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Very Hot Topic (More than 25 Replies) Scimitar Embryo Build (Read 702 times)
MKelly
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Re: Scimitar Embryo Build
Reply #11 - Jan 28th, 2022 at 9:19am
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Thanks Tom.  The motor is pretty evenly distributed with the current peg location, which is moved about 3/4" forward from the plan's spot.  The CG sits further aft on the fuselage than you'd think due to the wing sweep.

I played around with a scheme based on pictures of Tiger Swallowtail butterflies yesterday.  Printed some test tissue and tacked it on the framework - interesting, but I think it'd be difficult to see in the tall, dry Texas grass.  I'm going to explore other options...

Mike
  

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Sky9pilot
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Stick & Tissue

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Re: Scimitar Embryo Build
Reply #10 - Jan 26th, 2022 at 2:21pm
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Great set of bones. Another great display of your craftsmanship!  I can't believe the tail moment on this model.  Room for a really long motor in that fuselage too. Have you thought of a secondary motor anchor position?  Looks great, can't wait for next posts!
Tom
  

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Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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MKelly
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Re: Scimitar Embryo Build
Reply #9 - Jan 26th, 2022 at 1:39pm
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Fun morning carving and sanding the prop.  Woodwork is all done.  Airframe is 11.6g as pictured.

Mike
  

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0126_Bones_Complete_Left_Rear_Low.JPG
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0126_Bones_Complete_Right_Rear_Low.JPG
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MKelly
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Re: Scimitar Embryo Build
Reply #8 - Jan 26th, 2022 at 9:29am
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Got the noseblock shaped, added a layer of 1/32" on either side of the fuselage to keep the width over the 1.25" spec for Embryos.  If you're building per this plan you might consider adding about 1/16" to the width.  As part of the width addition I sheeted one bay to serve as a base for a viscous timer.  Rigged the gear and sanded the wheelpants to shape.  This morning I started on the prop, which should be the last of the woodwork.  Prop will be 7" dia, 12% blade width, 1.3 P/D - basically the same prop I used on the Super Fike.

Mike
  

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0126_Carving_Prop_Backside.JPG
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Re: Scimitar Embryo Build
Reply #7 - Jan 20th, 2022 at 3:53pm
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Great looking bones...I love that swept wing! The empennage is most unusual!  This is looking like a fun plane!  Smiley

After looking at the wing saddle looks like you can adjust CG by moving the wing back and forward some?   Cheesy Wink
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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MKelly
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Re: Scimitar Embryo Build
Reply #6 - Jan 20th, 2022 at 9:39am
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Thanks guys.  The curves weren't too bad to deal with - they're all gentle enough that the soaked wood had no trouble following the curves.  I only used pins, didn't have to make any forms.

Sanding the wings was more involved than I thought it would be, mostly due to the need to taper the leading edge and turbulator spar towards the tip, and because I wanted to sand a bit of washout into those pointy tips.  A couple hours of relaxing work got it done, and I only popped one glue joint...

Once the sanding was done I cut a couple simple jigs for sanding the dihedral bevel on wing and stab panels, then glued the panels together.  I reduced the wing dihedral from 13 deg to about 10deg per side (personal preference - 13 seemed excessive given the sweep of the wings).  Stab dihedral is 20deg per side in accordance with the plan.

Did a quick mockup last night and took some pictures.  Spindly-looking thing, but I like it.

Mike
  

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0119_Bones_Mockup_Left_Front_High.JPG
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0119_Bones_Mockup_Left_Rear_High.JPG
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staubkorb
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Re: Scimitar Embryo Build
Reply #5 - Jan 17th, 2022 at 12:50pm
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Second Tom's remark about the curves challenge!  At least you only have to "worry" the LE's to final shape Wink!

Really an attractive model!
  

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Sky9pilot
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Re: Scimitar Embryo Build
Reply #4 - Jan 17th, 2022 at 12:30pm
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All those curves have to be a challenge!  I can't wait to see how you accent the shapes with your finish and color scheme! Smiley
  

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Your attitude will determine your altitude!- John Maxwell
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: Scimitar Embryo Build
Reply #3 - Jan 17th, 2022 at 11:43am
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Looking great. The curves remind me of the Whimsey.
ian
  
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MKelly
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Re: Scimitar Embryo Build
Reply #2 - Jan 17th, 2022 at 11:17am
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Thanks Tom.  Worked on the wing and stab this week.  Laminated LE for both.  Spars were soaked for a couple of days, then glued down with SuperPhatic.  The wing uses cracked rib construction, a first for me.  I made a simple jig for slicing the angle on the trailing end of the ribs.

After all the glue had dried I removed most of the pins, then liberally sprayed the wing panels with water.  I'll let that dry for a day to (hopefully) remove any remaining stress from bending the sticks.

In the meantime, I sanded the stab to the recommended airfoil section.

Mike
  

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0117_Stab_Sanded.JPG
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Sky9pilot
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Re: Scimitar Embryo Build
Reply #1 - Jan 13th, 2022 at 12:51pm
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Mike,
You have a great eye for the unusual and eye catching designs!!  I can't wait to see this one come together.   Smiley
  

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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MKelly
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Scimitar Embryo Build
Jan 12th, 2022 at 2:49pm
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My Embryos keep flying away, so I keep building them.  This time it's Florent Baecke"s "Scimitar".  A neat swoopy-looking design by a long-time Alamo Escadrille member who's now passed on.

Started with the fuselage - the aft longerons are laminated from two strips of 1/16"x1/32".  Other than the curves construction is pretty much a standard box fuselage.

Mike
  

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0111_Fuselage_Frame_Assembly_Complete.JPG
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