6 year old Demon resurfaced
12-11-2015, 09:30 PM
#53
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Back in the day that we were mounting servos with "servo tape", now known as double stick foam tape, I always made sure to coat the surface to be adhered to with epoxy or CA or something. Just get a film over that balsa before using a tape surface.
Then came Goop. What a change! I still like the idea, I think it was CP who said, if the balsa is soft, put a 1/32" ply over it. But Goop is a monstrous adhesive. If it'll hold a blown out sneaker together, and it does, it'll hold a servo in an SD.
I can guarantee what's going in the servo bays of my SD. A wedge to seat the servo at my preferred angle, then a nice bed of Goop.
Hey, it ain't often you get to use magic faerie boogers!
You know you want 'em.
Dave
Then came Goop. What a change! I still like the idea, I think it was CP who said, if the balsa is soft, put a 1/32" ply over it. But Goop is a monstrous adhesive. If it'll hold a blown out sneaker together, and it does, it'll hold a servo in an SD.
I can guarantee what's going in the servo bays of my SD. A wedge to seat the servo at my preferred angle, then a nice bed of Goop.
Hey, it ain't often you get to use magic faerie boogers!
You know you want 'em.
Dave
12-11-2015, 11:03 PM
#54
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I put the output arm forward to help clearance to the airframe en route from the rear of the radio compartment. Not sure if that is so obvious I'm a twit for saying so, but anyway it works better for me.
12-13-2015, 07:59 AM
#56
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I have tried tape for servos in foam planes but they were never anything high performance. I balsa planes I made mounts and screws some with silicon for extra hold but never Goop have got to try it.
Last edited by iron eagel; 12-13-2015 at 08:01 AM.
12-13-2015, 10:13 AM
#57
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Please do..
IMHO, silicones are not good adhesives, they are hard to apply nicely, they are tough to clean up, and silicones are great for not letting other materials bond to them. I used them until I got sick of the length of the “cons” list versus the short “pros” list. Seriously, the first time I opened a tube of Goop and made a few test articles.. I pulled all the silicone this and thats out of my goo bin and that’s the last time silicones touched my models.
To me, silicone is something you use when you don’t have a better solution on hand yet.
Goop is fuelproof, it is easier to apply neatly, you can clean it up with various solvents without contaminating the adjacent surfaces and screwing up adhesion for other things such as adhesive and covering, and it has some surface energy and other things can bond to it. You can dip a gloved finger (
) in solvent and smooth it out too.
Tech note: it is not listed on the MSDS sheets because the amount and nature is not required to be reported (see notes in section 3), but there is a bit of chlorinated solvent in it, and this will cause some grief with EPO foam. Don’t use it on EPO, although it looks alright at first.
IMHO, silicones are not good adhesives, they are hard to apply nicely, they are tough to clean up, and silicones are great for not letting other materials bond to them. I used them until I got sick of the length of the “cons” list versus the short “pros” list. Seriously, the first time I opened a tube of Goop and made a few test articles.. I pulled all the silicone this and thats out of my goo bin and that’s the last time silicones touched my models.
To me, silicone is something you use when you don’t have a better solution on hand yet.
Goop is fuelproof, it is easier to apply neatly, you can clean it up with various solvents without contaminating the adjacent surfaces and screwing up adhesion for other things such as adhesive and covering, and it has some surface energy and other things can bond to it. You can dip a gloved finger (
) in solvent and smooth it out too.Tech note: it is not listed on the MSDS sheets because the amount and nature is not required to be reported (see notes in section 3), but there is a bit of chlorinated solvent in it, and this will cause some grief with EPO foam. Don’t use it on EPO, although it looks alright at first.
12-13-2015, 08:36 PM
#58
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About all I use silicon for today is calking.
Good to know that about goop, I had used it many years ago but never though of bonding servos with it.
Have you finished painting your big block Demon yet?
Good to know that about goop, I had used it many years ago but never though of bonding servos with it.
Have you finished painting your big block Demon yet?
12-14-2015, 06:37 AM
#59
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Big block? That one is done and flown - do you mean the white one I've been putzing with recently? That one just has a West .50 in it, I've been fussing over a full cowl for it. Cowl is finished now, in the spot putty and final surface prep phase before priming. The just need to add some color/graphics to it.
12-21-2015, 07:50 PM
#61
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Made a new hatch and glued it together straight this time. Cowl all done, internally only the IMC install to go if I still insist on fitting one, plus Rx. Switch in ply hatch, finish hatch. Couple of other small items. Then fresh topcoat on upper then trim. All ready for winter.
01-17-2016, 06:37 PM
#65
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OMG... 
!!!!!!
I just weighed the Demon .65, realizing I could now weigh it in one piece on the cheapie digital kitchen scale I got not too long ago.
I'm still laughing.. 4lb 10oz dry weight.. no wonder wonder it's such a bloody handful! It needs ceramic tape on the leading edge for the glide home.
!!!!!!I just weighed the Demon .65, realizing I could now weigh it in one piece on the cheapie digital kitchen scale I got not too long ago.
I'm still laughing.. 4lb 10oz dry weight.. no wonder wonder it's such a bloody handful! It needs ceramic tape on the leading edge for the glide home.
01-19-2016, 08:42 PM
#66
I'm pretty sure my Nelson .40 powered Demon is over 4 pounds too.
It's got a pair of huge elevon servos that are overkill.
A 4 cell AA battery pack
Full size 72 Mhz RX
Lots of fiberglass and paint
The launches are proof that God watches over our hobby sometimes. I don't care what anyone says, this plane enters "Ground Effect" on most launches before it's up, up and flying on it's own.
Whatever a 6.75 x 7 prop puts out at 24,000 or so is what it launches 4 + pounds with.
It's got a pair of huge elevon servos that are overkill.
A 4 cell AA battery pack
Full size 72 Mhz RX
Lots of fiberglass and paint
The launches are proof that God watches over our hobby sometimes. I don't care what anyone says, this plane enters "Ground Effect" on most launches before it's up, up and flying on it's own.
Whatever a 6.75 x 7 prop puts out at 24,000 or so is what it launches 4 + pounds with.
01-20-2016, 12:43 PM
#68
I think a Launch Trolley based on long cable guides and a winch style arrangement to pull the Trolley up to a good launch speed is the answer.
The trolley could ride on eye bolts that slide along the guide cables.
Once you get to the end of the line, a lanyard / pin is yanked out to release the plane from the trolley.
The timing of the release is important so that the plane isn't accidentally launched into either guide cable.
This idea would use a lot of rope, cable, poles, tent pegs but there wouldn't be any latex tubing involved or fancy mechanisms that I can visualize. It would neatly store in a big plastic tupperware bin except for the poles.
The tow rope could double back via clothesline pulley to a helper to provide the power for the trolley.
The trolley could ride on eye bolts that slide along the guide cables.
Once you get to the end of the line, a lanyard / pin is yanked out to release the plane from the trolley.
The timing of the release is important so that the plane isn't accidentally launched into either guide cable.
This idea would use a lot of rope, cable, poles, tent pegs but there wouldn't be any latex tubing involved or fancy mechanisms that I can visualize. It would neatly store in a big plastic tupperware bin except for the poles.
The tow rope could double back via clothesline pulley to a helper to provide the power for the trolley.
01-20-2016, 06:15 PM
#69
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I have a 10' length of Unistrut I got ages ago to make such a device, whatever it was going to be. I envisioned a sled inside with a soft stop at the end, an internal cable, turnaround pulley, and some form of propulsion.
