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BH Twister

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Old 08-05-2012, 02:43 PM
  #1  
H5606
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Default BH Twister

This is another defunct RTA airplane that I couldn't pass up from Hobby People. I believe it was on sale at the time & at a price I couldn't resist. It is of conventional design, shoulder wing, constant chord, tail dragger, with approx 540 sq. in. of wing area for a .35 to .45 size 2-stroke and is built in Vietnam. Upon initial inspection, the bump that represents a canopy has to go. The main gear is too far forward and in my opinion, has to move back behind the leading edge rather than where the mfg located it fwd of the LE. The "pinned" piano-style hinges also bother me particularly since it looks like hot-melt glue was used to install them.
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Old 08-05-2012, 02:54 PM
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Neo gold
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Default RE: BH Twister

Ah, i remember my old twister!....had bags of fun with this & i had an OS 46AX initially..then upped it to an AX55 ...silly thing to do!, flew the wings off this for a few seasons until i got a little daft & plowed it into the ground 'from an unrecoverable flat spin'.....i had no problems with the hinged & pinned controls surfaces at all...
This will do most manouvers with the utmost ease...you can take off & land this with your eyes closed...honest!, you'll get super~over confident with it...enjoy.
Marc.
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Old 08-05-2012, 03:18 PM
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ORIGINAL: Neo gold

Ah, i remember my old twister!....had bags of fun with this & i had an OS 46AX initially..then upped it to an AX55 ...silly thing to do!, flew the wings off this for a few seasons until i got a little daft & plowed it into the ground 'from an unrecoverable flat spin'.....i had no problems with the hinged & pinned controls surfaces at all...
This will do most manouvers with the utmost ease...you can take off & land this with your eyes closed...honest!, you'll get super~over confident with it...enjoy.
Marc.
Good to know; thanks for dispelling any concern over the hinges. I hope I have as much fun with it as you had.
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Old 08-05-2012, 04:00 PM
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The cowling was way too thin and damaged with chipped paint missing so I decided to add thickness. Because epoxy doesn't seem to do well over polyester and my old K&B resin looked like Jello, I decided to buy a quart at the local auto parts store. I wet sanded the paint off the cowl, cut patterns from stiff paper, cut lft, rt, top, and bottom pieces of 6 oz glass and applied them to the inside of the cowling to triple the thickness...
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Old 08-06-2012, 11:28 AM
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Ok, so I'm dumb. What's RTA?
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Old 08-06-2012, 04:21 PM
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ORIGINAL: Texastbird

What's RTA?
Ready-To-Assemble.
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Old 11-10-2017, 04:04 PM
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Some other things I don't like include color scheme, number of hinges, hinge gap, a spinner that's not yellow, and control surfaces without enough thickness taper. I decided after all to begin removing the hinges with the assistance of heat and lots of pulling...
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Old 11-11-2017, 09:47 AM
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Good practice here harvesting the covering material and hinges for use down the road on similar or smaller-sized airplanes so that when in post-apocalyptic world will have developed these skills already. Uncovering elevators, horizontal stab, vertical stab, and rudder. The existing hinge slots are wide enough to drive a tank through. Used partially installed screws to hammer out the blind nuts on the gear plate in the fuselage and took off the canopy blister.
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Old 11-11-2017, 10:34 AM
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Cleared covering from fuselage and over-wing hatch. There's no instructions in the owner's manual about covering removal so you're on your own here. Getting better at uncovering now - reversed the mfg's covering process which was covering top and bottom first, then sides. Naked fuse feels heavy and weighs 9 and 5/8 oz. Just for fun, checked covering removed is 3/4 oz.
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Last edited by H5606; 11-11-2017 at 10:47 AM.
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Old 01-28-2018, 03:34 PM
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Used heat to facilitate removal of the main-gear mounting plate; if it is actually hot-melt glue, it only becomes gummy under the heat gun but will let go under significant leverage.
Ran bolts thru fender washers to spread out the load on the gear plate and clamped on Vice-grip pliers to give a handle to pry on - prying it out lifted the adjacent bottom sheeting.

Partially installed landing gear screws and some spacers under plate allow quick removal of the blind nuts using light tapping.

Removed forward bottom sheeting and used additional heat with chisel to remove gear doublers from fuselage sides; there is no fuel proofing in this area so will now have better access to do so.
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Old 02-04-2018, 02:48 PM
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Continuing somewhat destructive de-construction; removed top sheeting of fuse from LE of wing aft. Used punch to remove hatch latch. Tried heat on sheeting but ended up using brute force, a planer, and aggressive sanding tools. Looking to deepen fuselage by an inch and a half or so to make it TLAR. Wood is strange - very brittle - think they call this Luan.

Also began pulling off ailerons and uncovering wing panel.
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Old 02-04-2018, 02:56 PM
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Heat is used where necessary to loosen stubborn areas while pulling off covering.
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Old 02-25-2018, 06:07 PM
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Continued covering removal - now similar treatment to left wing panel. Being Oracover/Ultracoat it's fairly easy to remove.

Closeup of an outboard rib shows one that looks like a warped noodle the mfg is willing to pass as acceptable for general populace.

Began modifying existing construction by adding additional trusses (and weight, of course) to horizontal flying surface - inboard next to center section - looked like it had way too much unsupported area...
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Last edited by H5606; 02-25-2018 at 06:09 PM.
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