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FTFC20 - Vought OS2U-3 "Kingfisher" by FoamyDM

FoamyDM

Building Fool-Flying Noob
#21
Can you help?
What have others done to make a Canopy?

Build Concern and Plan notes so far:
I am worried that the landing pontoon-to-fuse connection being weak. During a hard landing, I suspect it will damage the fuse. also the holes marked on the plans for this purpose are not in the right location along the fuse or sized correctly. lastly the H-stab slot is not the right length width, or pitch. the pitch is the biggest concern. The rounded fuse is new for me, and without 3d modelling I'm not sure how to to line it up correctly. other than eyeballing my fix, and the mirror command.
The foam canopies did well, but I would like advice on how to make the canopy for this bird.

More History:
In addition to their usual scouting and gunnery observation roles, OS2Us were also used extensively as rescue aircraft, picking up downed aviators on the sea and bringing them back to the fleet. Most famously this capability was demonstrated during the raids on Truk during 1944, when dozens of pilots and crew were retrieved by Kingfishers.
 

FoamyDM

Building Fool-Flying Noob
#22
Paying more attention to the pontoon now that I know the pieces form together well

1579206404090.png

This triangle is half as wide as the distance from the front to middle vertical struts. Also Note the Diagonal braces from the pontoon at the front 2 v. struts to the 4 and 8 o'clock fuse points. (I'm thinking small thin rubber bands, skewers, or the thin wooden stirrers. then there is the tail wheel and rudder...
Open canopies:
 

K3V0

Elite member
#23
I’ve got limited experience here, but I’ve recently completed the Edge and it has a molded canopy. I suspect all the MS warbirds will have something to lend. Or modify the mustang or mig poster board canopy. Ooh, @Grifflyer made a sweet Razorback mustang, modify those? Honestly though, your hanger seems to have dozens more than I’ve attempted I feel kinda silly proposing options to you😋
 

FoamyDM

Building Fool-Flying Noob
#24
@K3V0 , the foam version I"m ok with I meant for a clear one. Of you come across one, help me out please

Worked on the kingfisher.
Shoored up the nose with a power pod sleeve, add the rubber bands... (I'm not convinced).
IMG_20200116_205403676.jpg IMG_20200117_000104576.jpg
Servos installed.
IMG_20200117_000112147.jpg IMG_20200116_225829857.jpg IMG_20200117_000118103.jpg IMG_20200116_225852500.jpg IMG_20200116_230036748.jpg IMG_20200116_230027134.jpg IMG_20200116_230100086.jpg IMG_20200116_230046012.jpg
And worked on the side pods.
IMG_20200117_000418501.jpg
Electronics almost down. Balances as is, no batt.
IMG_20200117_000057773.jpg
Almost done and ready to maiden.
 

K3V0

Elite member
#25
@K3V0 , the foam version I"m ok with I meant for a clear one. Of you come across one, help me out please

Worked on the kingfisher.
Shoored up the nose with a power pod sleeve, add the rubber bands... (I'm not convinced).
View attachment 154908 View attachment 154910
Servos installed.
View attachment 154909 View attachment 154912 View attachment 154913 View attachment 154914 View attachment 154916 View attachment 154917 View attachment 154918 View attachment 154919
And worked on the side pods.
View attachment 154911
Electronics almost down. Balances as is, no batt.
View attachment 154907
Almost done and ready to maiden.
How about some of @nerdnic’s canopy designs? The chipmunk v2 could be modified to look like the longer one the kingfisher has.
 
#26
@K3V0 , the foam version I"m ok with I meant for a clear one. Of you come across one, help me out please

Worked on the kingfisher.
Shoored up the nose with a power pod sleeve, add the rubber bands... (I'm not convinced).
View attachment 154908 View attachment 154910
Servos installed.
View attachment 154909 View attachment 154912 View attachment 154913 View attachment 154914 View attachment 154916 View attachment 154917 View attachment 154918 View attachment 154919
And worked on the side pods.
View attachment 154911
Electronics almost down. Balances as is, no batt.
View attachment 154907
Almost done and ready to maiden.
That looks AWESOME!!!
 

FoamyDM

Building Fool-Flying Noob
#28
I will likely have to do something better with a stronger connection to the main float. otherwise it is finished and ready for a maiden!
IMG_20200122_021817929.jpg IMG_20200122_021819598.jpg IMG_20200122_021808879.jpg IMG_20200122_021758843.jpg IMG_20200122_021743351.jpg IMG_20200122_021743351.jpg
IMG_20200122_021736814.jpg

It's ready for a hand launch. and some paint. (and the front cowl.)
I will post the resource, and cross my fingers. video pending, and resource confirmation likely tomorrow.
 

FoamyDM

Building Fool-Flying Noob
#31
I flew this plane yesterday! :D shortly:cautious: like a squirrel:eek:
It was unfortunately tail heavy. and stayed up in the air, for maybe 3 seconds. the steady breeze exaggerated the touchy corrective movements. More importantly, the video facing the wrong way, and filmed the concrete pad the tripod was sitting on. :mad: In the video you can hear the motor rev, and my comments about it flying, shortly. and the crash not being so bad. (not sure it's enough evidence.) The second attempt revealed a flaw in the design. I did not put formers in this build, except in one spot. When it crashed, the paper removed sections, didn't have enough strength and the nose crumpled, and cowl tabs
While it looks bad, (parts strewn about) it looks like it can be fixed fairly quickly.:)


Takeaways:
  • Strengthen - design in more paper backing and another float skewer internal anchor.
  • CG refinement - the 2200 Mah 3S battery should be just at the cockpit backwall, not through it, for balance.
  • Flaps.
 
Last edited:

K3V0

Elite member
#32
Thats cool you were able to get it aloft! Did you take off of grass? The experimental phase is fun and I think I’ve always learned deeper lessons as I’m piecing together both the plane and the reason things went wrong.
Don’t stress the camera, man! Seems like you were focused on the right thing.

Flaps!
1580490389015.gif
 
#33
editor_20200422_171557.jpg
I still had to master the niceties of RC building, and especially flying, but in the meantime here is my Kingfisher, built from 1/2 in thick craftwood- actually a plank from a throwaway wood palette. It flies about just as badly as it floats, but it looks quite spiffy on the shelf in our guest room.
editor_20200422_171840.jpg


The 'jungle' by the way is the palm tree in our garden.

editor_20200422_172413.jpg

Scale is 1/36 at which all of the parts can be printed on a single sheet of printer paper. So span and length are about 10 inch.

If I ever get serious about re-entering RC flying, and I would be good enough not to crash it, my layout would be a flat-sided foamie of either scale 1/24 or 1/18 with a simple 1-sheet slightly curved wing and lots of silkpaper-covered cutouts to keep the weight down and the flying speed low.
 

FoamyDM

Building Fool-Flying Noob
#36
Thats cool you were able to get it aloft! Did you take off of grass? The experimental phase is fun and I think I’ve always learned deeper lessons as I’m piecing together both the plane and the reason things went wrong.
Don’t stress the camera, man! Seems like you were focused on the right thing.

Flaps! View attachment 156353
I know I didn't mention this when it was posted, but that is a GREAT animated picture of the Name-sake doing what it does!
The Kingfisher is a interesting Bird. And I really do find it striking
 

K3V0

Elite member
#37
Thanks man! It really is a cool bird. I’ve barely been on the forum this year but I’m still building! Hope it’s been fun and you’ve gotten to fly a lot. 😄