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Sipa 200 Minijet 36" span 50mm EDF scratch build

Old 02-12-2015, 07:15 AM
  #26  
Bill G
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Covering the wings now. Covering the fuse worked well, although it was paneled out a bit, to accommodate the curves of this fuse. This isn't one to be covered with one or two pieces. The tail boom pushrods required custom bends to meet the rudder and elevator servos, and are working smoothly. I determined a method for inserted the pushrods by turning one clockwise and the other counter-clockwise after the wings are covered, without puncturing the covering. The booms will be installed after covering the wings and trimming away the portion of covering where the booms attach to the wings.
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Old 02-12-2015, 12:06 PM
  #27  
quorneng
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Bill
As all ways a very impressive build and a nice bit of covering as well.
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Old 02-14-2015, 10:09 AM
  #28  
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Thanks Quorneng. I think we will both have two very similar twin boom EDFs to fly here soon. Finished covering, with the ailerons and access doors remaining to be installed, as well as painting.

The rudders and elevator are now working well. The single servo, twin rudder setup uses a cross linkage that is routed through the stabilizer, to operate the second rudder from the servo driven rudder. After doing a few of these, they are pretty straightforward. The cross linkage is installed with the non servo driven rudder linkage attached last. The idea is to make the 90 degree bend in the cross pushrod as close as possible to the ideal location in the rudder control horn. The control horn is installed in the rudder with the bent pushrod end inserted, but is not glued in place. The control horn is finally glued in place, after adjusting it such that the rudders are parallel.

Difficult to see in the photo are small e-z link clips on the rudder cross-linkage pushrod ends, made from 1/16" aluminum tubing, since the Dubro links are for .032" and not the thinner .025" wire used here. The tubing is slit open lengthwise with a fine blade saw, with about half the length fully opened up and flattened out. The flattened end then has an "L" bend made, to create the necessary offset, and the pushrod hole is also drilled in it, using an exacto blade tip. Once installed, the slit open tubing on the other end is crimped firmly around the wire, using a pair of tweezers.
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Old 02-19-2015, 10:54 PM
  #29  
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Finished at 14.55 oz with a wing loading of 9.5oz/sq-ft using a 3s-1300 lipo. No ballast required, with the battery at the rear of the compartment and the CG a few mm ahead of the plan CG, which I believe is a bit aft. With the light wing loading I'm pretty optimistic about this one, even with the relatively low powered fan. The metallic aluminum Rustoleum American Accents paint covered well, with a reasonably low amount. As always, the Microlite covering relaxes a bit after painting, but a bit of time with a high power hair dryer shrinks it tight.

This is a model that definitely has to be hung, to paint. Came up with a hook system using binding wire, that allowed for the control line string loops to be tied around the stab first, and then simply hung on the hooks. The binding wire hooks have recessed dips at either end which keep the string loops a bit apart, so they do not stick to the stabilizer when painting.

The markings were copied from the Brian Lewis plan found on outerzone.uk. Time to get out there and fly this and the Comet soon, before March 2. We have a 30 degree "heat wave" coming soon for a day or so. Might have to try then.
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Old 02-19-2015, 11:40 PM
  #30  
xmech2k
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Looks cute! Good luck with the maiden.
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Old 02-20-2015, 12:27 AM
  #31  
pmullen503
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Really nice. Looking forward to this maiden (and the Comet!)
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Old 02-20-2015, 04:08 AM
  #32  
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I offered to maiden the Comet like a year ago. Still waiting for Bill G to drive across the continent to me!
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Old 02-25-2015, 09:28 PM
  #33  
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Nice windy 29F day for the maiden. The entire perimeter of the ball field was piled 5 feet high with snow, from the town plow folks. They were there watching the flight also.

The model flew well, of course not being terribly fast with the 3s Dr. Mad 50mm EDF. The controls proved very responsive, requiring only a touch. The high degree of plan incidence proved to be a good thing and I'm now glad that I didn't remove any, as it was pretty much trimmed dead on with a click of up trim, possibly due to being just a hair nose heavy.

The 2 feet deep snow prevented any damage from happening on the cartwheel landing, as I was running out of room and it was gliding really well. Never like to "push" something down even the slightest bit on a landing. I had to climb over the 5 foot pile to retrieve it, and then the battery door had frozen shut, from the warm lipo and snow getting in the cracks. I finally managed to open it in my buddy's car, with the transmitter still on.

Flight video: https://www.youtube.com/watch?v=czE6...ature=youtu.be
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Old 02-26-2015, 12:06 AM
  #34  
quorneng
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Bill
Congratulations and well done!

I don't have snow to contend with just wind and rain!
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Old 02-26-2015, 02:26 AM
  #35  
Bill G
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Originally Posted by quorneng View Post
Bill
Congratulations and well done!

I don't have snow to contend with just wind and rain!
Thanks. We've had our share of snow. Almost 2 feet in that field, with my shoes and socks filled with snow after retrieving the model. Touched up a few spots with silver paint on the wingtip and nose where the snow scuffed a hair of paint off, now good as new again. With an average of around 15F most days, I've been putting off a haircut for some time now.
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Old 02-26-2015, 10:35 AM
  #36  
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Great work, she flies really well.
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Old 02-26-2015, 11:02 AM
  #37  
xmech2k
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Congrats!
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Old 02-26-2015, 08:36 PM
  #38  
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Nice build and flight Bill .i hope to do a jet build soon after i finish 6 other builds. Been looking in the electric jet sections on a few sites for plans ,i have never owned a jet before. joe
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Old 02-27-2015, 10:53 PM
  #39  
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Thanks for the comments all.
Xmech I'd love to come to San Diego and fly the Comet, with your weather.
Steve I came across your Dehavilland Swallow the other day, which looks like it would be another good candidate for a similar conversion.
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Old 02-27-2015, 11:29 PM
  #40  
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very nice build and flight bill!!! also a good video
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