McCann-ard 27 (oz4833)
About this Plan
McCann-ard 27. Free flight canard model for Cox .010 power.
Quote: "To test out this revised layout, a small (27in span) model was built powered by a TD .010 and this model is a real pleasure to fly. It seems to be quite free from vices and stability is impressive. In spite of such a small engine (which actually develops suprising power) the climb is very steep and 'on rails', and the glide very good. The layout thus arrived at seems to be the most promising for duration canards, and will give conventional models a run for their money. Development is still continuing and the author won't be content until competition results show the Canard to be superior!
During the year the following points have been noted about Canard building and flying:
1. Side area ahead of the CG should be kept to a minimum, with a single large fin to be most satisfactory.
2. An elevated leading plane increases stability, and reduces need for large angles of incidence, which bring the leading plane nearer to the stall. Canards are sensitive to leading plane alignment, it must be 'square' in all respects. The reason for the cranked fuselage, is to raise the leading plane without having to use a pylon, which would increase side area.
3. Wing to be at 0° incidence. Various angles have been tried. with compensating increases to leading plane incidence to maintain longitudinal dihedral_ Increasing wing incidence makes the model hang back on the climb and appears to increase sinking speed on the glide.
4. CG position. Various formulae have been put forward to determine CG position, but these seem to give only an approximate position. Rigging angles also determine CG position. and it is only finalised during trimming. Trimming is merely a matter of locating the CG by gliding tests then producing a left turn by rudder tab alone. Warps and offsets are not required.
5. Angle of climb. It appears that this can be varied by altering the leading plane incidence. with a compensat-ing correction of CG position. Increasing incidence steepens the climb and vice versa. Providing extremes are avoided, the author's Canards have not shown any looping tendencies, possibly due to the high thrust line.
6. Wind penetration. Increasing wind velocity has, in the author's models, produced a slightly shallower climb, the high thrust leaning the model with the wind. The straight into wind climb is no doubt aided by the wing being at the rear. This is the largest component producing drag, and being well behind the CG, gives weathercock stability.
It is hoped that interest may be stimulated in Canards. They have proved a stimulating mental exercise and arouse interest whenever they are flown. The author is convinced that a little more effort devoted to Canards will produce a duration machine capable of rivalling the performance of conventional pylon models, which, even though they have had many years development, still have a lot to be desired. All the author's larger models have used GO 795 For both wing and leading plane sections, which in practice have proven to be excellent.
For those wishing to build a Canard, full size plans of McCann-ard 27 are given here. This model incor-porates the lessons learned during a year of Canard flying and is simple to fly and success assured. The following notes will assist the building and flying of McCann-and 27.
Fuselage. Medium hard, 1/4 in thick straight grained balsa is used. Carefully pre-cement all fuselage joints for maximum strength. The two parts forming the fuselage are first assembled, followed by the motor pylon and nacelle sides, carved and sanded to section. At this stage the tank is installed..."
Direct submission to Outerzone.
Update 09/07/2019: Have re-scaled this plan up to correct full size at 27 in span.
Supplementary file notes
Article pages, text and pics.
Previous scan version.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsHere's our MaCann-ard 27 free flight converted to electric [more pics 004-007]. 4600kv motor, 2-cell 160mah lipo battery and a Brodak timer. Very easy to trim out. On only 68% power climb out is almost vertical and transition to glide seamless. Enlarged the plan to 36" for E-36 competition. Should be a "goin' concern"! Powered by Cricket Wireless.
RandyW - 07/05/2018
Here are some pictures of my model McCan-ard, Plan ID=4833 (with some modifications to RC) [more pics 008, 009] and 2 minutes of film https://www.youtube.com/watch?v=igq7yg-Ip4A&feature=youtu.be.
TomasDunker_Sweden - 18/06/2018
Here is our McCann-ard E-20 [more pics 010]. 20" wingspan free flight.
TeamWrisley - 10/07/2018
The plan prints out with a 25" wingspan, not 27"
TeamWrisley - 09/07/2019
Thanks, have fixed this now.
SteveWMD - 09/07/2019
Hi Steve, I attached my McCann-ard from Outerzone [main model pic]. I had this .010 Cox many years, not knowing what to do with it. Through your site I discovered March 1963 Aeromodeller (I was born exactly then) featured the very same. Had to build it. Flies almost too well. Rgds,
AdrianD - 11/02/2020
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2020.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.