If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
"Lou Parker" piped up: Anyone know of any downfalls to using liquid nails to glue spars together? And yes, I expect the usual ignorant smart asses, who really don't have an answer. Lou I built a bird feeder with liquid nails. It lasted six months and then fell apart. Rich "ISA" S. ++++++++++++++++++++++++++++++++++++++++++++++++++ +++ I used only Liquid Nails and a smile..... to hold 2 x 4 foot sheet styrofoam panels of insulation to my raw concrete basement walls. None of it rests on the floor for support. No idea how long it will stay glued....... it's only been up 20 years to date without a single panel coming loose. Barnyard BOb -- well known smart, smart ass. |
#12
|
|||
|
|||
|
#13
|
|||
|
|||
"Stealth Pilot" wrote in message ... On 19 Nov 2003 10:01:51 -0800, (Lou Parker) wrote: Anyone know of any downfalls to using liquid nails to glue spars together? And yes, I expect the usual ignorant smart asses, who really don't have an answer. Lou maybe I'll be the only one to give you a serious answer. I already pointed out that it doesn't have much sheer strength. Old liquid nails joints also are real brittle. It only takes a few sharp blows to break the bond. I've demolished a lot of stuff in my house that was put together with it. |
#14
|
|||
|
|||
|
#15
|
|||
|
|||
Earlier, Stealth Pilot wrote:
Acid catalysed phenolics (like Selleys 308 in australia ) use formic acid ... ...this acid catalyst has been found to continue working as an acid after the cure and has led to wood failures beside the glue joint. people have died in structural breakups of aircraft because of it. The issue of acid-catalyzed urea-formaldehyde glues in Australia is explored somewhat in the article I cited earlier in this thread. Not being a wood enthusiast I don't really care one way or the other, but I think that folks who do care should know that there is more than a single side to this particular story. Bob K. http://www.hpaircraft.com/hp-24 |
#16
|
|||
|
|||
"Bob Kuykendall" wrote ...like 99-cent deer nuts being under a buck.... You owe me a keyboard Bob. |
#17
|
|||
|
|||
- Barnyard BOb - wrote in message . .
I used only Liquid Nails and a smile..... to hold 2 x 4 foot sheet styrofoam panels of insulation to my raw concrete basement walls. None of it rests on the floor for support. No idea how long it will stay glued....... it's only been up 20 years to date without a single panel coming loose. That doesn't really surprise me. The solvent in the liquid nails probably melted the styrofoam a bit creating a good bond. Those panels are not subjected to any significant stresses, certainly no aerodynamic stresses nor do I imagine, does your basement get as warm as an aircraft on a hot day in teh sun. Probably not much exposure to moisture or cold temperatures either. Besides, those panels didn't weigh dick in the first place. For spars *I* would only use epoxy or a urethane glue like Gorilla glue. Resourcinol glue, used in boat building might be good too. I suggest that you only rely on something that a siginifacnt number of other folks have used and survived. Learn from other people's mistakes. -- FF |
#18
|
|||
|
|||
Stealth Pilot wrote in message . ..
On 19 Nov 2003 10:01:51 -0800, (Lou Parker) wrote: Got any info on urethane glues like Gorilla glue? They're supposed to be good for outdoor wood projects. Also a note on varnishing: All film finishes for wood, paint, varnish, laquer, shellac (I think that is all) will allow water vapor diffusion so that changes in humidity will still cause the wood to expand and contract. What these finishes do for the structure is to SLOW the rate of diffusion so that any moisture gradient within the wood is minimized. This in turn minimizes warping, but not the overall dimensional change. The expansion and contraction of wood with moisture content is anisotropic. Wood expands and contracts the most along the grain boundaries. This will be accross the fact of most boards that you get by sawing the log through and through, that is in the direction that was tangent to the circumfrence of the tree. Wood expands and contracts less accross the grain, that is in the direction that was radial in the tree trunk. It hardly expands and contracts at all in length. I have read that Doug Fir is uniquely stable among woods in that it expands and contracts equally in both the radial and circumferential directions and so it is the only wood commonly sold as dimensional lumber while still green (others will usually be kiln dried to 12 % MC) However, I have seen Doug Fir boards cup and uncup with variations in humidity, indicating to me that this is not true. -- FF |
#19
|
|||
|
|||
Earlier, "Gig Giacona" wrote:
You owe me a keyboard Bob. I'm sure glad somebody got that one. Here's the full riddle: What's the difference between beer nuts and deer nuts? Beer nuts are $1.39, but deer nuts are under a buck. Thanks, and best regards to all Bob K. |
#20
|
|||
|
|||
(Fred the Red Shirt) wrote: I suggest that you only rely on something that a siginifacnt number of other folks have used and survived. Learn from other people's mistakes. +++++++++++++++++++++++++++++++++ You've got my vote, Fred. However, there is a core of wannabees hell bent on re-inventing the wheel in some ridiculous manner, at least with their keyboards most every day - all under the guise of *EXPERIMENTING*. Anyone that poo-poos their nutty notions without great care are labeled as anti-experimenters or worse and are subject to very hostile and denigrating attacks. You know the drill... KILL THE MESSENGER Barnyard BOb - over 50 years of successful flight |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Marske spar workshop | Marske Flying Wings | Home Built | 0 | October 14th 03 04:53 PM |
FS: Wing spar angle extrusions | Bob Kuykendall | Home Built | 0 | September 25th 03 08:23 PM |
Carbon Spar design and construction workshop | Marske Flying Wings | Home Built | 0 | September 18th 03 05:47 PM |
Wood questions - Public Lumber Company, determining species at the lumberyard | Corrie | Home Built | 17 | September 17th 03 06:51 PM |