I am looking for some opinions here: After an unfortunate series of
events with my Cub (that started when the wheels left the ground this
afternoon... ), I am left with an orphaned OS 70 Surpass II 4 stroke.
Coincidentally, I have a Sig 4 Star 40 kit that I have been holding on
to, and never built. What do the people familiar with the 4 Star 40
think of the combination of the 2?
I know the specs call for a .40 - .50 4 stroke, so this is on the
large side... I am NOT an aggressive pilot, so this isn't to
over-power the plane, just to make use of the engine and kit and get a
new plane back in the air sooner. I was eventually going to buy a
Saito .56 for the 4 Star, but haven't been able to yet (which is why I
still have the kit laying around! :-)
So, what does everyone think, or even better, has anyone tried it (and
the plane lived to tell about it?
My other option is to build another plane for the 70 4-stroke - I was
considering the GP Ultimate Bipe (specs say 70 4-stroke will work).
It is more aerobatic than I need, but it would be fun to build and fly
a biplane (I think)...
What do I think? Absurd. The Four Star 40 is overpowered by today's
My opinion is that you won't enjoy it with a 70 Surpass, especially if
you're not an aggressive flyer. Buy an Astro Hog and put the 70
Surpass in that instead. Makes a good excuse to buy another kit and
the Hog and a 70 Surpass make a wonderful combo. Terms of Reference:
Flown Four Star 40 with Enya .53 four stroke and seen a gazillion of
'em fly with Saito, OS and Enya fitouts (my own has a Super Tigre S40K
in it, the Enya CX45 was tested and considered overkill) and the Hog
with a 70 Surpass. Hear all the usual crap about how "you don't have
to use full throttle"....yer...right...uhuh!
Saito 56 is more grunt than you'll require in the Four Star 40.
Sounds the smarter move to me. Plenty of subjects to choose from. Hog
I've just (as in two days ago) finished my 4 Star 40 and use a 52 four
stroke. I had to move the battery and rx back a fair way to balance the
model, so I think they'd be near the tail with a .70 up front. It's been too
windy to fly here, not to mention to small problem of having to work until
dark, but based on previous experience with similar size models, I don't
anticipate any shortage of power with my 52 powered version.
I flew my 4 * 40 for about 3 years with a Saito .65. I liked the
combination plenty of torque but not overpowered. I had to use 3 1/4"
wheels to get prop clearance for the 13" prop.
Awhile back I switch to a Saito .56 to be honest the plane flies
better now. It was always nose heavy with the .65
The .70 should work ok.
A friend in our local club tried to run his 4*40 with an OS 70 and
wasn't happy with the result. He felt that he didn't have sufficient
rudder area to always deal with the torque it created. In the end he
went back to a 46 2 stroke and finally a 52 4 stroke and is much happier.
John Beck wrote:
I flew my 4*40 with an OS 40FP believe it or not and it flew just great and
would still be flying just great if not for pilot stupidity. Mind you, it
didn't bore holes in the sky but it was a joy to fly, easily got off a rough
grass field and did great snaps. If I had put a 46FX in it, I'm sure it
would have kept going straight up.
I've been flying my 4 star 40 with an ASP .52 four stroke and the power
suits the model well. It isn't going to climb vertically very far, but there
is enough to get most standard aerobatics out of it, and there is a lot of
pleasure to be had from nursing a model through the manoeuvres rather than
point and squirt flying.