39 PM
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Canada, BC, Surrey
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I had already decided on a 6s setup and I also liked WeMoTeC fans because I've used them before. I ordered in a pair of fans and a pair of 22.2V 2950kv 4mm motors from EDFhobbies.com. This will surely give me the power I was looking for at a lower amperage. HobbyKing's raptor description boasts of a large space in the plane to fit batteries. I also took recommendation on the servos required from Lolzer's build blog. I got the strongest mini digital servos I could find for the all moving elevators.
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Old Jul 10, 2012, 12:10 AM
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The last parcel to arrive was the big one!! It arrived two weeks after it was dispatched from the warehouse in Hong Kong. I followed numerous updates on my shipment status as it was transferred from one building to another, from one department to another and then finally on a plane. That was the last update. I have to comment on how well the plane was packed. They used generous amounts of bubble wrap and foam blocks and everything was carefully placed into cartons and then into a big box. The big box was inserted into a bigger box which would be taking all the courier abuse. Nothing was broken, chipped or damaged and everything appeared to be how it was described. Except for the elevator assembly block.
At first I was worried that these were missing from the contents and I knew I would never get customer service to replace them. Upon further expecting I noticed the plane construction had varied slightly in the images from other people's blog. It became apparent that I had received a newer version and several improvements had been made to the design and in particular the elevator assembly blocks. These were installed at the factory into the tail of the fuselage and it suddenly seemed possible to install the elevators without having to cut openings to access the set screws. I was pleased by this as it meant that I didn't need to damage the finish and it looked easier to put together than the other previous versions. It should be noted that there were no parts included by which to connect an elevator control horn to a pushrod from the servo arm. I would have to try and devise a method for this. I made some carbon fiber pushrods with strong rigid metal clevises. The supplied ez-connectors amd pushrods are pure crap and were flexing and twisting with very little pressure. I found 2mm collars with two set screws on either end. One would be removed to fit a nylon connector and then tightened against the 2mm elevator rod with the other set screw.

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Assembly of the elevators could easily be a blog on their own. This might very well be the toughest part of the whole build. All moving elevators would have to be very rigid and reliable in all ways. This was my first crack at doing a build like this and I didn't want to take any chances. I proceeded very slowly and carefully trying different things. I kept having to refine my ideas because there was so much slop in the elevators. Lolzer's maiden flight put the fear of sloppy elevators into me. Several people had written about having to perform surgery on the elevators themselves because the L-bend of the 2mm rod into the wing would also have slop. These could fail midair when you need them most. I didn't notice any slop with mine but I didn't trust it either. I also took the scalpel to them and cut out the L-bend using Lolzer's magnet method.

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Using epoxy steel compound I anchored the L-bends into the elevators again. And I was glad I did because now that all the slop was removed these felt so much stronger now. I feel confident that these elevators will not fail in this part when I do my first controlled loop. I have light filler, pink dap which I use to smooth out the channels dug. I also mixed some acrylic paint to match the original finish the best I could. Once everything was back together again I started to work on mounting the elevator servos.

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Old Jul 10, 2012, 02:21 AM
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United States, WA, Vancouver
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not tryin to be butt or anything but I think you posted in the wrong forum, this is the "scratchbuilt" forum. I think this is where you want to be

http://www.rcgroups.com/electric-duc...n-jet-talk-12/

Joe
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Old Jul 10, 2012, 08:03 AM
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Thanks, i will look at moving it again
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Old Jul 10, 2012, 06:06 PM
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Maybe you can help me out one more time by telling me how to delete it. I have relocated to the appropriate topic as per your suggestion thanks.
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Old Jul 11, 2012, 02:12 AM
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WhalleyB0Y,
hmmm, dont know if you can or not, no big deal, it will fix itself..
hey good luck with you build, looks cool!

Joe
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Old Jul 11, 2012, 11:00 AM
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San Diego
Joined Jul 2009
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You will need to replace the stock stab axels, they are to small in diameter for the length, they will flex and require tons of up trim. The jet flys nice but keep it light, mine is around 6-7 lbs.
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Old Jul 14, 2012, 02:09 PM
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Bri, have you any pics or videos of your raptor? I would like to see the construction methods used to keep it light as well as your power plant decisions.
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Old Jul 14, 2012, 02:18 PM
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I need to take some pics, but I used het 6904 fans and 2w-20 motors running ona single 4s 5000mah pack. I thinks it's either 1400 or 1700 watts but I can't remember. It pulls around 90 amps total. As far as weight savings I removed the foam from inside the vertical stabs, used hs225mg servos on the elevators and hs65s on the ailerons, Eflite electric retracts and built a battey tray up in the nose. I'm keeping the flights to around 4min and I have 3.75 left per cell. I will take some pics and get you some exact numbers on power and weight this weekend.
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