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Cool hinge cutting tool !!

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S.P.A.D. Aircraft - Coroplast design Discuss the growing area of S.P.A.D.S. (Simple Plastic Airplane Designs). Coroplast type aircraft, pizza box planes, etc..

Cool hinge cutting tool !!

Old 06-23-2003, 08:16 PM
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lomcevek1
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Default Cool hinge cutting tool !!

While building a Spa3D to figure out what all the fuss was about I managed to cut through the whole sheet while making aileron hinges, only to find out I scratched the surface on all of my flight controls !!!

A little pondering and I came up with this idea.

Sandwich two razor blades with the tips ground off between two pieces of balsa spaced so that the blades just fit into one of the holes. Between the wood I glued a piece of kevlar string. you feed the string through the flute and pull the razor blades through the sheet of coroplast. I works great it cuts a nice little slice all the way through leaving a PERFECT hinge with no damage. I am hoping it flies as well as I hear.

I have tried a pizza box and was very dissapointed
Old 06-23-2003, 09:24 PM
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boogerboy
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Default pizza box?

Cool idea! I think pizza boxes are the best! I've had very good luck with them! The most fun plane I've ever flown! What went wrong with yours? Boogerboy
Old 06-23-2003, 09:37 PM
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Default Cool hinge cutting tool !!

Three of us here have tried them and we all have had problems. I think my problem was too much power. It would flex and lose control after I hand launch it it would ROCKET vertically and I just could not control it. I learned later that it is meant to fly at high AOA but I never tried it again.

Almost finished with a SPA3D so i will keep all updated
Old 06-23-2003, 09:46 PM
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Default Cool hinge cutting tool !!

You can;t fly full throtle with a SPAD because they will flex being made outta coro and all!!!
Old 06-23-2003, 09:58 PM
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Default Cool hinge cutting tool !!

"You can;t fly full throtle with a SPAD because they will flex being made outta coro and all!!!"

Absolute Rubish.
A SPAD built to go fast will have no problems with flex, from memory the corodust is good for 90mph with no flex.

the problem is a plane (coro or balsa) designed for slow flight and hovering will not like zooming around the sky at balistic speeds.
as lomcevek1 said
"I think my problem was too much power" and "I learned later that it is meant to fly at high AOA but I never tried it again"
Old 06-23-2003, 10:08 PM
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Graeme Marion
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Default Greetings from Sunny Queensland.

I have flown the PBF with the Thunder Tiger 36 PRO and the Norvel Big Mig 25.

I found the Norvel Big Mig 25 to be the better of the two engines for this model. The Thunder Tiger 36 Pro was heavier than the Norvel and had way too much power.

The Norvel Big mig 25 initially gave me problems with the idle and mid range until I drilled out the air bleed hole in the carby with a 1/16th drill. (The idle used to be too rich.)

I run all my engines on 20% synthetic oil, 10% nitro and use OS number 8 plugs.

I use a Taipan 9x4 prop on the norvel and it hovers the PBF at under half throttle.

The PBF gets flown more than any of my other models. Simply because it can do maneuvers that the others are not capable of. It takes up very little space in the car. It is a cheap quick build and is virtually indestructible.

My PBF has a nose wheel so I never break any props.
Old 06-23-2003, 10:57 PM
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secondchildhood
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Default Cool hinge cutting tool !!

Originally posted by JuniorPilot
You can;t fly full throtle with a SPAD because they will flex being made outta coro and all!!!

Bwahahahaha

Tell that to the guys who have Twin Engines on their coro P 38s.

Not ALL SPADs are pizza boxes.

Dwight Hayden
Old 06-23-2003, 11:20 PM
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Default Cool hinge cutting tool !!

You cant fly a spad at full throttle!! Ha tell Chrisspad that! His coro delta was doing at least 100 mphs or more when i saw it at spadfest
Old 06-23-2003, 11:26 PM
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ChrisSpad
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Default Cool hinge cutting tool !!

tee hee, and it did yesterday as well. Probably closer to 120. It was running right with a Weston Uk. And, my old Coro dino would do well over 120 mph, use to play chase with a pylon plane with it.
PBF's don't fly well at full throttle, due to the flex. I believe thats what JuniorPilot meant to say.
However, not all Spads are PBF's.
Old 06-24-2003, 04:29 PM
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Matt Kirsch
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Default Cool hinge cutting tool !!

