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Author Topic: Thermal Magnet Outdoor Embryo Design  (Read 388 times)
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AAdamisin
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« on: October 11, 2020, 12:34:13 PM »

I have been building many free flight models this year.  I really enjoy Embryo and wanted to design an outdoor model that went to higher aspect ratio wing and longer fuse to house a long motor.  I looked through several designs for inspiration and settled on a 20in span, 14in hook to peg, a DT, and allowance for an 8in prop.  I used a USA 22 airfoil for the wing and NACA 3407 for a lifting tail.  I put turbulator spars at 11%, 22%, and main spar @ 33%.  I went with flat center and dihedral tips (polyhedral) as I felt that gave the most stability and resistance to wind recovery.

Model is almost complete, but work hours have really impeded my progress.  I had planned to fly this at the McCook field in Dayton last weekend, but flew my Scout Flier embryo instead for a 7:00 OOS on my 1st official.  Now I need a new indoor and an outdoor model.  Will never again fly an embryo outdoors without a DT. 

Planned DT is a tip up tail.  I have made preparations for a viscous DT or a Fuse depending on how well either work.  I have also considered the pop off wing if the tip up tail looks to be ineffective.  I plan for this to provide a lot of learning.

Archie Adamisin
Burlington, KY   
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AAdamisin
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« Reply #1 on: October 11, 2020, 12:40:06 PM »

Fuselage build went very quick.  Model is built with 1/16" sq and 1/16" x 1/32" for truss braces.  I really like to use the truss braces to make the fuse rigid to resist twisting under motor torque.  Very little weight penalty for tremendous stiffness.  I plan to use (2) loops of 1/8" or (3) loops of 3/32" SS rubber in this model.  Looking for an aggressive climb to a nice cruise and flat glide until DT.  Every free flight modelers dream right?

More to come.

Archie Adamisin
Burlingon, KY     
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AAdamisin
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« Reply #2 on: October 11, 2020, 12:44:45 PM »

Here are some of the Framed up pictures and covering.  This is my 1st model with undercamber.  Building required a shim under the TE to hold parallel to the bottom of the foil.  This worked nicely and net a nice straight wing.  The tail is quite thin.  I may go to an 8% on the next build and add some truss ribs to resist twisting 

More to come.

Archie Adamisin
Burlington, KY
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AAdamisin
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« Reply #3 on: October 11, 2020, 12:50:11 PM »

Covering the wing took a bit of care.  I used an Elmers glue stick to adhere the tissue.  Carefully rubbing it down until the glue came up through the tissue.  I then used a Coverite trim iron to seal all the edges and make sure the tissue was stuck.  This worked very well on the underside where I glued the tissue to all the ribs.

Now to shrink the tissue in the jig, then apply a coat of 50/50 nitrate dope.

I have to finish the wheel pants, nose block, prop, and then run the DT string.  Very excited to see this done.

Archie Adamisin
Burlington, KY 

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Kevin M
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« Reply #4 on: October 11, 2020, 03:10:59 PM »

Very nice!
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bobson
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« Reply #5 on: October 11, 2020, 03:32:11 PM »

Beautiful design and very precise work! I'm looking forward to hearing about how it flies. What are you thinking about for prop and rubber combination?
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« Reply #6 on: October 11, 2020, 03:56:52 PM »

Looks like a flier! You'll lose this one too!  Pop-off wing is a better option. 

Viscous damper better than a fuse.  A bit fiddly to set up, but more repeatable and less likely to start a brush fire.

They are temp sensitive, but can be easily calibrated on contest day.
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AAdamisin
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« Reply #7 on: October 11, 2020, 05:57:06 PM »

Beautiful design and very precise work! I'm looking forward to hearing about how it flies. What are you thinking about for prop and rubber combination?

Thanks for the kind words.  Going with 8 x 10 wood prop and 2 loops of 1/8".  Used this combo on my Cloud Tramp that is still flying somewhere.  I have glide tested and it seems initially the incidences are where they need to be.  Very flat glide.  As I learned last weekend, doesn't take much lift for these.  CG is 1/4in behind the wing TE.  Lifting tail doing its job.

