Model Forum / Radio Controlled / Air Models / March 2004

I wanted to post a review with the highs and lows of this kit. My son
wanted to start RC flying; I have some experience building and flying, but
haven't done it for quite awhile. I put together a selection of planes
that he might be interested in, and he chose the Rascal 40, immediately.
It obviously has terrific visual appeal. It would not have been my first
choice because of the inverted engine, but I left this to him.

The ARF was ordered from one of the larger mail-order houses, and it
arrived with damaged wings: one panel had the trailing edge cracked and
split, and the other the same on the trailing edge, and the leading edge
busted about a third span from the root. My guess is that someone crushed
the box. We did not actually get started on the airplane until about nine
months after we purchased it, when we discovered the damage (it wasn't
that apparent on a cursory look). I called the house that sent it to us,
and they would not help us out, referring us to Sig. So, I called them
expecting to pay for a new wing panel or complete wing kit. To my
surprise, I was quickly connected to someone in customer service, who sent
out a new wing kit free of charge, cheerfully with no questions asked. Now
that's great service in my book. I was extremely impressed by the degree
to which Sig stands behind their products and customers. The new wings
arrived in a few days, well-packed in bubble-wrap and without any damage.

The building in the kit was of high quality, and the two-tone covering
done very well, with no visible flaws. All it took was a half-hour careful
work with a heat gun and covering iron to get everything tight and
shipshape. The hardware supplied was very complete, all usable and of good
design, with the exception of the motor mount plates, which I thought were
insufficiently robust (though I've seen them on other folks' Rascals).
These are two hard aluminum things about 1/2" wide by 2-1/2" long, 3/32"
thick, that are the intermediate pieces between the motor mount lugs and
the hardwood beams glued into the fuselage. I chose to make a one-piece
plate of 3/32" aluminum plate, double it at the mounting lugs, and
basically fill the space between the hardwood beams. In general, it was a
bit confusing that the smaller screws all seem to be metric thread, and
some of the larger ones SAE. Maybe I've just been out of things too long,
and I certainly didn't have a stock of metric spare parts (but now I do).

Until I received the kit, I had notions of side or upright mounting a
reliable old 2-stroke .46, modifying the front end to suit this. As it
turns out, the thrust line is quite high on the fuselage, meaning that you
can't get a tank mounted high enough to have a proper relationship to the
carburetor, unless the engine is inverted, as the ship is designed. So
instead, we sprung for a new 4-stroke Enya 53, a beautiful and
well-behaved engine, I must say.

The fuselage is narrow for anyone with large hands. Having the engine
cowled, except at the bottom, makes it difficult to install, particularly
if you're using a 4-stroke with the carburetor in the rear -- adjustments
and connections are not easily made. I had suspected this would be the
case, but I just worked through it, though it took a lot of time and
forethought. In retrospect, it might have been better to chop away the
fuselage sides below the motor mounts, and just make a fiberglass cowl. If
Sig were looking to improve this model, I'd suggest that they eliminate
the beam motor mounts, thicken the firewall to 1/4" for a reinf. plastic
mount (it's about 3/16"), and provide a fiberglass or even plastic cowl to
keep the good looks.

The landing gear mount is too wimpy for my taste --just a softwood block
about 2" wide at the bottom of the fuselage. I added about 1/4" of
basswood, in a U-shape extending from the former at the wing leading edge
back along the bottom corners of the fuselage sides 4"; and I capped this
with 3/32" ply. The ply doublers of the fuselage have some material down
there to glue such a reinforcement to. For the gear itself, I tossed the
10-32 steel landing gear bolts, and substituted 1/4-20 nylon ones. Inside
I provided a thick, unglued block threaded for the bolts, faced with 1/16"
3M foam tape. I put similar tape between the aluminum gear and the
fuselage, and made a 3/32" washer plate beneath the gear center section,
also faced with foam tape. This made a rather shock absorbing assembly
that proved itself when on the second take-off, in a crosswind, the plane
ran off the runway, popping the gear without damage to the fuselage.

Another modification I made was to remove some material from the fuselage
formers ahead of the wing, to rotate the tank 90 degrees and get some foam
around it, so as to prevent fuel foaming. It's a fairly tight fit as the
kit comes. The tank is 260 cc capacity (about 10.5 oz), plenty large for
any engine in the displacement range recommended. Finally, we made the
tailfeathers removable, so that the model could be boxed and shipped
cross-country, but this certainly is not necessary. This was easy to do
with a plywood plate beneath the stabilizer, and some bolts through the
solid material at the center section.

The rest of the completion and radio installation was a piece of cake.
Servos installed in the plywood plate they provide, receiver and battery
installed ahead of them; the plane balanced perfectly. I'm not a great fan
of the nylon tube-within-tube pushrods for the elevator and aileron, but
we used them because doing otherwise would involve a lot more work, and
they seem to work acceptably. I used the mixing functions on our computer
radio to do differential with the two aileron servos. The tailgear is very
nice, a Haigh-style made with an aluminum plate. When bolted together, the
wing aligned straight and true in plan, though one tip was a bit lower
than the other with respect to the fuselage sides. This was shimmed out.

I did not weigh the plane, but even with five servos, a 4-stroke engine
and a 1000 mAh battery, I know it is light for its size and area. The
two-piece wing makes it a snap to transport in a car.

On its first flight, it seemed to have no bad habits; took off straight
down the runway, would fly very slowly, controls had authority whether
full or dual-rates were used. Ground handling was excellent, from what I
could see. My son had a blast of course, and the experienced pilot helping
us said that he couldn't imagine a better airplane for our purpose. It's
large enough to see well, it flies great, and it's light, but penetrates
decently too.

In conclusion, I recommend this airplane without hesitation, so long as
you don't expect to build it at the flying field. Someone should be
prepared to do a bit of work to improve the few shortcomings detailed
above, but from what I read here and in the magazines, that sounds like
it's pretty common with ARFs made by anyone. The instruction booklet was
excellent, written in plain (native) English supplemented lots of photos.
Now that I know what changes to make, and how to make them, I could build
out another in short order.