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I wanna build a bush plane - what's it take?

Old 07-09-2013, 10:43 AM
  #1  
mclarkson
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Default I wanna build a bush plane - what's it take?

I've been feeling the urge to build coming on strong and, today, I hit on something that appeals to me: a STOL bush plane.

When I watch Youtube videos, I see 90% Cubs of some sort with really big wheels.



I'm thinking a basic Cub-type high wing design. Fat airfoil. Flaps. Ginormous wheels and bouncy tires.

What else goes into a bush plane? Should I think about slats? Fences?

Should the motor be monstrously overpowered?

Any suggestions appreciated.
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Old 07-09-2013, 11:03 AM
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CHELLIE
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Big motor and prop for lots of Thrust Big flaps, big wheels and lots of wing area after your done building it, I get to do the maiden Flight

[media]http://www.youtube.com/watch?v=8OD8AFbYZ6c[/media]

[media]http://www.youtube.com/watch?v=GLKVLknTMzQ[/media]

[media]http://www.youtube.com/watch?v=GamUx1wPWkg[/media]
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Old 07-09-2013, 11:07 AM
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CHELLIE
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[media]http://www.youtube.com/watch?v=o1wrhKbZ4uk[/media]
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Old 07-09-2013, 11:27 AM
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mclarkson
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What kinda thrust-to-weight should I shoot for? I don't need it to hover effortlessly, but I want to get off the ground fast.
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Old 07-09-2013, 11:30 AM
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CHELLIE
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Originally Posted by mclarkson View Post
What kinda thrust-to-weight should I shoot for? I don't need it to hover effortlessly, but I want to get off the ground fast.
as close to a 2 to 1 power ratio that you can get, Most of my planes have a 2 to 1 power ratio its fun
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Old 07-09-2013, 11:33 AM
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about a 2 to 1 power ratio on this plane with a 4 cell lipo. in the video the plane was only using a 3 cell lipo, imagine how it is with a 4 cell lipo

[media]http://www.youtube.com/watch?v=lTbir0Uc6Q8[/media]
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Old 07-09-2013, 12:07 PM
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pattern14
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Check out the Fiesler Storch stats and dimensions....it's an old plane, but still one of the best STOL designs of all time. Worth a look, even if it only gives you another direction to go in
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Old 07-09-2013, 03:10 PM
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Scratch, kit or ARF......?......the Beaver obviously comes to mind:

http://www.hobbyking.com/hobbyking/s...FQ9dQgodrk8A6g

http://www.hobbyzone.com/rc-planes-e...Fa9_QgodMWwAzg

http://www.horizonhobby.com/products...-flyer-GWS1030

http://toprcelectricplane.blogspot.c...-flyer-rc.html

http://www.wattflyer.com/forums/showthread.php?t=52062


Just a few ideas Mark........gives ya food for thought.
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Old 07-09-2013, 03:18 PM
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Baloon wheels!
http://www.trexlerballoonwheel.com/
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Old 07-09-2013, 03:47 PM
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BBCorvette18
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the multiplex funcub is perfect stol candidate right out the box. especially with my 3536 1000kv motor and 12" slow fly prop. takes off within inches granted doesn't look scale. been flying it on floats latley not sure if I'll ever put the tires back on
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Old 07-09-2013, 05:27 PM
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kyleservicetech
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Originally Posted by mclarkson View Post
I've been feeling the urge to build coming on strong and, today, I hit on something that appeals to me: a STOL bush plane.

When I watch Youtube videos, I see 90% Cubs of some sort with really big wheels.


I'm thinking a basic Cub-type high wing design. Fat airfoil. Flaps. Ginormous wheels and bouncy tires.

What else goes into a bush plane? Should I think about slats? Fences?

Should the motor be monstrously overpowered?

Any suggestions appreciated.
Yeah, consider going to about 200 watts per pound of airplane. With a big diameter, low pitch prop, take offs won't be a problem. And big flaps to stop the airplane after landing. Just make certain your model is strong enough so the motor doesn't take off, leaving the rest of the model on the ground.

If you've not used one before, take a look at those electric power computer programs such as www.motocalc.com, free for 30 days, then $39.
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Old 07-09-2013, 05:31 PM
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If you want big wheels but they don't need to look like balloons, I have a set of 5 inch dave-brown light-flite wheels on a bipe I have, they come square and you sand 'em with a belt sander to the desired profile.