Archie Adamisin
Burlington, KY   
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AAdamisin
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« Reply #8 on: October 11, 2020, 06:01:01 PM »

Looks like a flier! You'll lose this one too!  Pop-off wing is a better option. 

Viscous damper better than a fuse.  A bit fiddly to set up, but more repeatable and less likely to start a brush fire.

They are temp sensitive, but can be easily calibrated on contest day.

Thanks for the compliments.  It does glide really well. 

I will initially be using the viscous timer.  I'm 3D printing some spools to attempt to get the time right.  Might also be neat to have for tuning on cooler and warmer days as you suggest.

Pop off wing is on my list.  I saw Josh Finn's video of the Maxout and it certainly is effective.  I planned pop off wings for my P30 models for sure.  Need to work out the method for an embryo.

Archie Adamisin
Burlington, KY 
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OZPAF
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« Reply #9 on: October 11, 2020, 07:56:02 PM »

Very nice little model Archie. These small Embryos are interesting - look like a lot of fun.

Just as a matter of interest - why have you made the fuselage so wide in plan ?

John
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AAdamisin
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« Reply #10 on: October 11, 2020, 09:12:22 PM »

Very nice little model Archie. These small Embryos are interesting - look like a lot of fun.

Just as a matter of interest - why have you made the fuselage so wide in plan ?

John

John,

The Embryo rules require a 1.25" x 1.5" x 3.0" box for the fuse.  I lay the box down for a wider fuse.  My opinion wide fuses fly better.  Been my experience in scale.  Seemed to have worked in embryo for me as well. 

Great question.  Thanks for asking.

Archie Adamisin
Burlington, KY
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steveair2
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« Reply #11 on: October 11, 2020, 09:59:00 PM »

Archie, 
This is a very nice looking model you have designed.
Do you offer plans for this model?
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AAdamisin
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« Reply #12 on: October 12, 2020, 07:30:58 AM »

Archie, 
This is a very nice looking model you have designed.
Do you offer plans for this model?


Thanks for the compliment.  I will fly and make sure it is right before I share any plans.  Test glides are very promicing. 

Model weight minus wheel pants and prop is 14.5 grams.  Hope to fly this week.

Archie Adamisin
Burlington, KY
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BG
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Me with F1B - epic retrieval (flew 10km after DT)


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« Reply #13 on: October 12, 2020, 10:18:53 AM »

Hi Archie,
I really like the look of this ship. Would you be open to me kitting it? If yes send me an email ([email protected])

Bernard (of hummingbirdmodelproducts.com)



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F1B guy but its not my fault, Tony made me do it.
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« Reply #14 on: October 12, 2020, 06:35:30 PM »

Thanks Archie. Good luck with your trim flights and don't forget the DT!

John
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AAdamisin
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« Reply #15 on: October 13, 2020, 06:33:35 AM »

Thanks Archie. Good luck with your trim flights and don't forget the DT!

John

John,

Thanks for the encouragement and reminder of the DT.  With the way this thing glides, the DT may only slow the forward speed.  Lol. In glide tests the DT is very effective.

Archie Adamisin
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AAdamisin
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« Reply #16 on: October 13, 2020, 06:03:11 PM »

Archie, 
This is a very nice looking model you have designed.
Do you offer plans for this model?


Steve,

I have not flown this model extensively yet so I would not feel right to offer plans until tested. There is interest in kitting this so maybe that will happen?  I will post video when I fly it with the planned power and prop.

Archie Adamisin
Burlington, KY
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AAdamisin
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« Reply #17 on: October 18, 2020, 10:55:42 PM »

Got more done.  Just a prop and rigging DT and it will be done.  Done some test flying with a 7 x 7 wood prop.  200 winds got little lift and well no more flying until DT is done.

Archie Adamisin
Burlington, KY
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