PBFs, QHORs, etc. don't like flying fast.

A much simpler flute ripper tool is described on the http://www.spadtothebone.com website. Basically, you screw two hooked carpet blades on to a strip of 1/8" ply.
Old 06-24-2003, 04:35 PM
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theKAT
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Default Cool hinge cutting tool !!

Chris,

You shoulda seen my .20-sized QHOR with the Webra .50 on it going at full throttle.

Karl
Old 06-24-2003, 07:20 PM
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Default Cool hinge cutting tool !!

In defense of lomcevek1's hinge cutting tool design, I've never found that the traditional tool made out of hook blades works all that well. If the flutes are straight up, it's not too bad, but sometimes the flutes are at a bit of an angle, in which case, the hooked blades can snag the inside of the flutes. Further, it takes some skill to use which lomcevek1's device would not. Lomcevek1, can you post a pic?
Old 06-25-2003, 12:02 AM
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Default Cool hinge cutting tool !!

If you could we would really like a picture. Your description almost does it but there are some things I am not sure about. Pic =one thousand words right?
Al
Old 06-25-2003, 12:18 AM
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Johnnylightning
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Default Cool hinge cutting tool !!

Yeah, I think I need a pic too. Sorry lomcevek.
Old 06-25-2003, 12:42 AM
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lomcevek1
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Default Cool hinge cutting tool !!

Iwill try. I am meeting A friend that has A camera and will try to snap A few K.
Old 06-25-2003, 04:12 PM
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Matt Kirsch
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Default Cool hinge cutting tool !!

pinball, I'm not knocking his design. It just seems a little Rube Goldberg-ish compared to the traditional hook-bladed flute ripper.

Personally, I've had very little trouble mastering Tattoo's flute ripper. It's not as difficult or tricky as you make it out to be. Yes, it will sometimes jump out of the flute, but you really have to try to get it to do that. What's tricky is FINDING a Kevlar thread, let alone threading it through 48" of flute. They don't sell Kevlar thread at your local home center.
Old 06-25-2003, 07:04 PM
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lomcevek1
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Default Cool hinge cutting tool !!

You can use dental floss kite string steel wire I just happen to have some kevlar lying around and used it.
Old 06-25-2003, 08:02 PM
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Default Cool hinge cutting tool !!

pinball, I'm not knocking his design. It just seems a little Rube Goldberg-ish compared to the traditional hook-bladed flute ripper.
Agreed. I've never really seen the need for either to tell you the truth, but I love innovation and I didn't want to see an idea dismissed out of hand. Personally, I just take a #11 Xacto, and cut through the plastic between the flutes. Then I fold the coro back on itself, and carefully use the #11 to cut back the little flange back to the flute. It doesn't take much skill, and the advantage is that no matter how the coro is built, you cut every scrap out so the hinge has full motion. It's also kind of fun and dare I say sensual, the way the knife slides through the coro.
Old 06-25-2003, 10:17 PM
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Default Cool hinge cutting tool !!

Ahh yes, why not stick to the tradition of the aircraft design itself. "Simplicity". #11 it'll be fo me as well.
Old 06-25-2003, 11:06 PM
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lomcevek1
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Default Cool hinge cutting tool !!

Pinball HEY that is a good idea as well wish I would have thought of that before I ruined a wing and thought of this little puller. I am meeting my friend later tonight and will have pics posted most likely tomorrow.

I tried it earlier on a piece of coro that had crooked flutes and it worked great looking forward to some feedback and perhaps improvement ideas.
Old 06-28-2003, 04:49 AM
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Default Cool hinge cutting tool !!

Finally here are the pics of the cutting tool
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Old 06-28-2003, 04:50 AM
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Default Cool hinge cutting tool !!

Thread the string through the flutes and pull
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Old 06-28-2003, 04:51 AM
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Default Cool hinge cutting tool !!

Abracadabra
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Old 06-28-2003, 04:52 AM
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Default Cool hinge cutting tool !!

MAGIC
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Old 06-28-2003, 04:54 AM
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Default Cool hinge cutting tool !!

Be SURE to cushion the pointed end of the blade or it could dig into the coroplast.

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