RE: TWIN FEVER !!!  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> RE: TWIN FEVER !!!
Page: <<   < prev  1 2 3 4 5 6 [7] 8 9 10   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: TWIN FEVER !!! - 4/29/2008 3:36:10 AM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		Uhhh, there will be an engine in each engine mount.

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to General Lee Stupid)
       Post #: 151

RE: TWIN FEVER !!! - 4/29/2008 12:51:54 PM   
Yuu


 

Posts: 329
Joined: 9/4/2006
From: Shawano, WI, USA
Status: offline 		KidEpoxy...while I was visiting Destin, Fla, I found stainless wire fishing leader material at Wally-World. They had three sizes, marked in 'pounds test' ... so take your micrometer along and get the thin one and measure it. I think the 30# is more than .020". Other fishing stores may also have it, like Bass prop shop, etc. Some guys use it for Musky leaders too. And what's the diameter of that stainless safety wire they use on real planes?

(in reply to combatpigg)
       Post #: 152

RE: TWIN FEVER !!! - 4/29/2008 1:21:39 PM   
RocketRob



Posts: 674
Joined: 12/27/2002
From: San Francisco, CA, USA
Status: offline 		spyderwire?

(in reply to Yuu)
       Post #: 153

RE: TWIN FEVER !!! - 4/29/2008 1:52:40 PM   
ptulmer



Posts: 4770
Joined: 4/28/2003
From: Brunswick, GA, USA
Status: offline 		At the coastline it is pretty easy to find SS leader wire marked with the diameter. Might be a saltwater item. Basspro link

_____________________________

HomeMachinist.net!
Ulmer-RC.com

(in reply to RocketRob)
       Post #: 154

RE: TWIN FEVER !!! - 4/29/2008 8:13:35 PM   
KidEpoxy



Posts: 3420
Joined: 10/14/2004
From: San Antonio, TX, USA
Status: online 		Thanks for the heads up un where I can get the wire.
But an un-named benefactor came forth & volunteered to grant me a few feet of the magic metal.
Now I gotta figure out how to mail him a ThankYou 6pack.

Oh, for a change of pace,
I built two left wings.
Which is odd, because I normally build two right wings .
Fortunately, they are truely symetric, so I just need to cut the build alignment tabs off the ribs & flip it over to make a left into a right. The wee bit of dihedral balanced out to make a flat after I flipped it over, and I can live with that no problem.

I figure if I can make a couple bones wing panels in a day, CP is probably on his 3rd coat of dope on his finished plane by now

_____________________________

Optional MA is part of AMA history, we can go optional AGAIN if we just say so

(in reply to ptulmer)
       Post #: 155

RE: TWIN FEVER !!! - 4/30/2008 1:14:18 AM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		KE, I just saw where you had questions about hot wiring .
Some thoughts:
Perfectly smooth and defect free templates
You need absolute accuracy in set up, garbage in really does equal garbage out with hot wiring
Maintain good tension, don't hurry the cut, don't use too much heat.
Don't be discouraged easily, just try to learn from mistakes and take corrective action.
Home Depot white foam is full of hard spots the will cause defects. Just try to blast through them if the wire gets stalled, then sand off high spots later.
Try to find a supplier of virgin foam.
Use a fan when you cut white foam, use a respirator if cutting those urethane foams
If your cuts leave fine wispy hairs on the surface, the heat was perfect, knock them off with a sanding sponge
Vacuum your foam after sanding
Use scraps of plywood to keep your foam stationary and to keep it still while doing your cuts.
A fine line marking pen is a must
Use a paper towel to wipe the wire after making a cut
Don't ever let the wire get red hot, adjust the heat till you hear or feel the 60 cycle humm, then test on scrap foam

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to KidEpoxy)
       Post #: 156

RE: TWIN FEVER !!! - 5/1/2008 5:16:35 AM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		Here's what the Russian bomber looks like. This wing is just about done, there will be a HS 65 to directly drive each aileron. There was a little mishap handling the wing during construction, so you could say the model has already crashed and been repaired.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to combatpigg)
       Post #: 157

RE: TWIN FEVER !!! - 5/1/2008 9:17:20 AM   
digital_trucker



Posts: 1279
Joined: 2/4/2006
From: Dorr, MI, USA
Status: offline 		I'm lucky to have a supplier of virgin foam right up the street, a company that actually makes the stuff from the raw beads...door cores and the like. Oddly, I've never used it...balsa just flies better.

_____________________________

I feel I can speak for 90% of humanity when I say 'durrrr'
Skype digital_trucker

(in reply to combatpigg)
       Post #: 158

RE: TWIN FEVER !!! - 5/1/2008 2:55:46 PM   
KidEpoxy



Posts: 3420
Joined: 10/14/2004
From: San Antonio, TX, USA
Status: online 		Nice wing CP.
What is the final span & cords, and did you settle on a nice Nike-Y(shoe trace) foil or something more official?

I joined my 2 panels while still ribby to lay full span sheet, but got scared at just how small a 3" Tip makes a wing. 8" root to 3 tip dont leave much area, so I shelfed that set & started cutting a 5' with 11root 4tip.

If you are making your bird with not a lot of wing, maybe I could get away with it too. You said about 4' span earlier, and your IL4 has small tips too, so maybe I dont have to shelf the first wing.

