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Beam mounts
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Beam mounts
Do you have to glue in the hardwood beam mounts with epoxy? Is Titebond II strong enough? I have that...no epoxy. Plywood doublers go over it all anyway.....Thanks!
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Beam mounts
Titebond II is strong and water proof but not fuel proof. I use epoxy for this purpose. Epoxy is nitro fuel proof, especially 24 hours drying type.
Levent Suberk- Diamond Member
- Posts : 2152
Join date : 2017-12-24
Location : Türkiye
Re: Beam mounts
Okey dokey! ...Should the plywood doublers be glued with epoxy too then?
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Beam mounts
I have personally used wood glue to glue up the beams into the balsa as well as gluing the plywood doublers in as well. No failures as of yet. I would not worry about fuelproof at this stage as you will be painting, and or finishing the plane anyways. But myself, I would either dope the engine and mounting areas, or brush on thinned epoxy when finishing the fuselage.
NEW222- Top Poster
- Posts : 3860
Join date : 2011-08-13
Age : 45
Location : oakbank, mb
Re: Beam mounts
I echo NEW222 and use a hot hair dryer to flatten epoxy brush marks. 24 hour epoxy is best for this, but you can use 30 minute epoxy too.
Levent Suberk- Diamond Member
- Posts : 2152
Join date : 2017-12-24
Location : Türkiye
Re: Beam mounts
Thanks for the tips guys! It may be short lived and never need fuelproofing! ...Last C/l flight was in 1965-66? Whereupon my Lil Satan cashed in the last of its lives. Built a Voodoo after that,but it never got flown.
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Beam mounts
Using a fuel-resistant adhesive to glue-in the hardwood engine-bearers is good idea, in my opinion. I would follow suit with plywood doublers. Let's picture this model lasting through an extended life of flying. If/when the finish degrades from fuel-exposure, you can be assured that the underlying construction is sound.
Re: Beam mounts
The late-generation wood glues are very good.. as long as they're not exposed to model-fuels/oils. There's a strong movement toward electric-powered flight; where there are no concerns of internal-combustion engine exhaust-wastes or fuel-soaking. Many model-flying clubs are now prohibiting model-IC engine use.. period. I'm not a proponent of that.
Re: Beam mounts
OhBee wrote:Thanks for the tips guys! It may be short lived and never need fuelproofing! ...Last C/l flight was in 1965-66? Whereupon my Lil Satan cashed in the last of its lives. Built a Voodoo after that,but it never got flown.
Oh Bee, I was born in 60. I can remember when my dad was an active C/L builder/flyer in the mid-60's.

I have a CG Voodoo wing framed-up by my uncle.. many years ago.


A CEF member kindly sourced me with the templates needed to build the tail-booms/feathers and most all other parts. My wing is a spar, ribs, L/E and T/E. No tips.. no bellcrank platform.. no fuse parts.. but I can now fabricate them. I just haven't yet...

Do you still have your Voodoo?
Re: Beam mounts
"Strange times indeed."roddie wrote:The late-generation wood glues are very good.. as long as they're not exposed to model-fuels/oils. There's a strong movement toward electric-powered flight; where there are no concerns of internal-combustion engine exhaust-wastes or fuel-soaking. Many model-flying clubs are now prohibiting model-IC engine use.. period. I'm not a proponent of that.
Bob
dckrsn- Diamond Member
Posts : 2750
Join date : 2010-10-21
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Location : Long Island, New York
Re: Beam mounts
Roddie...Do you really want to hear the story of my Voodoo? It pains me. I hauled that,a lil jumping bean and a cox P-40 Flying tiger around for decades . Several moves , 2 marraiges later these planes finally all got abandoned in the attic of an old outbuilding during an abrupt move AGAIN in 1987! Like I said Nothing had been flown since the 60's so I got tired of moving stuff I didn't use. Well after I retired ,I got reinterested....too late now eh? Meanwhile I had lived in Montana for 10 years. How I wish I had them all now. As it turns out I am now living very close to where I left them. The old outbuilding is still there...but is it possible they have spent the last 32 yrs. undiscovered? I don't know who is living there now,but havn't figured out how to approach them to find out without feeling stupid! How do you even initiate the conversation? They'd probably call the cops! Would like some closure though,one way or the other! 

OhBee- Platinum Member
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Re: Beam mounts
OhBee I am a naturally shy person but surely could not resist going there and telling them I lived there and left stuff in the outbuilding that is important for me and not important for them. Show them photos of the property shot while you lived there, if you have some..identify the location in the attick where you remember having stashed the planes so that they understand you do not want to rummage the whole place to find what you are to search for..offer them a symbolic amount for the finds if any..I think they will understand you and appreciate your search for relics.
balogh- Top Poster
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Re: Beam mounts
If I find anything in the attic that belongs to former residents, I throw it to trash

