OzMo

My Feedback: (3)

I agree wheels are not needed. However it would be just darn funny to taxi out and line up for a take off and just pop straight up[>:]

davidgeorge212

Hey guys, I got inspired to make a pbf flyer and started on one tonight. I need some opinions though. I havent really searched for that cloroplast sign board and I threw away all my presidential campaign signs so I dont have any of that lying around. I think I know of a sign place close by if my fowlowing options wont work. Any way I wanted to see what you would think of my plan. Instead of that chloroplast board I had some lightweight 4x8 sheet of that insulation styrofoam board that is just about an inch thick. Its pretty light but I dont have the other material to compare it to so I dont know how it is for weight wise, I imagine pretty close. I was just going to paint it then cover it with clear packaging tape to protect it as much as possible. I made the motor mount out of oak and the back bone or spine down the middle out of pine. I am planning on putting an old os 25 on it to start off with and go from there. I could even shape the wing into a nice airofoil since it is 1 inch thick if need be. Do you think my setup will be ok or should I just go down and keep looking for cloroplast board?


Thanks, David G.

Steve108

My Feedback: (36)

I built an electric PBF with foam. Here are some pictures. It didn't fly too great, is was way underpowered. Yep, brushed motor and NiCd's.

I can't see any reason why the foam would not hold up to glow power, JK aerotech kits combat planes out of that stuff. You reinforce them with strapping tape and then cover with packing tape. Works great, and they are tough. Check out there website jkaerotech.com for a good way to do hinges if you decide to try this. I'd also reinforce the foam with strapping tape like they do.

1" sounds thick to me, considering coroplast about a quarter of that. If you could cut it in half that would probably be a good place to start. Try it out. An airfoil is not really necessary. You could round the L.E. though.

Personally, I would just get some coroplast. It is really inexpensive and even if the sign shop doesn't have any you can order it online.

Good luck,
Steve

John Wells

My Feedback: (10)

Sumbody nearly killed my original PBF in Eldon MO this year during PBF combat. I'm building two more.....[>:]

Dave McDonald

My Feedback: (19)

Yep, that was fun!

Here's a photo of my blue 40FP PBF toying with the mortally wounded prey.

RC MANIAC119

My Feedback: (14)

Dave

You're over-thinking it!!!

Use Dave McDonald's plans, they're free! Forget about the airfoil and the styro, it's too fragile and complicated. Just stick with what works! You'll have a lot more fun if it's indestructable!!!

Dave McDonald

My Feedback: (19)

DG,
Yes, a foam PBF will fly.......but probably not as well as a coro PBF.
Plus a foam PBF definitely won't survive the constant abuse that a coro PBF can take.

Hey, half the fun of flying a PBF comes from the pure lack of fear of crashing. You'll break props......lots of props......but otherwise a coro PBF is pretty much indestructible.

Steve108

My Feedback: (36)

Yea one crash with my foam one destroyed it.

davidgeorge212

the only reason i was suggesting the styrofoam is because thats what I had. the coro board is harder than you think to come by at least where I live. I finally found a little sign shop next to where I work who sold me 3 sheets 24 x 36. the coro was a little more expensive then I originally thought it was going to be, It cost about 6 dollars a sheet for 24 x 36. BUt never the less I got some and I will make it now according to plans. I will have spare to if I crash it to bad.

John Wells

My Feedback: (10)

But....some brands of propellers will tend to chew the coro up and leave gashes

Dave McDonald

My Feedback: (19)

That's true. []

Thanks to the prop on JW's PBF, my PBF now has see-through windows. [:@]

toywizard

Love the "See through window".........lol

Right now I am into EPP foam with brushless with lipos but I have a PBF sitting on top of one of my Bridgeports waiting for the next urge. COro is great~ Bluecor is cool. Depron is also cool.....I have planes and ufos (lol) built out of all material.

You just got to try diff stuff and see how it flys. As long as it is fun................then just do it. I have even built crap out of cardboard, ya, real cardboard.

If its not fun........stop and re read this forum and find a part of it to follow and try.
Last weekend my son and I made 4 rockets out of christmas wrapping rolls and easter eggs for nose cones. Had a ball. made the fins out of foam meat trays and hot glued all together. What a blast.

