Bi Prentice (oz12652)
About this Plan
Bi Prentice. Radio control sport biplane model. Wingspan 62 in, wing area 1017 sq in, for .29 to .50 engines.
Note the orginal Apprentice (oz10199), was first published in MAN May 1968. This here is later (biplane) version. Bublished without any photos, in MB 1971.
Quote: "From time to time, if our readers express enough interest in the idea, we would like to present construction projects which are, in a certain sense, incomplete. An example of what we have in mind is this month's presentation, the Bi-Prentice.
The usual construction article is of a proven design, such as Jack Elam's glider in this issue. The article includes, in addition to the plans, several photographs of the model, and a text which gives some background and/or accomplishments of the model, along with instructions for building. This type of presentation is pretty much standard throughout model publications.
There is, however, a large untapped source of designs that never reach the modeling public. These are the ones created by designers who do not always have the time or opportunity to build, test fly, and photograph every model they put on drawing paper. There are also many tested designs that don't get published; sometimes it's lack of photographs, sometimes the designers don't have the desire to put together a text.
It is not our intention to present wild, far out (unless they've been tried) figments of the imagination that some kook may have dreamed up while on a trip, but rather, good modeling projects that if not published incomplete, might never get published at all. If you have something that fits the description, drop us a note about it. We'd also like to know your opinion on the idea.
The Bi-Prentice was a follow-up design to our Apprentice (oz10199), which was published in the May 1968 issue of MAN. By making only minor changes in the flying surfaces, and designing a new fuselage, we came up with a biplane version. One Bi-Prentice was built and flown by Rudy Black, a modeling buddy from Delaware. The only problem he had was cured when he moved the balance point forward to the location indicated!
As with the Apprentice, this airplane is designed for rudder, elevator, and engine speed control. Ailerons are unnecessary. Engine size needed wil. depend on your building habits. A gooc .29 would fly a 4 pounder in a calm fashion. For 5 to 5 1/2 pounds a .45 or or.50 would be just right. A .60 should only be necessary if you're inclined toward lead-sleds.
Don't be afraid of the coat-hanger cabane struts. They're plenty tough when used as shown, and are much easier to work with than music wire."
Direct submission to Outerzone.
Supplementary file notes
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.