Levent Suberk- Diamond Member
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Re: Beam mounts
OhBee wrote: I don't know who is living there now,but havn't figured out how to approach them to find out without feeling stupid! How do you even initiate the conversation? They'd probably call the cops! Would like some closure though,one way or the other!
Agree with Andras, plus "Confession is good for the soul"----
"Sorry to bother you folks, but I'm a model airplane nerd, and lived here long ago. I may have left behind some of my planes when we moved, and was wondering if you'd ever noticed them. They have great sentimental value, and I'd love to recover them."
That'd be my shot...plus maybe go there on a Friday---people are usually happier on Fridays...
This kind of stuff gets to me...hope you can get then back!
Good Luck, Kim
Last edited by Kim on Sun Mar 08, 2020 7:15 am; edited 1 time in total
Kim- Top Poster
Posts : 8444
Join date : 2011-09-06
Location : South East Missouri
Re: Beam mounts
Go check it out OhBee!! You never Know till you do , and like me it will haunt you till you do/ I had forgot about some stuff i left in an attic at a rently form my first Marry go round , never have gone back > i had a box full of comic books from my childhood days , my Dad would let me get one everytime we got hair cuts ! Yes the Titebond 2 will bee fine like said you will need to fuel proof ! If you don't it WILL get soaked in quickly and make the wood very weak / mushy . Now that that's said , I would love to go to Montania to see the wide open wilderness But i know i couldn't take the cold!

getback- Top Poster
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fredvon4- Top Poster
Posts : 3997
Join date : 2011-08-26
Age : 68
Location : Lampasas Texas
Re: Beam mounts
I agree with everyone here who thinks that you should stop by there to inquire. Imagine how you'd feel if the models were still there..
I know how I'd feel..
I know how I'd feel..

Re: Beam mounts
Yep. I will also echo teh others opinions on this. Don't stop, you'll never know, and will probably regret it down the road. Me, I would have already been knocking!
NEW222- Top Poster
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Re: Beam mounts
Trying to get up the nerve...I'm not a real outgoing person, and don't have a way with words.
OhBee- Platinum Member
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Re: Beam mounts
You know the address. Send a letter. Shy or not. “To whom it may concern” do a google search if you want the actual name.
To be brutally honest, if they are still there since 1987 they are probably sawdust. Bugs and heat/cold are wicked.
I would give it a shot, but don’t expect much. If it were me I would march up to the front door and just ask.
To be brutally honest, if they are still there since 1987 they are probably sawdust. Bugs and heat/cold are wicked.
I would give it a shot, but don’t expect much. If it were me I would march up to the front door and just ask.
Cribbs74- Moderator
Posts : 11888
Join date : 2011-10-24
Age : 49
Location : Tuttle, OK
Re: Beam mounts
Lets see how complicated we can make THIS!.....what would be the proper hardware to use mounting an engine to a beam mount?.....not that I'll find anything in this worthless town! Can't even find any slow cure 2 part epoxy to glue the beams in! So I have gotten no further than step one on my kit...hingeing the elevator.
OhBee- Platinum Member
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Location : Minnesota
Re: Beam mounts
Ideally, I like to personally use a machine screw on the engine side and a blind nut on the other side of the plywood doublers. However, if the blind nuts are unavailable, I use machine screw on engine side and washer / lock washer / nut on the other side. Sorry if I missed the engine size, but most I believe are 4-40 or 6-32 thread pitch. I have also used 8-32 pitch screws on an engine where the previous owner drilled out larger for them.
NEW222- Top Poster
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Re: Beam mounts
What kind of a size is a 4 or 6 sized screw? I thought they were sized in fractions of an inch ? I'm mounting TD'S , .15 OS engines ,and .35 Enyas. All with undisturbed engine bearers. No such thing as a decent hardware store around here anymore either.
OhBee- Platinum Member
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Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Beam mounts
And each of those engines you indicated will require its own size hardware...Cox .049s take 2-56 machine screws through the engine tabs and into blind nuts on the bearers or plywood. And that is because the appropriate 3-48 hardware is too tough to get.
In a pinch, #2 wood screws into plywood or bearers...again for Cox .049.
The beauty of 2-56 is the smaller diameter which gives a looser fit, and a bit more relaxed install. The extra room around the hardware allows for a bit of fudge factor.
The same 2-56 screw/blindnut hardware also held Norvels from .061-.074.
In a pinch, #2 wood screws into plywood or bearers...again for Cox .049.
The beauty of 2-56 is the smaller diameter which gives a looser fit, and a bit more relaxed install. The extra room around the hardware allows for a bit of fudge factor.
The same 2-56 screw/blindnut hardware also held Norvels from .061-.074.
944_Jim- Diamond Member
Posts : 1869
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Age : 58
Location : NE MS
Re: Beam mounts
They mean respectively:
4-40 - size 4 screw with 40 threads per inch (TPI)
6-32 - size 6 screw with 32 threads per inch (TPI)
8-32 - size 8 screw with 32 threads per inch (TPI)
A #10 screw is 3/16". Hope this helps or makes any sense.
4-40 - size 4 screw with 40 threads per inch (TPI)
6-32 - size 6 screw with 32 threads per inch (TPI)
8-32 - size 8 screw with 32 threads per inch (TPI)
A #10 screw is 3/16". Hope this helps or makes any sense.
NEW222- Top Poster
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Location : oakbank, mb
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» Narrowing engine bearers
» beam mount question
» TD/Medallion beam mount
» Brodak 1/2a zero flight video - beam mount converted
» 1/8" balsa I-beam wing spars
» beam mount question
» TD/Medallion beam mount
» Brodak 1/2a zero flight video - beam mount converted
» 1/8" balsa I-beam wing spars
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