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Very Hot Topic (More than 25 Replies) Reduced Miss World's Fair Embryo (Read 1686 times)
Sky9pilot
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Re: Reduced Miss World's Fair Embryo
Reply #11 - Sep 26th, 2022 at 12:03pm
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Looking very good Ian...can't wait for the maiden and seeing how the capacitor power works out for you.  I wonder if it could power the small EDF I have for my FJ4 that gained too much weight and I'm thinking of making another one much lighter.  Keep up the great work!
  

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pb_guy
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Re: Reduced Miss World's Fair Embryo
Reply #10 - Sep 26th, 2022 at 10:45am
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General pieces. The black supports in the window are bamboo as is the tail skid. The piece of balsa in the landing gear area will be cut out in order to glue in the capacitor and charging port. The Landing Gear will go just in front of the capacitor. Noseblock will be 1/4" balsa drilled out for the motor. I sheeted the center section of the wing with 1/32 balsa sanded thinner in order to take the rubber bands holding on the wing. I will  use a couple of bamboo toothpicks for the wing supports.
ian
  

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pb_guy
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Re: Reduced Miss World's Fair Embryo
Reply #9 - Sep 23rd, 2022 at 10:42am
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This is the motor and capacitor assembly from J&H Aerospace. Weight: 5.75 grams.
The wing follows my usual construction. Laminated tips. 1/16" sq LE and TE. 1/32 sheet ribs on the forward half. X bracing for the trailing ribs. The X-es are glued together where they cross. Along with the built up main spar, it makes for a strong and more rigid structure without adding a lot of weight. The last 2 wing bays don't need the I-beam support, so it is just a piece of 1/16" sq stock.
ian
  

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pb_guy
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Re: Reduced Miss World's Fair Embryo
Reply #8 - Sep 22nd, 2022 at 10:09am
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Broke the stab with fumble fingers. glued it back together with some support. Wing tips laminated over a form.
ian
  

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Sky9pilot
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Re: Reduced Miss World's Fair Embryo
Reply #7 - Sep 21st, 2022 at 8:31pm
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Ian,
There are very small EDF's (electric ducted fans) that are made with only an 11" to 16" span necessary to get them to fly.  Check this out at HPA: Click Here
  

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And ye shall know the truth, and the truth shall set you free. Jn 8:32
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pb_guy
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Re: Reduced Miss World's Fair Embryo
Reply #6 - Sep 21st, 2022 at 10:48am
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Thanks Mike. It took a bit of searching to find a suitable project. I was also thinking of burying a motor inside a jet body, but you need a large intake and exhaust. Or huge adjustments would have to be made to the design.

  Fuselage structure.
  

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MKelly
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Re: Reduced Miss World's Fair Embryo
Reply #5 - Sep 21st, 2022 at 10:25am
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Very cool project Ian.  I've looked at that Miss World's Fair embryo plan several times and would like to get around to building one someday.  Really curious to see how it goes with the supercap - there are so many neat aircraft that would be more practical with that power system than rubber motors (like all the beautiful seaplanes with engines in nacelles high on the wings).  Your structure looks great so far.

Mike
  
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pb_guy
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Re: Reduced Miss World's Fair Embryo
Reply #4 - Sep 20th, 2022 at 10:59am
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Fuselage.
ian
  

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Too Much Glue
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Re: Reduced Miss World's Fair Embryo
Reply #3 - Sep 20th, 2022 at 6:34am
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Wow, 3 minutes is a long motor run. I guess were talking 30 seconds of climb with over a minute of cruse. I think I would want to make sure it was going to crank around in a turn before I let it go.
  
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Re: Reduced Miss World's Fair Embryo
Reply #2 - Sep 19th, 2022 at 10:23am
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  The unit is from J&H Aerospace. it runs for almost 3 minutes total with about 30 seconds of good power output at the beginning, trailing off to nothing.
ian
  
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Re: Reduced Miss World's Fair Embryo
Reply #1 - Sep 19th, 2022 at 6:48am
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So, this 18-inch model will be powered by electric motor. Electricity to be supplied by a capacitor. Well, I think that's pretty cool  Cheesy Where do you get the motor and capacitor? How much time do you expect for motor runs?
  
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pb_guy
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Reduced Miss World's Fair Embryo
Sep 18th, 2022 at 7:51pm
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I got myself two supercap engines and I looked around for a good subject. I was initially thinking of the Broussard because of Mike Kelly's great build. However, I decided on the Miss World's Fair Embryo scaled down to an 18" W/S. I am shooting for an all-up weight of about 16 grams.  The motor/supercap combo weighs just over 5 grams.

  Starting with the laminated rudders and the wing spar, built-up as per usual for me. Instead of "I" beam spars, they were more of a "C" channel. The end-on shot of the spars shows that I used a piece of bamboo that I had coated with wax crayon to prevent it from sticking to the glued balsa.

ian

(PS. I have not given up on the Maryland, just taking some time out for this project)
  

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