C/L Gee Bee · Nov 21, 2003 04:56 PM
#0 source
I haven't been enlightened to the Lost Foam Method. Can someone explain the 'semantics' so I can get it on my mindscreen?
Lost Foam Method
Stuka Stunt Main Forum · 15 of 15 known posts recovered
>I haven't been enlightened to the Lost Foam Method. Can
>someone explain the 'semantics' so I can get it on my
>mindscreen?
>someone explain the 'semantics' so I can get it on my
>mindscreen?
I am reminded of the discussion concerning information put out on Stuka Stunt and in PAMPA's Stunt News.
The most recent issue of the latter contained the second part of an exceedingly comprehensive overview of the subject at hand.
PAMPA, Stunt News--and our own Larry Foster--win this round quite easily indeed.
**JOIN PAMPA,** for God's sake...
Dan
Did I just miss it? When was the first part of this series published?
Curt
Bill Little · Nov 21, 2003 06:37 PM
#2 source
Hi Mike,
Since I reviewed one of the very first Lost Foam units that Bob Hunt made while I was writing the Product Review column in Stunt News, I will give you a short version.
Bob basically cuts a foam wing in the standard manner, with extra care taken to assure symmetry from one cradle to the other.
Then the rib, spar, etc., positions are marked on the cores. This allows for standard or geo style rib arrangments. When the cuts are made on the rib lines, a "perfect" template to cut the rib is created. All spar locations, etc., are marked on the cradles which serve as an extremly accurate fixture which you build the wing in. Once the cores are cut up at the rib stations, the cores are "lost" as to being used in the conventional foam wing manner.
HTH
Bill <><
Since I reviewed one of the very first Lost Foam units that Bob Hunt made while I was writing the Product Review column in Stunt News, I will give you a short version.
Bob basically cuts a foam wing in the standard manner, with extra care taken to assure symmetry from one cradle to the other.
Then the rib, spar, etc., positions are marked on the cores. This allows for standard or geo style rib arrangments. When the cuts are made on the rib lines, a "perfect" template to cut the rib is created. All spar locations, etc., are marked on the cradles which serve as an extremly accurate fixture which you build the wing in. Once the cores are cut up at the rib stations, the cores are "lost" as to being used in the conventional foam wing manner.
HTH
Bill <><
Dont worry about the mule going blind 'til you get the cart loaded!
Larry Cunningham · Nov 21, 2003 08:03 PM
#5 source
I believe Bob Hunt said he coined the term "lost foam" from a "lost wax" casting method he was reminded of.
[photo not recovered: 3e69bb3870f12ad5.jpg]
"The meek may inherit the earth - but not its mineral rights." -J. Paul Getty
Bill Little · Nov 21, 2003 08:15 PM
#8 source
Hi Larry,
Next time you see Bob, ask him about "Lost Frog" casting!! LOL!!
Bill <><
Dont worry about the mule going blind 'til you get the cart loaded!
tperry2054 · Nov 21, 2003 07:51 PM
#3 source
Mike,
It is analogous to the lost wax method of metal casting. Shape your foam by any method you choose and sand it till slightly under sized for what ever you are trying to create. I have used the lost foam method to make cowls, wheel pants, fuselage sections and other non-model airplane stuff for SWMBO. Generally I cover the foam with fiberglass, and then after it has dried I swish the part around in solvent and the foam melts and only the fiberglass remains. I find it easier to do any drilling or cutting before dissolving the foam. If the part is too large you just pour the solvent in shake it a little and pour it back out. Back when I was still young enough to fly combat I used it to make pacifier tanks from fiberglass. I experimented with skinning a fuselage with the balsa formers let in to the foam and covering with balsa but never finished it yet!
I have just returned to this hobby after a 30-year absence.
It is analogous to the lost wax method of metal casting. Shape your foam by any method you choose and sand it till slightly under sized for what ever you are trying to create. I have used the lost foam method to make cowls, wheel pants, fuselage sections and other non-model airplane stuff for SWMBO. Generally I cover the foam with fiberglass, and then after it has dried I swish the part around in solvent and the foam melts and only the fiberglass remains. I find it easier to do any drilling or cutting before dissolving the foam. If the part is too large you just pour the solvent in shake it a little and pour it back out. Back when I was still young enough to fly combat I used it to make pacifier tanks from fiberglass. I experimented with skinning a fuselage with the balsa formers let in to the foam and covering with balsa but never finished it yet!
I have just returned to this hobby after a 30-year absence.
Tom Perry
>Mike,
> It is analogous to the lost wax method of metal casting.
