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Author Topic: Planarian!  (Read 2803 times)
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danmellor
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« on: May 25, 2013, 02:13:20 PM »

Hi all,

Just started work on a new Planarian; Barnaby Wainfan's lifting bodied canard pusher Bostonian. I have built three of these in the past and it's a great design, not to mention looking interestingly freaky, too! There will be slight mods. from the plan, in the interests of ease of construction and strength. As my last two have turned out sub 14g, I can afford a little extra wood here and there, especially as it's debut outing will be the evening carnage in the Barkston hangar at our UK August Nats...

Cheers,

Dan.
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danmellor
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« Reply #1 on: May 25, 2013, 02:46:14 PM »

Mod. No.1... The plan and article shows the rectangular base of the forward fus. built up over the plan as normal, then the two sides erected in mid-air. This is frankly mental! I will be building two sides in time honoured fashion and joining them over the plan view as usual. I've just laminated two strips of 1/16" square for the top longerons with that in mind. The plan just has one strip bent and glued in situ. Other, more skilled than I, may be able to manage this without horrible alignment problems, but I ain't even trying! The pieces in question will be 1/16" by 1/8" instead of the original 1/16" square, but as all my previous builds have needed noseweight, I don't mind...

Cheers,

Dan.
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danmellor
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« Reply #2 on: May 28, 2013, 03:14:16 PM »

Both underfins built and most of fuselage structure together. Look at this pic and then imagine trying to build both sides in mid air, up from the plan! Barmy...

Cheers,

Dan.
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Russ Lister
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« Reply #3 on: May 28, 2013, 03:18:02 PM »

Looking good Dan  Smiley ... fancied building one myself a few times, but just enjoy designing my own so much.
I've got a 'MkII' lifting body drawn up but still not had chance to build.
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danmellor
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« Reply #4 on: May 28, 2013, 03:54:28 PM »

I know what you mean Russ. I'd have to up my alcohol intake and start on the hallucinogenics to come up with something like the Planarian, though...

Cheers,

Dan.
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Sky9pilot
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« Reply #5 on: May 28, 2013, 09:14:53 PM »

Dan,

I've never seen a planarian before.  This is really an intriguing model. I shall follow this with great interest!  Looking forward to next installment.

Tom
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« Reply #6 on: May 29, 2013, 09:18:00 AM »

I vaguely recall seeing a photo of one many moons ago, but at the time I was immersed in rc.  Where is the plan or photos/article to be found?
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danmellor
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« Reply #7 on: May 31, 2013, 06:01:15 PM »

Fus. is now finished and rib templates for both wing and foreplane made. If anybody else fancies building one, it's violently unstable with the foreplane dihedral shown on the plan. Needs to be at least double to avoid spiral instability.

Would have done a little more tonight but I'm knackered!

Cheers,

Dan.
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Dave Andreski
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« Reply #8 on: May 31, 2013, 06:39:21 PM »

Dan,
The foreplane dihedral needs to be greater than what's shown here?
Dave
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PB_guy
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« Reply #9 on: May 31, 2013, 08:30:37 PM »

Try https://library.modelaviation.com/ma/1987/9
for the article and plan (pg 57,58,87,90)
Ian
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Dave Andreski
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« Reply #10 on: June 01, 2013, 09:27:19 AM »

Try https://library.modelaviation.com/ma/1987/9
for the article and plan (pg 57,58,87,90)
Ian

I assumed Dan already had the article. Maybe I was wrong?
Dave
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« Reply #11 on: June 01, 2013, 12:19:02 PM »

This was more for others (lurkers?) who are curious about the construction article and plan.
A search using google doesn't show up much.
Ian
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Dave Andreski
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« Reply #12 on: June 01, 2013, 12:42:56 PM »

This was more for others (lurkers?) who are curious about the construction article and plan.

Ian

Hi Ian,
Yes, I understood your post.
I'm anxiuos to see how much foreplane dihedral Dan used on his previous/first? Planarian.
Dave
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« Reply #13 on: June 01, 2013, 01:34:24 PM »

Perhaps he meant incidence instead of dihedral? Lack of sleep confuses us.
Ian
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Dave Andreski
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« Reply #14 on: June 01, 2013, 01:36:33 PM »

Perhaps he meant incidence instead of dihedral? Lack of sleep confuses us.
Ian
Could be...we'll see.
Dave
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danmellor
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« Reply #15 on: June 01, 2013, 01:37:19 PM »

The foreplane dihedral shown in the article pics is about right. The measurement shown on the plan doesn't produce nearly as much! I assume that the given measurement should be under each tip, not just one. The last one I built was according to plan and it would spiral in on anything above half turns.

Dan.
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danmellor
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« Reply #16 on: June 01, 2013, 01:39:05 PM »

P.S Not sure how incidence would affect spiral stability...
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Dave Andreski
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« Reply #17 on: June 01, 2013, 01:54:13 PM »

The foreplane dihedral shown in the article pics is about right. The measurement shown on the plan doesn't produce nearly as much!
Dan.

And therein lies the problem.
Dave
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danmellor
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« Reply #18 on: June 01, 2013, 04:36:21 PM »

A little more progress tonight. Fuselage now finished and ready for covering, set of wing ribs cut and prop blades cut, sanded, soaked and bound to an empty cider can! I'm making a pusher prop (Anti-clockwise rotation, viewed from the rear) so I don't have to remember to wind the damn thing backwards!

Dan.
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danmellor
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« Reply #19 on: June 02, 2013, 12:20:56 PM »

A little further on! Main wing built. As the full wing is not drawn on the plan, I scaled it to give a chord of 3", the maximum permissable under Bostonian rules. This made the span look oversized when the wing drawing was put together but propping up the tips to the required dihedral gives a span of 16"!

Just the foreplane to go...

Dan.
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danmellor
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« Reply #20 on: June 03, 2013, 02:43:08 PM »

Quick mock up...
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danmellor
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« Reply #21 on: June 03, 2013, 03:15:47 PM »

And another...
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Pit
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« Reply #22 on: June 04, 2013, 02:37:25 PM »

Definitely WIERD!  Can hardly wait (hint Wink Grin)!
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danmellor
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« Reply #23 on: June 05, 2013, 04:39:11 PM »

Pusher prop made! Blades moulded around an empty beer can(!) and hardwood dowel roots into an alum. tube hub. Tack glued in so pitch can be adjusted if needs be.

Cheers,

Dan.
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danmellor
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« Reply #24 on: June 11, 2013, 12:44:54 PM »

Covering well underway. Just done what is, for me, the worst part of the build: covering the transition between the triangular boom and the fus. pod. Not fun...!

Cheers,

Dan.
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