Just toss somthing together and try it. If it don't work, try something else.

RC Universe is the greatest place of combined info in the world.............read tons, ...........ask only when needed........and create often.

I even hot glue together the wally world foamies just to have fun..........

Steve108

My Feedback: (36)

I built a new PBF last night.
OS 40 FP, Futaba 3003 servos, JR600 RX, 700mAh NiMh battery.

Take a look at my rudder, I made it like that because when the elevator/aileron stick is in the lower corner, the elevons move that far. Elevator only is 2" of throw, and same with the aileron. When you do them at the same time is moves a lot farther.

Do you think this will have enough rudder authority or should I change something? Its easy enough to change the v-stab and I rather do it now since I can't fly it until next week. What do you think?

toywizard

Looks like way more throw than you need but she will do some serious 3 D for sure.................I would cut back on your throws a bit.
I always had a prob with over control and the next thing I knew..........WHam! I was in the ground for sure.

RC MANIAC119

My Feedback: (14)

Set the throws Exactly as McDDD states, and you won't be disappointed!!

Steve108

My Feedback: (36)

So do I want 2" when the stick is in the corner? Or just straight back?

Dave McDonald

My Feedback: (19)

You want 2" when the stick is staight back......AND you want 2" when the stick is in the corner.

If you have a computer transmitter, just follow the instructions on my PBF web page:
http://mypage.yhti.net/~dmcdnld/pizzabox.htm

If you don't have a computer transmitter, then you're pretty much stuck with the way you have them now.

toywizard

I stand corrected.

Maybe it was the heavy gravity up here. lol
I mean It couldnt have been ME ? lol

wingspann

I have a number of coroplast signs, and the thought occurred to me to try to fly one. The PBF looks like a good starting place, but mine would be rectangular with a 4' span and 2' length. The flexibility of the 4' span of coroplast will require a spar of sorts, but aside from that, what other problems am I likely to encounter?

I have a few brushed motors, the largest of which is a Speed 500. Would that handle my flying sign?

Thanks in advance
John

toywizard

lol

It prob will fly like my "Bluecore Magic" did. check out the youtube vid....


http://www.youtube.com/watch?v=-VOzZ9ikWKU


twwrc.homestead.com


It was really weird to fly, kind of a floater. lol
I got a 4'x8' sheet of coro from my local printer and its ok to make stuff out of but I still like foam better.

RC MANIAC119

My Feedback: (14)

Wingspann....you should really stick to the original plan, you have enough Coro..to make 2 of them!! A four foot span is going to be mighty heavy........

Make the first one 24x24, have a ball, get used to the way they fly........and THEN experiment!!

I'm just sayin....

wingspann

Probably good advice, but I don't want to split a sign I paid good money for. I'd rather try to dance my "Vote for Me" sign in front of bewildered prospective voters IF I can make it fly. I've about decided to go for a beefy outrunner motor for its better power to weight ratio.

I'll let you know if it ever gets off the ground.

John

layback2

My Feedback: (12)

WOW long thread seen plenty of changes from day one from glow to foam and cora i have a gws easy bug hardwere kit was thinking of building a small version and see what it will do good topic love the new designs

wingspann

Well, it''s finally built and flown! I decided to go with a brushless outrunner to be sure I have enough power. The 4' span of coroplast being pretty flexible, I added a 4' spar of 1/2" aluminum angle with a couple of CF tube diagonals to stiffen the trailing corners. Instead of going full-width with the elevons, I made them 16" long on each side, leaving a 2" section between them solid and about a 7" section at each tip solid for it to stand on. The vertical fin is 8" square instead of 6", but the rudder is still 3" X 6". That''s the third leg for it to stand in the display position.





With more practice I hope to be able to make vertical takeoffs from the display position. I added a wire bow to each tip to keep the prop off the ground on landings.

Now maybe you can understand why I didn''t want to cut the coroplast into smaller pieces!

Video added.... http://www.youtube.com/watch?v=okuNCmv_Q9c

John

Goinstraightup

My Feedback: (26)

That''s really cool John, and good luck[8D]

I had my old beat up one out last night. I was getting in some looong tail drags. This "plane" is sooooo much fun.