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Cadence - F3A Prototype

Old 02-24-2015, 04:11 PM
  #1  
Fixed Wing
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Default Cadence - F3A Prototype

Pictured are foam cores for a new Mark Hunt design prototype called the Cadence. Mark along with some friends (and lots of beer) cut the cores. A kit was laser cut for Mark Mendonca who is building the fuse and finishing it out along with its setup. My part in this is to prepare and sheet all of the foam parts. Given the extensive amount of coring/drilling in the various pieces I thought people might be interested in seeing a few pictures.

Dean
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Old 02-24-2015, 04:41 PM
  #2  
flywilly
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Hi Dean,
Thanks for the post. I saw the 3d CAD rendition of the Cadence on Mark's website in the 'area 51' section and thought it looked very good. I am hoping that it will be kitted for glow as well as the ubiquitous electric power.
How was the wing honeycombed? The holes are very neatly arranged - laser cutter?
Looking forward to this build; I hope you can include the fuselage construction, too.
-Will
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Old 02-24-2015, 05:56 PM
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Hokey smokes Bullwinkle, I think you found the Swiss Cheese

I too am interested in the coring process. How much weight was removed?

Ken
Old 02-25-2015, 03:08 PM
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Fixed Wing
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This will be Mark Mendonca's plane and he will be setting it up as electric.

The foam coring was done using a CNC machine. The cores were not weighed prior to drilling so I can't determine how much weight was saved.

In raw form the wing panels appear very delicate. However, after sheeting several drilled wings like this from Mark before they all have turned out quite strong when completed. The wing panels as shown in the pictures are currently match sanded to a weight of 110 grams each. This includes the core with tube socket glued in, end of socket sub-rib, trailing edge sub-rib, and carbon fiber on top & bottom.

I can post more pics of the sheeting process & resulting weights if desired.
Old 02-25-2015, 04:08 PM
  #5  
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Please do. I am very interested in the process.

Sheldon
Old 02-27-2015, 09:00 AM
  #6  
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Made a little more progress. Following are descriptions for each picture:

1) Balsa sheeting edge trued, taped together, and shaped to size for each of the foam pieces.
2) Slow cure epoxy with added red dye applied to each of the skins.
3) Added coat of epoxy over CF strips on the wing cores.
4) Everything in the vacuum bags under 6.5 In Hg.

All foam parts will cure in the bags under vacuum for 24 to 30 hours.
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Old 02-27-2015, 10:07 AM
  #7  
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Hello

I like the design.
Have you others pics of the Cadence ?
Claude
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Old 02-27-2015, 03:35 PM
  #8  
Fixed Wing
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Mark sent me some CAD drawings to share.
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Old 02-28-2015, 02:02 AM
  #9  
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Hello

Thanks a lot for these drawings.
I'm very please to see a Yamada on the drawing.
Claude
Old 12-24-2015, 11:43 PM
  #10  
rm
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I hope Mark won't mind, but I thought I'd post pics of my build since there's not much out there about this plane.

Setup will be....

DA35
carbon pipe
50mm drop header
S9570sv on ailerons
S9470SV on rudder
S9670sv on elevators

I'm planning to mount elev and rudder servos in the tail via sbus. Motor will be hard mounted, moving the firewall back for a soft mounted gas engine would require some extra work. A soft mounted YS would fit perfect. A hard mounted gas engine is pretty much the same length as a hyde soft mounted YS.

The kit is proving to be very nice. All the wood is provided for the entire kit and all parts are laser cut. 1/16" sheeting 3x36, all sheets weighted between 6-8 grams. Foam wings, stabs, rudder, turtle deck, canopy, and belly. 7/8" wingtube. I really like this type of kit. Parts fit has been excellent.
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Old 12-25-2015, 08:02 AM
  #11  
maustin
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Nice to know a YS will fit without mods !! Look forward to this build thread.

maustin
YS Engines - love'm or list them
Old 12-25-2015, 08:06 PM
  #12  
rm
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Will be heading back to some foam work.
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Old 12-26-2015, 05:04 AM
  #13  
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I LIKE IT!!!!

Bill Holsten


Originally Posted by Fixed Wing View Post
Mark sent me some CAD drawings to share.

Last edited by AmericanSpectre505; 12-27-2015 at 05:07 AM.
Old 12-26-2015, 11:46 PM
  #14  
rm
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Contact and pricing can be found on Marks website

http://insightrc.com/insightrc-Cadence-orderpg1.html
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Old 12-26-2015, 11:56 PM
  #15  
rm
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For YS motors

Here's a pic showing the 821 hatori pipe.

Photo of firewall. Rt thrust offset and center line is all predetermined for you. Plus the rt thrust is already built into the firewall.

Front plate, if you notice the 2 small circles just outside of the center hole, marks the drill point for your nose ring. I think it fits the one central sells, at least that's the way it was on the pentathlon. I've enlarged the center hole for my gas motor.
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Old 12-28-2015, 09:24 PM
  #16  
rm
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Inner fuse is all framed up, Went over all the glue joints again and used thin ca inside the front nose to harden and really set the firewall.

