I have built a good number of Guillow kits and have had good success with most of them. There are some modifications I have made for doing stretch winding and have replaced some of the heavier balsa. On some the kits I have left out parts or redesigned the tail surface to be lighter.
In this webpage I hope to give beginners some ideas to try to have a more successful building and flying experience with Guillow’s models.
Selection of Guillow’s Kits at Local Hardware Store
Whether you like the contents of the box a Guillow’s kit comes in, everyone agrees Guillow has some very attractive packaging. No doubt Guillow kits are found on more store shelves than any other model airplane kit and sold by a huge number of online outlets. The company has survived the test of time with beginnings in 1926 founded by Paul K. Guillow.
About the Balsa Wood
Although these kits have been known to contain some of the heaviest balsa and were designed with too much balsa in places, the newer kits are coming with lighter balsa and designed with less balsa. New design kits come with laser-cut balsa and many of the older designs have been re-done with laser-cut wood.
Wood in Guillow Edge 540 kit is laser-cut, well marked, and of reasonable weight.
Too Much Wood in Design
In some Guillow kits the fuselage sides were made from balsa sheet instead square sticks, even with the cutout areas the larger amount of balsa resulted in greater weight. If the balsa was a really heavy density the weight was substantial.
Too Much Balsa in the Tail
In this view of the stabilizer of the Cessna 150 it can be seen that there is much larger wood used than in most rubber powered models of this size. As I was converting this airplane for radio control I thought the larger wood size to be fine.
The big problem with a heavier tail structure is often much extra nose weight is needed in the nose of the airplane to counterbalance the heavy tail.
The Rubber Motor
Duration of the Rubber Motor Run
How long the propeller will spin the propeller before completely unwinding is limited to how many turns can be stored in the length of rubber. This will determine how long the power phase of the flight will be. If the airplane can climb and then level off with a limited amount of thrust required, the propeller can turn slower and use up the turns slower. Propellers for rubber powered airplanes will normally be larger than propellers that would be on a similar sized airplane using an electric or gas motor which would spin the propeller faster. To fly the airplane on less thrust, the model airplane needs to be built very light which means less lift needs to be created to counteract the weight. The rubber motor can provide a good amount of energy for it’s weight.
The rubber provided in the Guillow’s kits is not regarded as being the best quality for extended flight. The rubber that you will want to obtain is produced through FAI Model Supply but many other vendors distribute their rubber strip in different sizes and quantities.
Sources For a Better Rubber Motor
F.A.I. Tan Super Sport Rubber
Access to Rubber Motor in Enclosed Fuselage
For models with a full-width fuselage that encloses the rubber motor a method is needed to access the rubber motor for replacement and for stretch winding. As shown on the plans it assumes that you will install the included rubber motor and never change it as there are no openings shown in the front or the rear of the model.
For extended flight times and to be able to fly your model more than a few times, easy access is needed to change the rubber motor and room to push a “blast tube” inside of the fuselage. The blast tube encloses the rubber motor while it is being wound in case the rubber motor breaks which can destroy the fuselage.
ArmorAll and Son of a Gun are Spray Lubricants Found in Automotive Supply
Rubber motors should be inspected frequently for nicks and replaced with a new motor before the current rubber motor breaks. The rubber motor should also be frequently lubricated also between flights.
Common practice is to put rubber motors in sealable plastic bag, spray in lubricant, and rub it into the motors from outside the bag.
Removeable Nose Piece
Access for the rubber motor and blast tube is normally needed from the front of the model. In most cases the entire front of the nose must be removed so there is room for the blast tube to enter the fuselage. This removeable nose must be fastened to the fuselage by some method or it will fall off as the tension of the rubber motor weakens towards the end of the flight.
The best methods I have found to hold the nose are creating enough area of friction behind the nose with the inside of the fuselage or by using tiny neodymium magnets.
Neodymium magnets Super Cub coming in for landing
hold cowl in place.
If there is enough friction between nose piece and inside of the fuselage the nose should stay on.
For this Guillow’s Lancer I put foam on the insides of fuselage nose area to put pressure and grip to the balsa nose piece.
Result of Improper Fastening of the Nose Piece
Before installing the magnets on the nose of the Guillow Super Cub 95 the nose piece and propeller could be seen dangling by the rubber motor at the end of the flight.
The Winding Stooge
Guillow’s Flyboy seen attached to stooge from Midwest Products that appears to be no longer available.
A mechanical winder is used to put the turns in the rubber strip, this low cost 5 to 1 winder
is only suitable for the smaller rubber models.
When winding with a mechanical winder normally a “stooge” is used to hold the model through the rear hook. An aluminum tube is used for the rear hook and a stiff wire passes through the center of the tube while going through holes in the stooge. In this manner the tension of winding the rubber is not put on the airplane until the wire is pulled out.
