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Old Mar 12, 2005, 09:21 AM
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Vicksburg, MI
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What would be a lighter 1/12 scale P-51, balsa or foam?

I will probably be building a scale 1/12 scale P-51 but not sure about the best way to go about doing so. Should I go for balsa built up construction or vac-formed 2mm zepron wing (upper/lower) and fuse halves? I am looking for an AUW under 19oz. I am confused by a couple things. The GWS P-51 is pretty much a solid hunk of foam yet can usually be built under 15oz. The Hobby-Lobby P-51s are vac formed foam and way just as much. I am not trying to build a scale plane to fly often, just a highly detailed scale plane that may I fly once or twice and only for a few minutes at a time. Assuming that the power system and battery together might weigh a total of 3.5-4oz, and the radio equiptment will weigh less that 1.5oz, that gives me a lot of airframe weight to play around with.





-Daniel
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Old Mar 12, 2005, 10:07 AM
Motors beat engines!
Milwaukee Wisconsin, United States
Joined Feb 2001
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For a given weight level, foams tougher, especially if you use a bit of wood in the right areas, like wing spar caps and longerons.

Jkaerotech builds their gasser combat 1/12 scale warbirds this way, and I'm here to tell you they're very tough. I ran my jk ta152 out of juice over a 40 ft high treeline, wound up crashing through all the way to the ground at 50 mph plus, breaking branches all the way down. The only damage was a stripped rudder servo.

Everyone there could'nt belive I was flying again after locking the rudder straight and as recharge.

Yours will be built much lighter than mine, but this construction method is tried and true.
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Old Mar 12, 2005, 10:09 AM
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Vicksburg, MI
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Quote:
Originally Posted by DeaninMilwaukee
For a given weight level, foams tougher, especially if you use a bit of wood in the right areas, like wing spar caps and longerons.

Jkaerotech builds their gasser combat 1/12 scale warbirds this way, and I'm here to tell you they're very tough. I ran my jk ta152 out of juice over a 40 ft high treeline, wound up crashing through all the way to the ground at 50 mph plus, breaking branches all the way down. The only damage was a stripped rudder servo.

Everyone there could'nt belive I was flying again after locking the rudder straight and as recharge.

Yours will be built much lighter than mine, but this construction method is tried and true.
Could you post a pic of yours?


-Daniel
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Old Mar 12, 2005, 02:24 PM
Motors beat engines!
Milwaukee Wisconsin, United States
Joined Feb 2001
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Here you go, pics of my jk warbirds, p-51, zero and ta152.

These are all built much heavier than what you're thinking of though, about 50 oz RTF with 8 gp3300 cells and endo power. Fast though, all do well over 60 mph.


Dean in Milwaukee
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Old Mar 12, 2005, 02:54 PM
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Vicksburg, MI
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So even at 50oz it flies? That's amazing. What's the wing area? Mine will be
243 square inches. So I'm guessing that even at 20oz mine will fly and fly well.



-Daniel
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Old Mar 12, 2005, 03:28 PM
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Orebro, Sweden
Joined Oct 2002
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1:12 glowpowered aircombat planes generally wheigh in at around 35oz, and are powered by a .15 to .25 glowengine. So, I donīt think you need to worry too much about an AUW of around 20oz, as long as you have sufficient power. It may not be what most people would consider a parkflyer though!

Anders O
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Old Mar 12, 2005, 06:35 PM
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Balsa Flies Better...........

Never liked foam......Always built from balsa... but, that's just an opinion. If You want a LIGHT parkfler version I think it should be balsa. I'm building a 40" span, 6 1/4" chord pseudo-scale Piper Pawnee cropduster in Parkflyers. It has a 40" span,.. it's ALL SOLID sheet, and the weight will be around 10 oz with gear..(geared IPS & li-poly) it's ALL in choosing the wood. It's proof-of-concept predacessor only had a 36" span, but weighed that much (10oz)AFTER lots of lightening holes, because of poor choices in wood (old fossle-fuel habits are hard to break)
If You want to read about my experimentations with them there are links & tips all through these threads...
http://www.rcgroups.com/forums/showt...16#post2266816
http://www.rcgroups.com/forums/showthread.php?t=246240
I'm just an old-timer.... to me, foam, is sooOOOo.."PLASTIC"
Oh,.. and You can make a BRICK fly,.. if you have enough engine.(or motor).. If you want a PARKFLYER... "THINK LIGHT!" Bob
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Old Mar 13, 2005, 09:44 AM
Motors beat engines!
Milwaukee Wisconsin, United States
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Yup, flies fine at 50 oz, a bullet really. The only hard part is launch, and that became a non-problem with bungie launch.
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Old Mar 14, 2005, 06:08 PM
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Vicksburg, MI
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I guess I'll go foam. I'll be getting some plans from a friend for a 60" scale P-51 pretty soon.




-Daniel
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Old Mar 14, 2005, 07:38 PM
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>sigh<...............

>Puts on black arm band< another one lost to foam......... oh well,.. I guess as long as it gets in the air!
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Old Mar 14, 2005, 07:41 PM
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Kamloops, BC, Canada
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Wait! It's not too late! Go balsa! BALLLLLLLLLLSAAAAAAAAAA!!!!!

Martin
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Old Mar 14, 2005, 08:13 PM
Time wounds all heels.
Phoenix, AZ
Joined Jul 2001
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I have to say balsa as well. I have done some fun stuff in foam, its easy to work with and repair. But balsa is better. I build small stuff, all this talk of 20oz scares me, thats 10-20 planes in my mind, lol.

Here are a couple shots of foam and balsa, I like the 12g balsa Raven more than the 13g foam P-51, and I am a die-hard 51 fan.
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Old Mar 15, 2005, 02:53 AM
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Yeah!!!.........

What Martain & Water said!!
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Old Mar 15, 2005, 06:53 AM
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Vicksburg, MI
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The plans don't have formers drawn on them, so I'll have to buy plans. Where could I get plans for a GOOD scale P-51 that is at least 37"? I was thinking Ziroli plans but that's would be $52 and I'd have to scale stuff down, but that's ok. Any other places that might have something of good quality but maybe half the price?
I will think about doing balsa.



-Daniel
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Old Mar 15, 2005, 09:08 AM
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Kamloops, BC, Canada
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Daniel, check out www.clevelandairline.com . They've got plans in just the size you're looking for.

Martin
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