I have an OS.91 2s in a superHots that is getting worn out, plus I am having spacing and weight problems. In a nut shell, I want an engine that does not have a remote needle and runs good on 15% fuel.

We have limited fuel sources and I don't want to have to keep more than one kind of fuel. So to the best I can figure this leaves out MVVS and Irvin which are both meant to run on low nitro fuel.

I had great hopes for the Irvin .72 until I found out about the fuel. I would really like something in the 70's. size range. anybody got a motor to suggest I can look into. How about a Tower Hobbies .75 with a aftermarket carburator?

Also if anyone has had both, I'd like a power/performance comparison between the 2s OS91 and the 4s Saito 100. thanks.

I'm also looking for a .70 size engine and was considering the Tower .75 after the Tower .60 getting a good review recently.

Is there something bad about the stock carb on the >75??

Bill

....the T.H. .75 is a really good motor, especially the
price and warrantee. There is nothing wrong with the stock carb....in fact they are excellant. The guys that had trouble
with them not shutting down....didn't have the carb down
tight on the flange o-ring.

Dave.

I have a Tower .75 and it's probably one of the best 2 strokes I have ever owned. This thing will idle like a 4 stroke forever, and starts on the second flip everytime. More power than I have seen in some .90 two strokes.

the saito 100 puts out about 400-500 more rpm with an apc 15/6 than an os 91 4-stroke. it weighs 2 oz less and will run great with 15%nitro 18% oil. don't know how it compares to the os 91 2-stroke though

Thanks Flyboy Dave and Shok for the info on the Tower .75. I have a Balsa USA Enforcer kit to start and was thinking ahead a little. What do you think about a 11x7 APC pusher on a Tower .75 ??? MAN said that the Tower .61 turned an APC 11x7 at 14150; probably a little too small for the .75. Next choice would be a 11x8 Zinger Pusher. Then the 12x6 Zinger Pusher.

Thanks,

Bill

I'd go for the 11-8 Zinger pusher....the Towers like to
turn....I run an 11-7 1/2 MAS on mine at 14K static.

Thanks again! Gonna try it.

Bill

....you can take the cap off the side of the carb, and put
the guts from the remote needle valve in it, and have a
regular front needle carb. I don't use the remote needle
carbs.

You know....I got my Tower .75 on a Friday....mounted it
and ran it acouple times on Sat.,...flew the plane on Sun.,
and ordered another motor on Mon. I really like 'em....the
best hundred dollar motor in r/c....

Take the muffler apart, and lock-tite it real good before
you run it. They come loose....and after they get all oiled up....they don't hold lock-tite as well. Make sure the carb
is down tight on the o-ring.

I use a Fox Miracle plug in mine....it has been in there for
two years....won't burn out....15% Powermaster fuel.
Mine took a while to break-in....I found out not to baby
it too much....let it run....

Dave.

I run my TH .75 with a 12x7 prop and really like that combo.

I've been wanting to try an 11-8 MAS on the F-20 for
some more speed....

Hey Dave,

Are you flying in Iraq? :-)

ZB

Thanks Dave for more good info. I've seen some other posts about the muffler coming loose, and the air leaks. I'll take your advice. I like the rear needle but if it gives me trouble, I'll try moving it also.

Your F-20 looks great (which manufacturer?). I've seen some of your other posts... Didn't (don't) you have the Cermark F-16 with an OS 1.08? I have one with an OS FX .61 on. I tried the Jett .90 and between it being so unbelievably noisy and drank the F-16's small fuel tank dry in less than 3 minutes I got rid of the Jett. The Tower .75 would probably be a good choice (for me) in the F-16.

You seem to like MAS props. I am under the impression (some knowledgeable post or article) that the APC type prop gives the most speed (RPM) and thrust for a given size prop on a given engine. What are your thoughts? I want the enforcer to be capable of high speed but still want adequate thrust if I get into trouble. I don't have too much choice with it being a pusher.

Shok, I think the 12x7 would be good for me to start with but I don't know of a 12x7 pusher.

Bill

Nope..... ....kinda looks like it, huh....? My runway
is only 1/2 mile wide....and 6 miles long....I hear the
ones in the Middle East are larger....

Bill....the F-20 is the Cermark .60 size....they were
discontinued, but it looks like Kange has them listed,
although I'm not sure if they are in stock. Yes, I have the
Cermark F-16 with an OS 1.08 in it....I'm working on it.

Yes, I like the conventional props....namely the MAS and
the Zingers....I have yet to experience any gain in RPM,
thrust, speed, or "efficiency" with the APC types, and I
have tried them......zip....zero....zilch....

Nice looking F-16, Bill....

Dave.