Of course, in classic CP fashion, you are thinking twin Norvels where I am thinking of 7x3 on SureStarts for bomber-like flight rather than CP Bullet-like flight

_____________________________

Optional MA is part of AMA history, we can go optional AGAIN if we just say so

(in reply to digital_trucker)
       Post #: 159

RE: TWIN FEVER !!! - 5/2/2008 12:40:55 AM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		KE, I would never waste my time with a real airfoil for a 40 mph 1/2A plane! Arguably, the best all around flying models for extreme speed and agility are AMA fast combat planes. Get a load of those airfoils....go to the river and look for a smooth rock that looks like it would be good for skipping across the river and there you go .
This wing is 11"x4.75"x 52".....I would not fret over 3 inch tips if you build the plane light enough. I looked at the plane you suggested and sneered at those pointed tips, but there is enough useful wing area there for a pair of .049s.
Even with a pair of .074s, the performance gain is with climbing ability, the speed is roughly 40 mph all day with 3 pitch props.
Press on with your project. You'll learn a lot from it and even if it isn't 100% of what your expectations are, there is no substitute for hands on experience.
Your idea for a 5 foot span plane sounds good if you stick build it and keep it light. I just decided on 4 feet for this one because I wanted to try something a little bit hot.

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to KidEpoxy)
       Post #: 160

RE: TWIN FEVER !!! - 5/5/2008 6:28:49 AM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		Today was a good progress day, [didn't do anything real stupid] just forward progress.
The bulkheads are made from 1/16" balsa sheet glued cross grain with 3M77 The center keel is a piece of 3/16" "iron wood" balsa that I've been saving for a job like this. The stringers are 3/16 square balsa. The fuselage is glued to the wing to save some weight. What you see so far weighs 8.6 ozs.

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by combatpigg -- 5/5/2008 6:48:03 AM >

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to combatpigg)
       Post #: 161

RE: TWIN FEVER !!! - 5/5/2008 4:34:40 PM   
KidEpoxy



Posts: 3420
Joined: 10/14/2004
From: San Antonio, TX, USA
Status: online 		CP,
You could probably mail the styro core slices to some electric guy as a "Foamie Kit".
I'm sure a lot of them would be aghast that you have already made a foam wing & fuse, just to be cut up... watch out for them rummaging thru your trash for a plane they just need to stack, glue, & put guts in

Looks good.
I was going to build a coffe table out of some of that IronWood Balsa I have, but I like your plan better. Actually, mine is 1/16 and gets used up as bulletproof wing centersheeting... anit no saddle gonna dig into that

Speaking of saddles:
I see you sharp-tapered down the front of your saddle stock past the leading former,
but let the tail end run to the next former. uh, why?

_____________________________

Optional MA is part of AMA history, we can go optional AGAIN if we just say so

(in reply to combatpigg)
       Post #: 162

RE: TWIN FEVER !!! - 5/5/2008 5:10:51 PM   
rainedave



Posts: 5193
Joined: 7/21/2005
From: Greensboro, NC, USA
Status: online 		Very cool subject, cp. It looks to have the right proportions and moments.

Here's an old Ziroli design that I've been mulling over for about two years. I think it could be easily scaled down, simplified and lightened up.

David

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize

(in reply to KidEpoxy)
       Post #: 163

RE: TWIN FEVER !!! - 5/5/2008 8:38:27 PM   
Andrew


 

Posts: 1949
Joined: 2/4/2003
From: Murray, KY,
Status: offline 		CP

This is a first for me. I've seen lots of templates cut in order to shape foam wings and fuselages, but I've never seen foam wings and fuselages cut in order to shape templates. That's a pretty slick idea, especially if you don't have software to loft all the ribs and formers.

_____________________________

the "other" andrew
I'm not older than dirt, but I can remember when it was patent pending

(in reply to rainedave)
       Post #: 164

RE: TWIN FEVER !!! - 5/5/2008 11:18:26 PM   
combatpigg



Posts: 9830
Joined: 11/22/2003
From: arlington, WA, USA
Status: offline 		KE, I figured that the former would be a good spot to land the aft end of that plank. I think I'll save those foam chunks because there are plenty of other projects they could be made to work for.

Andrew, this system isn't without its faults. You can't allow those fine line reference marks to entirely go away as the shaping process progresses, there is constant touch up work. Also the margin for error when taking tracings off of compressable foam is enough to leave you with parts that are less than perfect.....but still workable.

RD, the Ziroli model is about the same size as this one, if you redesigned it and used about 1/2 the wood it would be fine. All that 1/16" planking doesn't look like much at first glance, but all that planking represents lots of glue to attach every inch of every seam. The squarish contours of the B25 would let you get by with very few stringers in some spots.

Nobody said anything about the "fuselage jig" made out of 2 two-by-fours laying side by side and those one-by-twos laid cross ways under the keel. It allows you to flip the keel over and build the opposite fuselage side while keeping the keel straight.

< Message edited by combatpigg -- 5/5/2008 11:35:37 PM >

_____________________________

Led Zeppelin is NOT "old fogie" music.

(in reply to KidEpoxy)
       Post #: 165

RE: TWIN FEVER !!! - 5/6/2008 12:33:17 AM   
<