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FTFC'18 WWII - Ushakov LPL Flying Submarine by FoamyDM

foamtest

Toothpick glider kid
#42
I can't wait to see how this all turns out, If this flies well this could be an option for my winter plane this year.

P.S. I still can't believe that you are not only attempting this project, but juggling around two others at the same time! Very impressive!
 

JimCR120

Got Lobstah?
Site Moderator
#43
Quite possibly the coolest RC project ever! I want to see this happen.

Will you make it FPV? Have you thought of a resurface failsafe just in case?

When this happens, you'll need a separate underwater camera to be able to post a more complete maiden.

I wish you well on this fantastic project.
—Jim
 

nhk750

Aviation Enthusiast
#44
Flying sub

I just saw this thread and this reminds me of the old tv show Voyage to the bottom of the sea with the FS1 Flying Sub.

IMG_3313.PNG
 

FoamyDM

Building Fool-Flying Noob
#45
I thought about nabbing a sub like that just for giggles and maybe an UW camera.

Thank you guys for the support and encouragement. I just hope I can get all these models flying. I really enjoy putting the plans together and building. Can't say I'm great at it specially regarding curvy shapes... and sometimes my eyeballs must be crooked as when I eyeball, it's not always the way it should be. Often when I do, i go back and CAD it out to be symmetrical. You'll see what I mean in the pics below.

Oops signal lost! no worries...
regarding the float fail safe It will be just buoyant and rely on the ailerons/rudder/elevator to move it under the water. if the signal is lost, then the plane stops and floats to the surface, where it should regain control at that point.

FPV cameras...
I was going waterproof the crap out of the $8 teeny boards while protecting the lens. I wanted to set up a "modelized" cockpit with a camera, one in front of the torpedoes underneath and one in/on the tail or conning tower. or if I have a retractable periscope put one on a "telescoping" periscope stick. when retracted it would be at the top of the CT and then it would rise about the water after submerged. obviously on a 3 way switch.

CTanchor.PNG ctanchorplate.PNG cutoutNacells.PNG fuseCThatch.PNG nacell cutout.PNG ready for nacells.PNG setingNacells.PNG looking good.PNG nacellsgluedin.PNG gettingthere.PNG
note the asymmetry here.

What is THIS!?
UW supplies.PNG

The only thing left is the sump pump to bilge out from the floats to the rear.
 
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FoamyDM

Building Fool-Flying Noob
#46
1. Goal is to get it flying.
2. load it to the buoyant level (1200g)
3. Water proof the plane, servos, and electronic. fly it on and off a pond.
4. sink it in a tub.
5. fly, float and sink on a pond.

6. build torpedoes,
7. build UW mines, boat to drive around,
 

foamtest

Toothpick glider kid
#47
I can not wait to see this fly, and hopefully submerge and resurface as well.

Also the asymmetry is killing my aircraft OCD, especially knowing there is a easy way to fix it.
 

DamoRC

Well-known member
Mentor
#48
This is coming together really nice. Also looking forward to seeing it fly / sink / fly and not sink / fly / sink :D

DamoRC
 

FoamyDM

Building Fool-Flying Noob
#49
Nice, wait... Aw Heck!

Thanks.

It hurt my heart last night to finish the glue up and think - damn. The 2 outboard engines will be linked and I don't think it will be a huge issue for the will-it-fly check. but... it might be. I think I may just rebuild the wing.

What easy way? you mean this?


I felt shame as I posted the pic.
Either way I should be able to check if it's airworthy this weekend.

Another fail-safe would be a marker buoy secured in with Tictacs. This method will release every submergence, but in the event SOMETHING goes terribly wrong and the craft doesn't surface, the Tictac dissolves after about 10 minutes and releases the marker buoy so I'll know where to dive down to retrieve the plane.
 

foamtest

Toothpick glider kid
#50
Well the ruler definitely would have helped but I am talking about cutting a new hole for the other engine and patching the wing with some more FB and hot glue. It wont look to pretty but this is a prototype so it doesn't have to be pretty.
 

JimCR120

Got Lobstah?
Site Moderator
#51
A thought on balance... If the pontoons are ever more buoyant than the fuselage then once submerged I'm thinking it will roll inverted.
 

FoamyDM

Building Fool-Flying Noob
#52
The Flip Side.