Started adding the 1/8" sides. Attaching the front halves first with gorilla glue. Will ca the back halves to the frame once the front has a chance to setup.

Fiberglassed the bottom outside floor for strength and fuel proofing. Only have the turtle deck to skin yet and then all fuse foam parts will be ready.
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Old 12-28-2015, 09:59 PM
  #17  
drac1
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Hey rm,

Any final weight predictions?
Old 12-28-2015, 10:34 PM
  #18  
rm
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As long as it's under 11lbs I'll be happy and I'm sure it will come in under that. I'm guessing 10.5 to 10.75. I'd have to ask Mark what they've been coming in at. I think the prior builds were electric.

The fuse as it sits now is very light, but I haven't weighed anything yet. Mine will be all monokote with the canopy and chin cowl fiberglassed and painted.
Old 12-30-2015, 12:13 PM
  #19  
flyintexan
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RM,

Looks like you are doing a fine job with the kit!
Only 1 Cadence is flying at this time. I know of 3 other kits that have been purchased including yours..one of which is nearly complete.
I have been flying and experimenting with the first prototype built by myself and a good friend. He flew it to 7th place in Masters at the US Nats back in July.

The design concept was to allow nearly any powerplant to be used and to give the builder a bit of a blank canvas to work with. Minor changes to the fuse profile etc. are quite easy to suit one's taste.
The proto I am flying is very light (foam coring as seen in first posts I'm sure helped) and powered currently with a Scorpion outrunner...it has also flown for testing reasons with a NeuF3A.
I will say that the proto flew very well without any fins and/or canalyzer mounted in the canopy. This is the way it was flown at the US Nats. We attempted using a canalizer and found it did not suit my taste..very yaw and pitch sensitive. We have since applied a simple fin atop the canopy and below the belly, both slightly aft of the cg. Testing so far in this configuration has yielded a very sporty "F17" airplane, although now I would like more a pinch more yaw stability...kind of a give and take with any plane capable of the newer FAI maneuvers. I will be updating the design slightly sometime in 2016'.

Happy new year,
Mark
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Old 12-30-2015, 04:21 PM
  #20  
rm
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Main fuse frame is pretty much complete. Now starting to add the peripheral parts.

Chin cowl is built on a break away crutch. On the last 3 formers you can see where they will snap apart after sheeting is added. I did some rough shaping now, will finish once I get it attached to the fuse and I can do the whole nose at once. Have to also open up the front for cylinder cooling.
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Old 12-31-2015, 04:50 AM
  #21  
maustin
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rm,
how will the cowl attach? It looks flimsy at this point.

Thanks,
maustin
Old 12-31-2015, 10:03 AM
  #22  
rm
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It's actually fairly strong.

I've been thinking about that. I'm gonna use 3 4-40 bolts. 1 on each side and 1 in the front. This is something that shouldn't need to be removed that often.

I'll prob be working on that tonight.
Old 01-01-2016, 12:12 AM
  #23  
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fuse work
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Old 01-01-2016, 12:48 AM
  #24  
rm
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Here's how I'm doing the bottom cowl.

I added an inside lip to each side with a mount with a 4-40 blind nut.

In the cowl I took 2 1/16" ply pieces and made into a 1/8" insert. Between the ply pieces I added a 4-40 washer to keep the ply from wearing. The cowl siding is 1/8".

Later I'll add a 3rd bolt to the front center after shaping and sanding the front end and after I've cut out my air intake for the motor.
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Old 01-01-2016, 10:56 AM
  #25  
MTK
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Originally Posted by flyintexan View Post
RM,

Looks like you are doing a fine job with the kit!
Only 1 Cadence is flying at this time. I know of 3 other kits that have been purchased including yours..one of which is nearly complete.
I have been flying and experimenting with the first prototype built by myself and a good friend. He flew it to 7th place in Masters at the US Nats back in July.

The design concept was to allow nearly any powerplant to be used and to give the builder a bit of a blank canvas to work with. Minor changes to the fuse profile etc. are quite easy to suit one's taste.
The proto I am flying is very light (foam coring as seen in first posts I'm sure helped) and powered currently with a Scorpion outrunner...it has also flown for testing reasons with a NeuF3A.
I will say that the proto flew very well without any fins and/or canalyzer mounted in the canopy. This is the way it was flown at the US Nats. We attempted using a canalizer and found it did not suit my taste..very yaw and pitch sensitive. We have since applied a simple fin atop the canopy and below the belly, both slightly aft of the cg. Testing so far in this configuration has yielded a very sporty "F17" airplane, although now I would like more a pinch more yaw stability...kind of a give and take with any plane capable of the newer FAI maneuvers. I will be updating the design slightly sometime in 2016'.

Happy new year,
Mark
m
Mark,
what size holes and what spacing were used on the foam parts? It's one way to remove foam. In past builds years ago I used a 1" ally tube fashioned into a boring tool and hand bored. A real tedious pain but it worked okay. Yours look smaller than 1". How much weight removed?

Would you tell me what are your wing, stab and fin areas?

RM, excellent job on this build. I'm following your progress.

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