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Post by Admin on Nov 16, 2019 15:08:00 GMT -5
I'm almost finished my Tower Hobby Sbach Arf. I'm powering the plane with a Rimfire .32, (recommended) and using Hitec HS-82MG 19g Servos (compatible / comparable to the recommended Futuba S3172SV mini-servos) and powered by a 4S 3600. Reading some of the stories about those who have flown or reviewed the plane, they're really isn't a consensus as to whether or not the firewall needs reinforcement. The pictures below are what the firewall looks like now. I can't discern any obvious missed areas of glue, or apparent weakness. However, some of the reviews have said the firewall needs to be brushed with an epoxy solution to add strength. This isn't a Great Planes kit, its a budget kit that I thought would give me some experience as an ARF build. Nevertheless, its a pretty airplane, and I would like it to be a longer term, rather than shorter term flyer. Should I being trying to strengthen the firewall? I know that can add weight to the plane. Or should it be good to go like this?
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RICK
New Member
Posts: 40
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Post by RICK on Nov 17, 2019 19:23:28 GMT -5
the fire wall looks ok if you wanted some 1/4 triangle balsa along the inside corners and joints will add strength also ca glue all the wood joints ,using some finishing resin or thin epoxy will help harden the wood and will seep into the joints .As far as weight goes your not adding really any weight BUT DON'T GET CARRIED AWAY WITH THE GLUE OR THE EPOXY RESIN you will add weight if you go over board .your engines are electric and if your props are balanced right you wont see any vibration like fuel engines
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Post by Admin on Nov 21, 2019 10:01:20 GMT -5
Rick. Thanks for the 1.4 triangle blasa tip. I'm going to do that and a little bit of the thin epoxy painting on the joints around the firewall.
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RICK
New Member
Posts: 40
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Post by RICK on Nov 21, 2019 20:40:47 GMT -5
great use epoxy to glue the triangle stock ,be careful when thinning the epoxy with alcohol ,sometimes the epoxy wont setup try some on scrap wood to see if it sets up and hardens or you will have a mess to fix ,finishing resin can be thinned with alcohol about 3 to one with no problems let me know how you make out
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RICK
New Member
Posts: 40
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Post by RICK on Nov 22, 2019 18:25:03 GMT -5
I was thinking about thinning the epoxy i have mixed small amounts say 1/2 oz and warm it after mixing, as long as you don't over heat it ,it will set fine and thin out so you can brush it on, i mix small amounts so you don't get a runaway thermal chemical reaction .this can happen when you mix large batches of resin because of heat build up plus your heating it with a heat gun .Sorry i forgot to tell you this the last day but remembered it now .i have done this many times to glue fiberglass tape down when joining wing halves together
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