OK, unless someone else says different, I want to claim the BIGGEST PBF, at least for now.

Span: 56 Inches!!!

Weight: 7lb, 3oz

Wing Loading: 5.3 oz/sqft

Engine: very old Irvine .61 (before it seized up)

Construction: Pink foam from Home Depot

Builder: Gordon Barcomb, Bald Eagle RC Club, Tulsa OK

Pit Crew: David Harris, Tom Harris, James Scraig

Believe it or not, it flew very well!The 60 ran poorly, all 3 landings were deadstick, but this thing is a floater. Climb out was very much like a C-130, slow and steady, looking very large. 10 MPH wind was no problem, and made the landings at zero ground speed. We had a great time, and I think the OS .50 sx I have waiting for the newest Somethin' Extra will power this for a while.

See the pic!

Now I bet that would be cool to see!!!!!!!

Great job Gordon!!!

I'd be willing to bet you now own the record for the biggest PBF.

And I'd also be willing to bet that you may have triggered someone else to make an even larger PBF.

Let's see.......take two 4'x8' sheets of foam.......join them together to create an 8'x8' PBF............OH! WAIT!......take four 4'x8' sheets of foam.........join them together to make an 8'x8'x8' X-Box...........

Actually, 7 lb aint bad for a 60 sized plane, especially a glider! If you mean hover as in 3D, no, not even a little bit. But it will hover in the breeze, even fly backwards if you do it right! Video is coming, have to have a friend make it digital. I got the 1st launch, a bit in flight and the first landing. My wife couldn't track it very well as she zoomed in too much. But at least she was there. An informal poll showed 3 out of 14 poeple present acually believed it would fly! Here is a pic of the prep.


Gordon

did you have to make control horns or did you use regular horns?
how much deflection did you have on the tail?
which servos did you use?

Jason

Mine is a 48" stop sign made from blue foam from Lowes, covered with econocote to look like a stop sign. Ad an OS91FX and wow what an absolute blast!!!!!!!!!!!!!!!!

Hey VANMAN you copied mine!!!!!!!!!!!!!! LOL

Just when you think you've seen it all, BAM! there's something new.

Now that's big!!

Cool stop signs as well!!

Now, how about a giant flying saucer!


Don

Ive still got a G62 to put on one, How big of a PBF do you think I should make to hold a G62? And hover

John,

You'd have to come up with a new style of plane for that engine. It'd be called BBF..... Billboard Flyers!

Mike

Yeah I suppose, sure would like to do it, maybe a sheet of this plywood????:rainfro:

Hey JohnVH the hood on that mustang might work.

Um, no!

I flew it again today with my OS 50 SX, funny to have a $150 engine on the front of a $10 piece of foam! 2 flights to an empty tank, about 10 minutes each. The flight is a combination of BIG glider and ultra light trainer. I was flying backwards under power in a 10mph breeze, every landing has been zero ground speed.

There is no lateral flex because the leading edge is a 2x2, and a piece of plywood. (way tailheavy plane, needs lots of nose weight so I thought I'd make use of it!), but front to back, it's annother story! You can watch it flex as you do a nearly motionless fly by, and "high speed" dives are not a good thing, not enough elevator to recover without slowing down.

It's not the every day at the field plane, but it was fun. I'll keep working around the problems, and try to get it flying even better. I have lots of ideas.

As to flying the 4x8 sheet of Coroplast, that's one heavy, flexing plane! Maybee you could get it to flap in the breeze, and fly like a bird! A full sheet of insulation foam weighs less than 4 lbs.

No one has asked about transporting a one piece plane that's nearly 5 foot across. Thank goodness for the motorhome!

Gordon

Oh, on the horns: 3/8 by 2" sticks of 1/8 plywood epoxied into the foam. Throws? All I could get, and that's not enough, so I'm working on more. Servos are Fut 3004s, but if I keep flying this thing I'll put higher torque ones in, they won't last a long time with surfaces that big!

Gordon

Where is the CG?


Francis

Holy time warp.

Is this almost an 8 year old thread??????

Pretty cool.

Wow! A Phoenix thread rises from the ashes after being dormant for 8 years.

CG should be between 20 to 25 percent of chord......no matter what size PBF you build.

Will I need stronger servos for a 40" to 48" pizza box?


Francis

Standard servos should work fine since the bigger a PBF gets......the more it tends to fly like a kite.

I thought Gordo got banned back when the year started out with "19"???

Banned.....but not forgotten.

GORDO! The man who got the infamous "Rule 9" repealed.

Word My Brotha!!!!