A stiff music wire passes through the holes on the two sides of the stooge.
In place of the wood dowel included in the kit, an aluminum tube is used that will slide in and out of holes in the fuselage.
This view shows the wire passing through sides of stooge and through the aluminum tube inside of the airplane.
An opening is needed to gain access at the rear hook of an airplane with a full width fuselage. The opening is normally a rectangle cut out of the tissue on the bottom of the fuselage in the area of the rear hook. To change out the motor the tube is pulled out and the new rubber must loop around the rear hook tube when it is inserted back in the fuselage.
Winding With a Blast Tube
The brass tube used as a blast tube is much heavier than needed, normally blast tubes are plastic. The length of wire with bend on each end is to allow the blast tube to be slipped over the wire and then you grab the rubber and attach to the propeller shaft.
The Guillow Number Series of Kits
Guillow’s catergorizes their models into number series starting at 200 and increasing sequentially by 100 to 1000 and then jumping up by random gaps. I have built some models in different series but in some series I have not built any of the models. In the 4000 series – Simple Build n’Fly I have built all of the models. In the 600 series – Simple Build-by-Number I have built all the models with the exception of the Javelin.
The following are images and experiences I have had with the Guillow models I have built:
300 Series – Private Planes
In this series I first started building the DHC-2 Beaver kit which is one of the newer designed airplanes. The wood didn’t seem real heavy but there was a lot of it in the structure of the airplane. After I started building I decided this might make a good airplane for electric radio control with the equipment from the popular electric Champ.
This was my first conversion of a rubber powered model to electric RC and maybe just by luck it worked out well. The power was adequate but I had to stuff a fair amount of weight in the cowling for proper balance. I have flown this plane many times both outdoors and indoors although it is rather fast for indoors. With a slight dive the airplane will loop.
As my DHC-2 Beaver construction was progressing I thought ahead at the next rubber
model I would convert to electric RC and purchased the Guillow’s Cessna 150 kit. This was a newer kit that had lightweight wood that was laser-cut. For electric parts I decided to use a more powerful brushless motor and slightly larger servos. Working with the light wood and trying to install radio equipment I broke the airplane several times during construction. For covering I used Microlite plastic covering for the first time which was a real challenge. On the fuselage the covering pulled in too tight with the heat shrinking and bent the stringers.
The first flight of the Cessna it was apparent the airplane had plenty of power, but it never controlled very well. On the second flight even flying at half throttle I ripped one wing off. In repairing and strengthening the wing joint I ended up with less dihedral and worse control. Adding more dihedral back in the airplane still didn’t control very well. If I had used the lighter equipment and less power as in the Beaver it might have flown well, no doubt it can fly well as a rubber powered free flight.
I have the construction of the PC-6 Porter kit almost done. This is one of the newer laser-cut kits that has lighter wood. My criteria for selecting this kit was that Don DeLoach had written a review of this airplane for Model Aviation magazine October 2013 that was rather positive. Looking at the design of the airplane it has a rather long nose which should make for easier balance without nose weight. The wingspan is 26 inches so it is a fairly large airplane.
Update 5-26-2015 – PC 6 Porter Flies
Although there are no decals or trim on the airplane, I flew the PC-6 Porter over tall grass and was really impressed how well it flies. The flight path is a circle to the left under power, I might change trim to right but the balance appears to be near perfect without having to add any weight. Weight without rubber is 39 grams, so far only a single loop of 3/16″ has been tried, two loops of 1/4″ should give a steeper climb. It was rather dark when flying, I will try to get better pictures and video.
Update 6/2/2015 – Two Loops of 1/8″ Rubber
With two loops of 1/8″ rubber the climb is steeper but now it tends to stall on the first part of the flight during the power burst, additional trim adjustments needed.
The cowl was shimmed slightly to the right so the airplane flies to the right which appear to have eliminated the stall.
600 Series – Simple Build-by-Number
The first Guillow kit I built was the Cessna 180 back when I was in elementary school, for whatever reason I gave up on the fuselage and used a balsa stick to attach all the flying surfaces to. I have a memory of flying the airplane in front of my parents house.
A couple of years ago I decided to build another Cessna 180 including the fuselage. Construction went well although I had a hard time covering the top of the wing without wrinkles because I tried to cover each half with a single sheet of tissue. I tried flying with the stock 6” Guillow’s propeller and later installed a larger Peck propeller. Flights were always on the edge of a stall as the airplane was just too heavy.
Super Cub 95
Constructing the Super Cub 95 is almost identical to the Cessna 180, but I decided in building the Super Cub I would build it much lighter. The biggest weight savings was by building the tail surfaces from 1/16” square balsa with the outside curved pieces formed wet around a form.
I also substituted some of the strip wood in the kit with lighter balsa. Again flying started with the stock Guillow’s propeller which I replaced with a larger Peck propeller. What a difference building lighter made, this plane flew so much better and for a much longer duration.
