Coat the inside of the plane with thinned epoxy?
#1
Senior Member
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Coat the inside of the plane with thinned epoxy?
I'm working on a Pulse 125 XT ARF which will be powered by a DLE 20. It's been suggested to me by an experienced builder at our club that every accessible wood surface inside the plane should be coated with thinned epoxy to strengthen the structure against the extra vibration that a gas engine will introduce. So, I have either one or four questions:
1. Do you agree?
If yes,
2. What type of epoxy would you use?
3. What would you use to dilute the epoxy?
4. What ratio of epoxy to diluting agent would you use?
Cheers!
John.
1. Do you agree?
If yes,
2. What type of epoxy would you use?
3. What would you use to dilute the epoxy?
4. What ratio of epoxy to diluting agent would you use?
Cheers!
John.
#2
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Join Date: Oct 2005
Location: PerthWA, AUSTRALIA
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RE: Coat the inside of the plane with thinned epoxy?
ORIGINAL: grosbeak
I'm working on a Pulse 125 XT ARF which will be powered by a DLE 20. It's been suggested to me by an experienced builder at our club that every accessible wood surface inside the plane should be coated with thinned epoxy to strengthen the structure against the extra vibration that a gas engine will introduce. So, I have either one or four questions:
1. Do you agree?
I'm working on a Pulse 125 XT ARF which will be powered by a DLE 20. It's been suggested to me by an experienced builder at our club that every accessible wood surface inside the plane should be coated with thinned epoxy to strengthen the structure against the extra vibration that a gas engine will introduce. So, I have either one or four questions:
1. Do you agree?
2. What type of epoxy would you use?
If you are just using it for fuel proofing, go to a good paint supplier and get some urethane sealer. It is much easier to use.
3. What would you use to dilute the epoxy?
4. What ratio of epoxy to diluting agent would you use?
I am not familiar with the Pulse airframe but on many others, I have been known to add some tristock or some woven glass cloth in higher stressed areas. Make sure the firewall is pinned securely.
#3
My Feedback: (29)
RE: Coat the inside of the plane with thinned epoxy?
John, thinned epoxy is not going to add any strength. What you may want to do is hit any of the glue joints you can get to with thin CA. You will want to seal the area around the carb to keep it from getting gas soaked but that engine runs fairly dry.
#4
Senior Member
RE: Coat the inside of the plane with thinned epoxy?
I have found that the best way to do the inside of any model, gas or glow, is a good epoxy paint. If you use a light color, it also helps for visibility issues when installing equipment later. When HobbyPoxy was available, that is what I used but it is no longer regularly available if at all. Klass Kote is a very good alternate brand but rather costly (but worth it). There are probably other brands to but I have not tried them.
#5
My Feedback: (2)
RE: Coat the inside of the plane with thinned epoxy?
1. Nope
2. Standard hobby epoxy. I use 30 minute in my building. I have no use for 5 min or so, that gets used for fuel proofing only. When thats out, then I use my 30 minute.
3. Denatured alcohol from the hardware store.
4. Enough to make it a little runny. I dont do this for strength, just fuel proofing. I fuel proof the tank compartment, then drill a drain hole incase the tank splits or stopper leaks.
Edwin
2. Standard hobby epoxy. I use 30 minute in my building. I have no use for 5 min or so, that gets used for fuel proofing only. When thats out, then I use my 30 minute.
3. Denatured alcohol from the hardware store.
4. Enough to make it a little runny. I dont do this for strength, just fuel proofing. I fuel proof the tank compartment, then drill a drain hole incase the tank splits or stopper leaks.
Edwin
#7
Senior Member
RE: Coat the inside of the plane with thinned epoxy?
While somewhat beside the point, I do believe that epoxy inside the plane (especially on ARF's) can be beneficial as it will seep into any poor joint and reinforce them, especially if you use a slow epoxy and then immediately warm the area very well with a heat gun. The heated epoxy will become quite thin and capillary into any small gaps or crevices and definitely strengthen the area. The heat will also accelerate the cure time. The heat also works well with epoxy paint if you want to speed up the cure time. I also recommend the weep hole at the lowest point in the fuel compartment to drain any accidental fuel spills. Just make sure there is a clear path to it (not blocked by sponge rubber padding or such).
#8
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RE: Coat the inside of the plane with thinned epoxy?
Recommend sealing the firewall and tank compartment top to bottom with finishing resin. And if vulnerable I also coat along the wing saddle.
http://www3.towerhobbies.com/cgi-bin...?&I=LXK304&P=7
http://www3.towerhobbies.com/cgi-bin...?&I=LXK304&P=7