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Old Feb 18, 2015, 09:55 PM
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RickC_RCAV8R's Avatar
Canada, BC, Castlegar
Joined May 2014
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Build Log
RIX Scrachbuild : Ptarmigan

Gentlemen :

I would like as much advice about this build from you guys as I can muster as this is my first scratch-build of an autogyro and my first go with carbon fiber . The skeleton for this model is based upon the Hobby King multi-rotor ROTORBITS building system . A type of Meccano reusable system . I am planning to use a blucor based full fuselage , wing and a pair of fixed engine nacelles at this point . The motors used will be a pair of CF2822's running on 3S twisting 10 x 6 props . Should be lots of power to spare . The tail feathers are not worked out at this point !

PLEASE let me know if this is too crazy an idea to complete before I go too far along with it . At this point , it is completely reuseable as far as the carbon fiber parts are concerned . See my blog for the 1st installment of the build log and thanx for all feedback . Regards : RickC_RCAV8R
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Old Feb 19, 2015, 05:28 AM
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Jockadopolus's Avatar
Scotland
Joined Jan 2010
1,133 Posts
Rick very interesting build keep going
It will need some tail surfaces
I have a project on hold at the moment using ROTORBITS I like the idea of meccano building makes it easy to change the design and repair any damage
We have Ptarmigan birds here in Scotland also a whiskey named after them
Joe
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Old Feb 19, 2015, 11:54 AM
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Canada, BC, Castlegar
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Jock :

Yes , tail feathers for sure . I just don't have those worked out quite yet . I would like to see the rotor in place to measure the rear tilt of them as seen by the tail . 15 degrees mast angle minus the downward flap angle of the blades . (3) The name Ptarmigan was narrowed down from a short list of Canadian birds . The Egret was a close 2nd choice .

Rotorbits is a first go around for me . I like the Meccano approach for this building system . I haven't seen very many postings yet that use this system so I don't know of its popularity . Using the drilling jig with a drill press is a must ! Clean aligned holes every time . Pre-soaking these holes with thin CA glue really aids the threading process . The screws tend NOT to strip out when CA'd . Nylock nuts and bolts are awesome for strength . The current progress of the model include the inner foam wing cores . I will be laminating several thin layers of foam around the carbon fiber wing spars to make it removable . I plan to hold the cores to the spars with silicone .

Spring has sprung in Western Canada at least so it will see the start of the flying season . A short interruption of this project will be seen as I await the rotor head and blades . If I get the rest of the Ptarmigan completed , it should see a maiden flight in May some time . I can learn to fly the Luobo V2 kit that I recently completed until then .

As for the whiskey , I was always a 'single malted' fellow . I developed the taste for it over 30 years ago . Poisoning the drink with the likes of water or ice is uncouth !

Home town : CastleGAR . A Scottish name . Castle ROCK . Thanx for your support Jock .
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Old Feb 21, 2015, 03:37 PM
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Gentlemen :

Just a quick update to let you fellows know that the Ptarmigan is coming along quite well . The foam lamination of the wing is a bit tedious to do but is well worth the effort judging from the results . If I could figure out how to insert the updated image copies HERE , I would do that . Until I grasp that concept , I would just refer you guys to my blog as they are posted there .

The fuselage shell is started as well . I have the lower battery bay installed but not cut out for access yet . Stuffing the avionics into this cramped frame is proving to be an exercise in engineering for sure . Regards to all : RickC_RCAV8R
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Old Feb 23, 2015, 03:08 PM
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Looking great, Keep it up! This is a very interesting model, I highly recommend checkout Rick's blog. Very good cool build.
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Old Feb 23, 2015, 09:32 PM
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Thanx for the great comment Mags ! Just a note for you fellows about the latest update for this project : Engine Nacelles . They are installed on the rough sanded model . The lower fuse is completed as well . See the blog for the update .

Regards to all : RickC_RCAV8R
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Old Feb 24, 2015, 12:10 AM
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Ptarmigan : Nacelles

Gentlemen :

A quick update on the Ptarmigan's engine nacelles . See the blog for the details .
ROTORBITS parts help in the construction for these ones . I have the lower fuse built up , 1st mudded and sanded . The tough part of the project comes next : Upper Fuse .
The wing profile from foam laminations worked out AWESOME !

Regards to all : RickC
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Old Feb 26, 2015, 06:07 PM
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Upper Fuselage Update

Gentlemen :

Just a quick update to let you guys see the progress of the upper fuselage . The details is on my blog for this one . A tricky construction to be able to maintain the proper access to the internal equipment , but that's the way it usually goes . A LOT of planning is done on the breaks in the action .

The temporary LG is being used right now until I can bend up a proper set for prop clearances . What do you guys think of this one so far ?

Regards to all : RickC_RCAV8R
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Old Feb 26, 2015, 10:24 PM
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Elizabeth South Australia 5113
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Looking good.....it's the norm to use MG servos on the head as the plastic ones don't usually cut the mustard.
Chris...
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Old Yesterday, 09:50 PM
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Canada, BC, Castlegar
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Chris :

You bring up a good point about using the metal geared servos . I thought of that but was hoping to 'get away with it ' for the first flights which should be gentler for learning the plane . I have a new pair of servos in the Osprey for my tilt function that could be swapped over . The rest of the parts for the Ptarmigan were shipped from HK yesterday so they won't be here for a few weeks yet . Thanx for this comment though . Regards : RickC
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