>Shape your foam by any method you choose and sand it till
>slightly under sized for what ever you are trying to create.
> I have used the lost foam method to make cowls, wheel
>pants,
>Tom Perry
> It is analogous to the lost wax method of metal casting.
>Shape your foam by any method you choose and sand it till
>slightly under sized for what ever you are trying to create.
> I have used the lost foam method to make cowls, wheel
>pants,
>Tom Perry
Hi Tom,
You are so correct, but I haven't even thought about "lost foam" in that context since Bob came out with his Lost Foam wing system! LOL!!
So I guess the question to Mike is: Which "lost foam" system are you wanting to know about?
Tom thanks for the reminder!
Bill <><
EDIT: I just remembered the Hobby Poxy "balloon molding" method! LOL!!
Dont worry about the mule going blind 'til you get the cart loaded!
Ty Marcucci · Nov 21, 2003 08:09 PM
#6 source
Instead of covering the foam wing with balsa, the core is cut carfully so as to make ribs, usually for a warren truss or geodetic form of structure. These ribs are laid into the cradle and the wing built in the usual spar/rib/sheeting method. Only it is much lighter, straighter. The original foam core is now in pieces and is thus "lost". To really understand and see this in action, I highly reccomend obtaining Robin Hunts video on "Lost Foam" wings. It is worth the price and you can always resell it to some sucker, er fellow modeler later.
Bill Little · Nov 21, 2003 08:13 PM
#7 source
Hi Ty,
Ain't that what I said? LOL!!
Bill <><
Dont worry about the mule going blind 'til you get the cart loaded!
C/L Gee Bee · Nov 21, 2003 08:41 PM
#9 source
Thanks, guys. I would have seen it in Stunt News, but just joined PAMPA and all my back periodicals haven't arrived yet.
Now, when I heard of "lost foam", I reverted to when we used it for cowls & wheel pants. Couldn't for the LIFE of me imagive pouring B12 Chemtool through a freshly-sheeted wing! This is why I asked, and now am up to speed on the term. I am relieved, however, as the way I remember it was not a dream after all!
1) Lost Foam method
2) Dry Lost Foam Method
The Diaganol rib is much more within reach now, thanks for your patience. I feel like Jake Blues, "Ahhhh'll get the tapes."
Now, when I heard of "lost foam", I reverted to when we used it for cowls & wheel pants. Couldn't for the LIFE of me imagive pouring B12 Chemtool through a freshly-sheeted wing! This is why I asked, and now am up to speed on the term. I am relieved, however, as the way I remember it was not a dream after all!
1) Lost Foam method
2) Dry Lost Foam Method
The Diaganol rib is much more within reach now, thanks for your patience. I feel like Jake Blues, "Ahhhh'll get the tapes."
Ty Marcucci · Nov 21, 2003 09:18 PM
#10 source
Hey, I type real slow. Your response just got here fustus.
C/L Gee Bee · Nov 24, 2003 11:56 PM
#12 source
WHOA!!Dudes!!!My Pampa Stunt News just arrived, and the "Jim" is all in there! Join PAMPA, everybody. A whole magazine full of nothing but C/L! THE ADS ARE ALL RELEVENT!!!
I'm really happy now.
I'm really happy now.
>WHOA!!Dudes!!!My Pampa Stunt News just arrived, and the
>"Jim" is all in there! Join PAMPA, everybody. A whole
>magazine full of nothing but C/L! THE ADS ARE ALL
>RELEVENT!!!
> I'm really happy now.
>"Jim" is all in there! Join PAMPA, everybody. A whole
>magazine full of nothing but C/L! THE ADS ARE ALL
>RELEVENT!!!
> I'm really happy now.
Mike,
I hereby withdraw my previous and ill-considered comment.
Welcome to PAMPA and to Stunt News!
Dan
C/L Gee Bee · Nov 26, 2003 12:52 AM
#14 source
Just previous to receiving my "Stunt News", Larry Foster forwarded both parts, and it was as if he had drawn them. Thanks, Larry, and henceforth, let it not be said that this site and Stunt News are interlogotory. The two run hand-in-hand, and are intercomplimentary.
Dan, no hard feelings. I regard you as a 'fellow Californian', in the best strain. (!) I only regret that I was late in joining PAMPA.
Incidentally, it was this site that led to the intro!
Epicularily, Mike in Atwater
(Eat your heart out, Howard Cosell)
Dan, no hard feelings. I regard you as a 'fellow Californian', in the best strain. (!) I only regret that I was late in joining PAMPA.
Incidentally, it was this site that led to the intro!
Epicularily, Mike in Atwater
(Eat your heart out, Howard Cosell)