The Javelin and Lancer designs are very similar with the difference being the Lancer has a cabin area with a windshield in the fuselage. In the Lancer kit I built the wood was pretty light and I built just like the plans except for making a removeable nose that had a tight friction fit with foam inside of the fuselage. For the landing gear I made it removeable by holding it on by a rubber band. For a propeller I used the larger black propeller that came in DHC-2 Beaver kit, covering was Esaki tissue.
My first flights were with the landing gear attached but I soon determined the airplane flew better without the landing gear. For power I had single loop of 3/16” rubber to start with but changed to 1/8” rubber in two loops for a faster climb. My Lancer always flew well but never glided very well. Other people have mentioned that with Lancer and Javelin, many people think it is because the airfoil is too thick. Sometime I would like to build a thinner wing for my Lancer but for flying from smaller fields the shorter glide is a good thing.
Adding Fuse DT to Lancer
I wanted to experiment with using the traditional fuse DT so modified my Lancer for DT the front of the wing pops up on DT bringing it quickly down.
Blog article: I Have a Short Fuse – on my Guillow’s Lancer
700 – Built light, great flying Kits
I have not yet built any of the airplanes in this series but I do have the Edge 540 kit which looks good. The wood appears to be light and the design is such that there is less wood than many of the other airplanes. From what I have read the Fairchild 24 and the Arrow are great flyers.
900 Series – Easy to Build Scale Flying
I had done the major amount of construction on a P-51D Mustang a couple of years ago and then moved on to other projects, I plan to work on it again. Not laser-cut but the balsa appeared to be rather light.
This is a completed Guillow’s P-51D by Keith Widmann.
4000 – Simple Build n’ Fly Series
I started with the most difficult model in this series first, the Flyboy. In that I have been building model airplanes for a long time it wasn’t a problem but if you are a beginner I suggest starting with an easier model.
The Flyboy took the longest to build just because of the larger number of pieces in the kit. The structure is the more conventional type of many small square strips glued together to make up the fuselage. I did add tiny dowels to hold the wing on instead of using a large rubber band over the fuselage as shown on the plans. I might have saved a little weight by drilling 4 holes in each plastic wheel. Covering was lighter also and not what was provided in the kit. No doubt a bigger propeller might have improved performance further. I never took any pictures during construction but have a good number of pictures of it flying.
I have built two Cloud Busters with the hope that I could improve performance on the second Cloud Buster by building it lighter and using a larger propeller assembly. To try to save weight on the second model I cut holes in the wing ribs, looking back I saved very little weight and I really could not tell that the lighter plane flew any better. If I were to build another one I would only cover one side of the tail surfaces.
On the first Cloud Buster I had installed heavier landing gear to give the airplane more nose weight. It would be better to move the wing pylon further back to achieve proper balance.
Construction pictures of the first Cloud Buster I built. The last wing rib at the tip is very fragile because of the cutout for the spar and because it is so thin.
I no longer have my Cadet model, one suggestion is to modify the propeller hub to something that supports the propeller shaft better.
Hand launch gliders would seem simple as there are few parts of a heavy wood so the airplane is not easily broken during construction. The tougher part is adjusting and launching the glider. A glider goes through a high-speed launch phase and then must transition into a slow glide. If it is not thrown just right and adjusted correctly it can dive straight into the ground after launch. Some people complain the balsa fuselage breaks to easily. After hand launching my Goldwing I put a hook on the fuselage to convert it to a catapult glider, this worked well for me.
https://youtu.be/KF3xbyI3tPg Mark Batterson Arrow
https://youtu.be/Toh845PYRhw Cessna 150
https://youtu.be/LymFNcBrcHM Douglas Skyraider
https://youtu.be/hYYo_7WMd_E Beaver on Floats
http://www.guillow.com Guillow’s Company Website
Guillow’s Model Builder’s Forum – a great resource to interact with other builders of Guillow’s model aircraft.
All Balsa Airplanes and Gliders
Guillow’s sells a huge number of all balsa airplanes that can be slipped together without glue. Trouble is without glue the parts often shift which causes more flight problems. Often the stability of these airplanes is lacking and slight modifications can correct this. The rubber motor included is not designed for a large number of winds.
Several years ago I created a webpage on modifying the Strato Streek rubber powered slip together airplane, I basically replaced the rubber motor and added more dihedral and the plane flew well. Other people have created tutorials about modifying these airplanes that are much better than what I had done so I am providing the links to those resources.
Improving Your Guillows Sky Streek by Gary this is a very detailed web tutorial. There is a video at the end of this airplane flying well over one minute.
From AMA Flight School Video Tutorial – How do I Modify Stock Rubber Powered Model
with Dave Gee (Stuka Dave)
Catapult Glider Upgrade Video by Dave Gee