About this Plan
Terrier. Radio control sport model for .25 power.
Quote: "Third in a series of designs which have been refined to get the best performance from a standard .25 engine... the size of most .40 and some .60 aircraft, but uses a standard economical .25 engine. I used the OS .25 (non-Schneurle) on my Terrier because it idles very slow and will run about eleven minutes on four ounces of 10% nitro fuel.
Take-offs are easy - just gentle rudder input to steer, hold about 1/3 back stick and the Terrier will do a beautiful, smooth take-off every time. If you like the hot dog type, just let the tail come up, steer with the rudder until you are really moving, then haul the stick back and you are off! Remember, on this kind of climb-out to hold some right rudder - you will need it.
Aerobatic maneuvers of all kinds can be done with the Terrier. It will do the usual loops, rolls, spins, snap rolls, and hammerheads with ease and, with a little practice on your piloting technique, you will be doing 4-point rolls, tail slides, double snap rolls, snap on top of loops, square loops, and many others. Due to the Terrier's slow flying speed and low stall speed, you will be able to do all these maneuvers right in front of you! No more far away turnarounds setting up for the next maneuver.
In addition to these maneuvers, you will be pleased to discover that the Terrier will also do a lot of outside maneuvers. Outside loops, outside snap rolls, outside loops with outside snaps, and inverted spins are all easily done with the Terrier. Spins and snaps, both inside and outside, can be stopped very easily merely by releasing the controls. Low and slow flying is easy, using a nose high attitude and 1/4 to 1/3 throttle..."
Scanning by Don at EAC, cleanup by theshadow.
Supplementary file notes
Article pages, text and pics.
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
by Al Clark
from RCMplans (ref:909)
IC R/C LowWing
all formers complete :)
got article :)
Found online 14/04/2015 at:
Format: • PDFbitmap
Credit*: Balsaworkbench, theshadow
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsHi Steve, Glad to finally see this fine RCM plan available on your wonderful site. I built a Terrier from scratch (including scaling up & drawing the plans right from the magazine page) nearly 20 years ago. Still have it, fully intact after wearing out the engine. Wonderfully easy to build, and a superb flyer with an O.S. .25 FP engine, 9x4 or 9x6 prop and 4 standard size servos. Would probably fly ok on a .19, but would probably be overpowered with anything more than a hot ball bearing Schneurle ported .25. Definitely don't recommend trying a .40 on it. Would probably make a great electric conversion without deviation from the plans, as the construction is quite robust yet very lightly built. Mine flew straight right off the building board, requiring nothing more than 2 clicks of left aileron trim. Two circuits around the flying field to get a feel for the response and then proceeded to put it through every aerobatic maneuver I was capable of on it's maiden flight. Low landing speed with no tendency towards tip stalls. Absolutely no evil tendencies in this ship. After a wonderful write up like this, I need to rebuild the engine and put mine back in the air! I highly recommend this plane for anybody who is competent with a basic 4 channel trainer and who is looking for a good mid-sized sport plane. I'll take a photo or two of mine some time this week and send them in to add to the plans.
BillyMcCaskill - 19/04/2015
When I saw this plan in RCM I ordered it right away. I liked Al Clark's design philosophy and the look of the model. It was my first "scratch" built plane [see more pics 003]. Four stroke model engines were new and I had this brand new O.S. 40 four stroke which had about the same horsepower as a standard 25, so that's what I used. I moved the firewall back 3/4" to compensate for the added weight of the engine. I'd like to say the plane flew but a radio problem ended the flight right after take off. A few months later two of my modelling friends and I got together and in one Saturday morning we "manufactured" parts for 3 planes. The plan was to show up at the club meeting with all three models on the same night, which we did. The response was great. My Terrier, with the 40 four stroke flew just great. It was a little heavier with my engine choice but it made beautiful low & slow passes with that 4-stroke sound. It also made beautiful hammer head turns. One bystander said that after seeing my Terrier fly he was going to build one. After several years of flying Terrier number two it was lost while trying to perform a 1/2 loop from inverted resulting in a "figure 9". It was such a nice flying plane I had to build another one. The third Terrier was built and I flew #3 for about 5 years [see more pics 004]. When I brought it out in the spring I found I had to replace the fin and horizontal stabilizer because of warping over the winter. On its maiden flight after the repair the stab folded after a loop and that was the end of #3. When I built #3 I made a second set of parts which I still have. They have been calling to me for some time. I still have that trusty old 40 four stroke.............. I have also thought it would make an great electric conversion.
MikeHausner - 08/10/2015
Steve/Mary, here are pictures of my Terrier [more pics 005, 006]. I just wanted to add my support for this great plane. O.S. FS.40, Polyspan covering.
JimHales - 06/06/2017
It's a pleasure to welcome Elvis to Outerzone! [more pics 005, 006]
Mary - 06/06/2017
The Terrier was probably the first aerobatic model that I built, in the 80's I think. It was a fine handling aircraft with no vices, a real pleasure. I wish I could remember what happened to it but that is what ageing does to me.
Fred - 14/06/2020
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.