Droop Snoot (oz11567)
About this Plan
Droop Snoot. Radio control sport trainer model. For .09 engines and up.
Quote: "Droop Snoot was designed with the beginner in R/C very much in mind. No fancy fillets or round stringered fuselages here, just the essentials. There is ample room for all simple single-control R/C installations. All wood sizes are readily obtainable at your hobby store and the box-type fuselage is easily built. This structure is very strong and will allow for considerable pilot error. The original model hit a parked car on its maiden flight - total damage, a broken prop.
Droop Snoot makes an excellent R/C beginner's model when powered with an 09 engine. Performance will be a bit tamer than the original model which was powered with the K&B-Allyn 15. With the 15 engine the model tears around the sky at a fine clip that should satisfy even the contest-goer.
Model specifications are:
Span 50 in.
Length 36 in.
Weight 50 oz.
Wing area 440 sq in.
Wing loading 11.5 oz/100 sq in.
The model could be built lighter but the additional weight of the structure adds considerable strength since hard balsa was used throughout. This is an important point to remember when purchasing the materials for any radio model. Select medium-hard or hard balsa and birch plywood rather than mahogany if available.
There are two important notes on the plans which should be considered before beginning construction. The fuselage side view shows the engine mounted with 4 degrees downthrust. This will be ade-quate for an 09 engine but a 15 engine will require more downthrust. The plywood side doubler pattern shows firewall angle for both engines so select proper angle for engine you intend to use.
The other note pertains to angle of incidence of the wing. The angle shown produced more nose-up tendency than was desirable. The wing incidence angle should be reduced by lowering the fuse-lage top 3/32 at leading edge, leaving the fuselage the same height at the trail-ing edge shown on the plans.
These two changes are not just arbitrary, they have been proven out in numerous test flights.
Construction can be started with the fuselage. If obtainable use 6 in wide 3/32 sheet for the fuselage sides. If not available, cement 3 in wide sheets together along edge. Pin down on a smooth flat surface to dry. True up one long side of the 6 wide sheet. Most sheets are a bit warped so one edge should be trimmed straight with a plane or razor cut along a steel straight edge.
Mark the position of all formers on the inside surfaces of the sheet in pencil. To do this hold edge over plan side view. Draw former positions across sheet with a square held against the true edge. Lay other fuselage side against first marked and transfer marks to second side. Draw across sheet as before. Cut outlines of fuselage side as shown on side view. Do this to one side then match up other side and mark it for cutting using the first side as a pattern. This method insures identical sides.
Beginning at former #3 cement 1/4 x 1/2 in top longerons and uprights to inside of fuselage sides. Position accurately along former position lines. Though not shown on plans, cement 3/32 or 1/8 sq uprights at former positions 5, 6, 7, and 8 to act as guides and gussets for these formers. Also cement 1/8 sq longerons to top and bottom edges of fuselage rear. While fuselage side assemblies are drying, cut out the 1/16 plywood side doublers for the front end. Use first cut as a pattern for second to insure uniformity. Glue plywood doublers to fuselage sides with hard glue instead of cement. Use Weld-wood or Elmer's Glue-All. Cement 1/16 x 1/2 in strip above doublers then 3/4 x 1/2 in upright at former 2.
Make all formers. Cut plywood firewall 1 and lower part of former 2 to identical width. Cut 1/8 plywood landing gear platform to same width. Formers 3 and 4 should be same width; note that top portion of former 4 is 1/16 plywood while bottom part is plywood. This forms escapement mount.
Study the plans and former drawings carefully so you can make provision for installing the radio equipment you have. Formers should be fitted out now for radio parts before they are assembled to the fuselage sides. Radio installation shown is typical for single-control setup. We prefer to separate heavy components to minimize crash damage. The receiver is the Lorenz two-tuber assembled from an Ace kit..."
Droop Snoot, Air Trails, March 1957.
Direct submission to Outerzone.
Update 02/06/2021: Replaced this plan with a clearer version (redrawn from scratch) thanks to TonyP.
Supplementary file notes
Article pages, thanks to RFJ.
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 commentsNo comments yet for this plan. Got something to say about this one?
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, 2011-2021.
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.