Well the ruler definitely would have helped but I am talking about cutting a new hole for the other engine and patching the wing with some more FB and hot glue. It wont look to pretty but this is a prototype so it doesn't have to be pretty.
Ah, Patch then re-cut. oh, and measure. I decided on engine placement based on the inside of the aileron was the line to cut for the outside of the two nacells. Clearly THEY aren't symmetrical or I would've been good. Lesson: confirm your registrations are correct before laying out everything else.

A thought on balance... If the pontoons are ever more buoyant than the fuselage then once submerged I'm thinking it will roll inverted.
JimCR120- You are right... I've thought about it. the Floats are supposed to be the first to flood and the last to surface. I plan to have the batteries/ballast will be in the fuselage. and the wings and conning tower have more foam in them and with always thereby be more buoyant.

Progress: Spent most of the night trying to get a Quad Copter running so only a little progress on the LPL-FS... Started installing and hooking up servos. (stop when I had to go into "RC Storage" to find my Y connectors.) G9321B.jpg
 
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Hai-Lee

Old and Bold RC PILOT
#53
You could consider having the airflow to the "tanks?", split per side and under the control of the aileron channel so that you can adjust the buoyancy balance in case of an imbalance in the blowing of the ballast.

Have fun!
 

FoamyDM

Building Fool-Flying Noob
#54
So I understand right, do you mean to divide the plane into two internal chambers and have a Port and Starboard blow valve controlled on the aileron channel? This is to control the roll of the craft as it sink so as not to over-sink one side...

I could If the wings and wing surfaces don't do that on their own. I'll find out I suppose, as I've never done anything like this at all.

if I need it, it's an idea worth trying.
 

Hai-Lee

Old and Bold RC PILOT
#55
IF you find that you have room in your displacement calculations you could fit foam blocks in the wing tips to sort of act as "Outriggers" and stop the roll over except in the most extreme circumstances.

Imagine if surfacing or diving and one pontoon floods and the other doesn't. When the wing tip hits the water the buoyancy of the wing tip will act as a lever and should stop the plane rolling further.For maximum stability all ballast tanks should be mounted as close as is possible to the centre line of the fuselage.

The differential airflow I had envisaged under aileron control would be where the 2 air hoses connect to the main air supply a couple of mechanical "Pinch off" levers operated by the aileron, or rudder, channel so that when roll input is applied one hose is crushed to stop the airflow and the other is fully open, Just a rough method to vary the airflow into the pontoons if needed.

Have fun!
 

FoamyDM

Building Fool-Flying Noob
#56
I think I can... I think I can...

@Hai-Lee - That's a great Idea about the wingtip floats. I assumed the wings will self level any listing as the boat sinks. The Aileron flaps are approx 70% foam. I'm curious to see if they act as float blocks in the situation your describe. I'm thinking of doing a pull-pull plug in the float's step (like a toilet flapper valve), but a mechanical pinch on a hose might work too (or just a simple fold over[kink]). Lastly this will be a flood to sink, and bilge pump to surface.

I'm excited to rebuild this all water proofed and to see it how it submerges.

I'm not sure the Foam will work. When I started putting 1000g of battery together, (my Ballast ball-parking) I was at 3 3S-2200mah. and 1-1500mAh 4S. Which is a LOT for a 28" plane. I'm doubtful the plane will fly with that ballast mass required... I thought it would, and until I get a working model... who knows. But if it doesn't, I've got to think on a few light weight - less buoyant material alternates rolling around. A S.P.A.D. type made from Corrugated plastic board might work (except the need to drain all the corrugations. but could be hard on the shaping, but pretty durable I imagine. another would be 3D printing it. Last would be Aluminum soda or just regular sheeting and spar construction.

In the short time I left myself last night I put together float stands. I haven't glued them onto the wing, as I mull over if they need to have any internal workings this build or not. They Make me happy. To further along I get the more off the engines make the plane.

50 Floats.JPG
51 FloatsBehindFlush.JPG
52 BehindwFloats.JPG
53 FrontEdge.JPG
54 FrontFloats.JPG
 
#57
At the very least it's looking pretty sweet. It wouldn't be super scale, but how about detachable heavy "drop tanks" for ballast?
 

Hai-Lee

Old and Bold RC PILOT
#60
Nice work so far!

You should call it Lazarus after the one that was raised up or is that tempting fate?

have fun!