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- This topic has 21 replies, 10 voices, and was last updated 12 years, 3 months ago by Anonymous.
09/11/2009 at 8:17 pm #41204AnonymousInactive
this might have been answered before. But, I wonder what are the tricks in rolling a balsa tube. I am making the Flying Models P-30 “Bluefin. It has 2 layers of 1/16 balsa around a 11/16” inner core. The most difficult part is the tail section. The top of the tail section is flat. But, the bottom angles upwards. Thanks!09/11/2009 at 9:18 pm #47834gosParticipant
FWIW my P30 rolled fuselage was made from straight grained 1/32nd sheet.
It’s the same dia. from front to rear.
I never felt it warranted to taper it in any way.
The wood was soaked in water overnight and rolled around a broomstick, then doped inside and out, then covered with lightweight tissue.
No blast tube has ever been used and it’s held up well if a motor lets go.09/12/2009 at 2:25 am #47835AnonymousInactive
Thanks, Have had the plans for 10 years and I have never built it before because of the rolled tube.09/12/2009 at 4:39 am #47836AnonymousInactive
A tapered tail boom is used to keep the tail end of the model as light as possible. Not using one results in a much heavier tail. Remember, the heavier the tail, the more nose weight will be needed to balance the model. Or the wing ends up in the middle of the fuselage, which is not the optimum place on any model.09/13/2009 at 3:24 am #47837AnonymousInactive
Thanks, all! The tapered tail is where the difficulty is. How to roll a tube where the bottom and sides are tapered, but, the top of the tail is flat as the main portion of the fuselage?09/13/2009 at 3:49 am #47838DAN BERRYParticipant
Roll a tapered tube, then trim the front end until the top is parallel to the fuselage top.09/13/2009 at 11:58 am #47839Dean McGinnesParticipant
And the next obvious question: How to join the tapered rear boom to the constant diameter portion? 😕 😕09/13/2009 at 4:18 pm #47840George ReinhartParticipant
Glue 😆09/13/2009 at 4:46 pm #47841DAN BERRYParticipant
Well, that’s what we use out here.09/13/2009 at 5:06 pm #47842REYNOLD MAZZOCCOParticipant
And the next obvious question: How to join the tapered rear boom to the constant diameter portion? 😕 😕
I think the Q is how do you transition from a round motor tube to an oval shaped tail boom which has resulted from cutting it off at an angle to create the flat top surface?09/13/2009 at 5:56 pm #47843AnonymousInactive
Thanks for all the replies. Should have bought the article along with the plans 10 years ago. Has anyone evr built the Flying Models magazine plan, Bluefin P-30?”09/15/2009 at 4:52 pm #47844REYNOLD MAZZOCCOParticipant
Haven’t built the Bluefin, but there are some alternatives to the tapered rear portion of the fuselage.
There is a trend to 4 strand motors that run the full length of the fuselage, so if you go that route, no need to taper the rear. Just put the peg back there.
If you are staying with a shorter motor, you could use a small diameter carbon tube attached to the top of the motor tube. Attach your stab and fin on it. End the motor tube at the rear peg. Sorta looks like a stinger.
Rey09/15/2009 at 4:57 pm #47845George ReinhartParticipant
You could get a very nice fiberglass “pirate” fuselage from Larry Bagalini at Starlink flite-tech. It will likely be smaller, lighter, and stronger than a rolled balsa tube. Well worth the relatively small money it costs In my most humble opinion.
Cheers!10/31/2010 at 1:15 am #47846AnonymousInactive
I built this model just after it was published and love it. The rear tube is molded over a tapered candle. The front of the tapered tube is cut at the proper diameter point and beveled to produce a flat top. You can temporarily insert a circle of balsa to support the end to be sanded. The joint was accomplished by again inserting a circle of balsa half into the fore piece, leaving a supported surface to GLUE the rear section. Align carefully before gluing (do I need to say this to a F/F crowd?). 💡10/31/2010 at 2:23 am #47847AnonymousInactive
Thanks for all the help. Have ordered plans from Flying Models last December. And, still haven’t heard from them.
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