splatt

Just got to tell you folks that 46 AX is a real power house. I got one on a RacerII and it goes, goes, goes.

Easy to tune, easy to fly, sounds a bit different than our older FX, and runs like a charm.

Look out world, papa gota' new pair of shoes 8)

daven

My Feedback: (1)

I'm glad I ordered one, but I am concerned about how it will effect all of the existing .46 FX engines that already exist for our local racing class.....

We will see. If its too much, it might not pass the vote after the big race.

diggs_74

I hope it's not too much of a power house..... I have 3 FX's. Splatt, what are you running for a prop and RPM??

Lee

Mluvara

My Feedback: (10)

From what I understand, they are significantly more powerful than the FX. One of the motor gurus around here already took it apart and analyzed the timing, etc. Definitely a different beast. We're impacted with T-34 racing because FX's are no longer made and are the required motor. The decision was made to the FX this year because there still are many around and then migrate over to the AX.
Michael

splatt

Well, as far as RPM's were I saw a peak of 15,600- 15,800 on a APC 8.75x9W. I put one tank through at work during my lunch hour, then scurried out to the field after work. I put on one of those wooden blank props that Darryl sells to make Q40 props out of, I think it's a rev up 9.5x7.5 went good, Then I put that same prop on Scott H.'s Predator with a FX and it was a dog. Ran the APC after that and was a happy camper. I did take the restrictor out of the muffler before final asembly.

The big differance in the motor is that the slot for the front intake is shaped like a bowl in the crank and the passage way in the crank in .040 smaller and the front schurnule port is 25% bigger. To me the total timing appears to be the same by comparing the slots in the sleeve and the slot in the crank as compared to the throw on the crank. The piston is totally different.

I did a thread in the engine section back in December called "OS 46AX vs. 46FX with pics" , do a search for it and look at the pics

It does have a different sound to it. Our first quickie race is the 24th so we'll know more by than.

daven

My Feedback: (1)

Your RPM is similar to what I would see on my best FX engine (which seems a little stronger than most).

I hope mine gets here quick so I can get it broke in.

I'd hate to be chasing you all day

LADAWG

My Feedback: (3)

Has any notice a 4 oz difference in weight difference...I have notice no comments on that yet....this two engines perform about the same...Is the weight coming from the new muffler?...I just bought a 46ax and haven't ran it yet but I own a 46fx....it would seem os would want to make the engine lighter not heaver for improvement.

splatt

It's the muffler, it's square, but the inside is round. So all those corners are DEAD weight.

The sleeve is also longer which accounts for the weight too since it's brass. Someone who looked at the AX said "wow, looks like a super tiger sleeve" with regards to how the sleeve mates to the cylinder head.

daven

My Feedback: (1)

If its 4oz heavier, you can have it. You can chase me after the first lap after you struggle around the course

Whats our rules say about an .46AX with an FX muffler????

diggs_74

You wouldn't think they could put 4 oz in just the muffler would you.... That's a pile of weight when you talking about a total of 17oz for the FX... They must have done something with the case too.... Anyway, I have a hard enough time trying to get to 3 1/2lbs. without adding another 4 oz into the mix.

Lee
33w

diggs_74

I went up on Tower and the weight difference reported there was about .75 oz difference with the AX being heavier.

That's just what Tower says of course.

Lee
33w

splatt

Struggle my butt, your mine this year. My partner & I will be victorious over the forces of all oncomers

diggs_74

And the trash talking begins............. Funny, I thought that wouldn't start until at least part way thru the first race

Lee
33w

LADAWG

My Feedback: (3)

I just read the info on the Fx incorrect....the weight with the stock muffler comes to 16.45 oz compared to the 17.20 with the AX...but there almost a 1.0 oz difference in the the two mufflers......the out put the of the two engines comes to 1.62 for the fx and ax is 1.65 which makes me feel a little better.....I think I will take my old fx muffler and put it on the ax....ozs add up fast.

splatt

No apologies necessary, Daven and I race against each other and he has been past champion for the last few years and it time for him to go down. I'll have a tough time though, he builds straight and flies good so I need to get in his head, maybe offer him a cocktail before hand.

daven

My Feedback: (1)

Did someone say Coldies ???

Thats for after the race.

If Jesse would stop cutting #1, he'd win more races

If you look closely at the HP ratings of the two engines, they are virtually identical. If I recall the FX is 1.62 BHP, and the AX is 1.65. However, the AX is not reporting Brake Horse Power. Its some metric "almost" equivelent that converts into nearly exactly 1.62 BHP so there is no real difference in the stated HP.

daven

My Feedback: (1)

I saw Splatts AX go yesterday, and it did look quick. Could be the engine, or it could have been the plane (which looked pretty good despite the Meatballs). The only way we'll find out is if we get some readings on a specific plane with an AX on it, and then swap engines out with an FX and take more readings.

I had a nice package in the mailbox when I got home, my AX just happened to arrive. What timing, I think I will have to get a few tanks through it before Saturdays race...

If you check with Chief Aircraft, they have a great deal on these motors. $85 for the FX and $92 for the AX.

splatt

Alright class, today we learn the difference between Daven and myself.

Confusing green stripes , BAD

Easy to see bright circles, sometimes referred as "meatballs" , Gooood

daven

My Feedback: (1)

daven

My Feedback: (1)

Well, this conversation has caused me to run two tanks of breakin fuel through the engine, and at this point I am impressed also.

First tank was run with my "top secret" .46 break in prop, and the second I used the 8 3/4" x 9W just to reference against "meatballs" numbers. I was suprised that the low end needle was set nearly perfect from the factory, unlike the FX which usually tended to be quite rich.

Engine starts easy, and runs well. I still don't like the goofy remote needle, and the spaghetti lines you gotta run to make this work with a back plate, but it did run quite well.

On the second tank, I cruised at about 15,700 rpm with the 9W pinching it about every 10 seconds where it would jump to about 16,200 rpm.

In comparison, my good FX that I flew yesterday turned a 8.8x9.5 at 15,500 and would hit 16,000 on the pinch. Although the 9.5 looks great in long sweeping passes across the field, it tends to loose a bunch of speed in the turns.

It will basically come down to how much this engine unloads in the air. Ground RPM gets you in the ballpark, but doesn't really tell you a whole lot other than that. This engine may need a completely different set of props than what we are use to.

diggs_74

I wonder how many AX's I'll have to race against this year in the "novice" class?? Hopefully there aren't too many or I'll have to auction all the FX's and get a couple AX's.... Dave, does Chief Aircraft have a website??

Lee
33w

daven

My Feedback: (1)

Yes, its www.chiefaircraft.com

However, I see that they don't have the AX listed anymore. They still have the FX for $85, but I don't see the AX on there this morning.

Its kinda a tricky website thats tough to navigate so I may have missed it this time.

Most of the fliers in Standard will be using the FX, the only people I am aware of now with an AX is myself, Jesse, Elert, Pat, and Del. After the 4th race, we will have a vote on weather we will continue to allow the engine. If it gets voted down, I think we have an even bigger problem because what are we going to do when we can't get anymore FX engines??

Randy Etken

My Feedback: (10)

Why so much bench racing? It still comes down to thumbs, plane, eng, caller and a little of luck to be the winner. And don't forgett, daven and splatt, you still have to get by me and the new and improved R200!!!!!!!!!!

daven

My Feedback: (1)

Whats an R2D2 ?

LOL

Randy Etken

My Feedback: (10)

The plane in front of yours!
Ha Ha


Randy