They are quite soft and absorb bumps well.

I have the only Fokker D-VII bush plane...
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Old 07-09-2013, 06:00 PM
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JetPlaneFlyer
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Multiplex Fun Cub would fit the bill... no?
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Old 07-09-2013, 06:17 PM
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BroncoSquid
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Originally Posted by JetPlaneFlyer View Post
Multiplex Fun Cub would fit the bill... no?
If you take "build a" out of the original header.......yes.
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Old 07-09-2013, 07:14 PM
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JetPlaneFlyer
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Yeah, if putting an ARF together counts as 'building' is a subject for debate
However the consensus judging by the number of 'ARF Build Threads' here on Wattflyer and on various other forums is that it does.
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Old 07-09-2013, 09:22 PM
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mclarkson
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Thanks for the input, guys (and gal).

Yes, I was planning on scratch-building this guy altho I've given some thought to cheating and starting with a naked fuselage from a Fun Cub or Super Cub.

I love those Trexlers, but I'm not sure I can stand to pay the money they cost.

I've looked a motocalc a few times, but it always wants tons of information I don't have so just wing it.
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Old 07-09-2013, 09:56 PM
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I just put multiplex fc wheels on my hz supercub. takes off & lands great in the grass,they do slow the plane down a bit. but hey I'm a rookie still got a lot to learn. I'm just happy to go do some ovals & figure 8s & land with no damage.
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Old 07-09-2013, 10:57 PM
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For cheap big wheels,find a folding baby buggy at a garage sale.remove wheels,throw rest in bin.If they're too heavy,have at it with a dremel to make lighter.They will outlive your plane!
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Old 07-10-2013, 02:56 AM
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CHELLIE
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Originally Posted by mclarkson View Post
Thanks for the input, guys (and gal).

Yes, I was planning on scratch-building this guy altho I've given some thought to cheating and starting with a naked fuselage from a Fun Cub or Super Cub.

I love those Trexlers, but I'm not sure I can stand to pay the money they cost.

I've looked a motocalc a few times, but it always wants tons of information I don't have so just wing it.
IMHO Motocalc will just Confuse the heck out of you Use oz of thrust
for a better way to go, its easier, Belive me Build your plane Minus the power assy, weigh it, get a estimate weight of the power system, add the planes weight and power systems weight for a total weight, Now, Go To Heads Up Rc and look at their motor and charts, it will give you the oz Thrust for a given motor, prop and lipo.assy, find a power systems thats has twice the oz of thrust, say your plane weighs 20 ozs AUW, get a 40 oz power system or there abouts, Easy

http://www.headsuphobby.com/Power-Up...otor-A-536.htm


http://www.headsuphobby.com/Power-Up...otor-E-570.htm
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Old 07-10-2013, 03:52 PM
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Mark....a little off topic, but have you looked at this calc site:

http://flbeagle.rchomepage.com/softw..._imperial.html

I have used it for the Tiger Moth, J3 Piper and Slow Sticks motor and prop combos....has got me in the ball park everytime.....with a little help from my friends.....
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Old 07-10-2013, 09:37 PM
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mclarkson
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Thanks!
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Old 07-11-2013, 04:06 AM
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Hi Mark,

I'm with BBCorvette18 on this one, the FunCub is a great plane for that type of flying and relatively easy to repair should the learning curve turn steep! Once you have your bush wings then risk an nice big modified Super Cub!

And if a FunCub isn't enough of a build for some one they could alway's go this route!

Best regards!

Robin
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Old 07-11-2013, 04:33 AM
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mclarkson
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That's a sweet plane. Where's it from?

This is about my 30th plane, BTW, so I'm not too worried about the learning curve. I cut my teeth on a Cub.
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Old 07-11-2013, 05:33 AM
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Sorry, I should have realized that from the number of posts, etc.

It's my 'slightly' modified FunCub! It all started with a crash of my original FunCub and a healthy interest in the Valdez, Alaska Bush pilot competitions! It's been an experience but I learned alot from it. To make a long story short I remaidened it (flew great) and then lost her the very next day! After sitting in the spare room for eight months I decided to give her another shot - and this is where I'm at with her. Just waiting on a set of e-flite J-3 Cub struts to arrive so I can finish her up!

Robin
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Old 07-11-2013, 04:59 PM
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I love the tube fuselage Robin Did you solder that out of brass tubing Take care and have fun, Chellie

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