Jacked69

I was going to get a pulse 40 also and was wondering what engine I should go with, a OS 56 4 stroke or a OS 46 AX 2 stroke? Some questions?

1. What motor will give it a higher top speed?
2. Is there anyway I can fit a larger 2 stroke in there, like a .65
3. What will give it better performance overall?

Thanks alot, also it recomends 5 servos, any suggestions at what ones I should use?

Thanks for your help fellas. Jason

RCVFR

My Feedback: (7)

1. 46 2 stroke
2. Its a nice plane, don't screw it up. If you like the .65, get the .60 size Pulse
3. 46 2 stroke.

Standard servos are fine. Its aerodynamically clean design and light weight goes surprisingly fast, even with a 12X4 prop.
Its a sport/performance plane. Avoid the temptation to make it heavier.

Jacked69

Will a pulse 40 with a .46 have a faster top speed than a pulse 60 with a saito .91 4 stroke?

Alex7403

you can put there OS 55 AX, it has the same bolt pattern as 46 AX, one guy i know use this its a blast.

w8ye

My Feedback: (16)

The pulse uses standard servos - nothing special

It is a fine Sport plane. It is not a speed plane or 3D plane

Engines in the 46 - 55 size are most suited for this plane or the saito 56/62

Edited to add the Saito 56/62

ChuckW

Either engine will fly it fine but out of the two, I'd go for the .46-AX. It is a lot of bang for the buck in a 40 size sport plane. Another option is the .55-AX. I do like 4-strokes of course and if I were to put one in a Pulse I'd be looking at a .70 (OS, Magnum, Saito .72, Thunder Tiger .75, etc.) or something like an OS .81 or Saito .82.

A .46-AX with he right prop will haul a**.

No need to. Just added weight that you'll have to compensate for.

That depends how you are gauging performance. Both engines will bring something different to the table.

This is all just my opinion of course. There are numerous ways to do things.

opjose

Just to be clear, the Pulse XT is - NOT - your first plane, right????

Muroc1

Concur on the 46. As mentioned, it's not a 3D plane or a speedster. It's a fun to fly everyday plane that flies great on a 46.

Frank

Jacked69

Thanks for the input fellas, no this is not my first plane, I have a 60 pulse with a saito golden knight 100 but wanted to get a 40 to use until my fiancee progresses from her trainer. I may go with the .55ax that thing will haul, as its 3 lbs lighter than the xt 60.

beachbrada

My Feedback: (17)

I think the 46 AX will be more than enough for the Pulse, I had it in my Four Star and they are very similar planes. My Four Star hauled A** with a 11x6.

dmurf

I have a Pulse XT 40 with a OS 55 AX in it. It works very well

ser00

Hi Jacked,

I would go with the 55AX as it will give you more options for use in other planes in the future. I have a 46AX, 55AX and 75AX and the 46AX is unique in its power handling. The 46ax isn't happy unless it is turning 13000-14000 rmps so it would be great for a fast plane. As people have said before, the Pulse 40 is not a speed demon. It is an excellant 2nd plane as well as a 1st low-winger. It has no bad habits. The 55AX is just fine and dandy turning around 11,000 rpms. The 55ax seems to be more of a stump puller than the 46ax. I have used both the 46ax and 55 in a 7.5 lb P51 Mustang and the plane handled differently with each engine. The 46ax with an APC 11x7 had good speed but vertical and reserve power was a little lacking. The 55ax swinging a APC 12x6 and 13x5 had less speed but the plane has awesome vertical performance and plenty of power to get out of trouble. I put an 11x7 and 11x8 on the 55ax and was not really impressed with its performance. I know that it seems that I am stating the obvious in my statements above and I am sure that other people have differing experiences. It also depends on how you run your engines. I tend to run my engines 600-800 rpms below peak. My 55ax has over 120 flights on it and you would not believe the compression on it. People think that it is still a new engine. Your mileage may differ.
Happy flying and soft landings!

Jacked69

Thank you Serr, now I was wondering is the 55ax the largest I can go or can I go to a 75ax? If so how would the plane handle the power, again like I said in a previous post, you dont have to use the power but its nice to know its there incase you need it.

ChuckW

.75-AX is way too much for a Pulse-40. It doesn't need the power plus you'll run into physical size and weight issues.

ser00

Hi Jacked,

I completely agree with ChuckW. The 75Ax is way too much engine for many reasons. Remember that this plane is an ARF and there is a lot less wood in its construction than you see from outward appearance. It is a tough little plane. I was coming out of a loop and accelerating in the bottom half of the loop and I planned on taking the plane within two feet of the ground and then pull straight up and spiral on the way up. Lets just say that I went 2.1 feet too low. The plane did an amazing landing at 80 miles an hour. You couldn't even see the gear come off. It slid for 20 feet along the concrete. Yet, the plane faired quite well (just shaved the bottom of the plane off. One issue that I say is a problem with the Pulse XT is that the horizontal stab is flimsy (has a little too much twist in it) and the area directly in front of the tail feathers seems to be the weakest area of the plane (the wing cradle is the second area). The power and torque of the 75AX I think would be too much for these areas and they would fail, causing you to lose the plane and the 75ax. I understand that everybody says that you can always pull back on the throttle. How many of us actually do that all the time. It is like learning to drive a car. In the beginning, you are real careful, you dont speed, pay attention to all traffic laws, obey all signs and lights, wear a seatbelt, etc. Then, how do we drive after a few years? Believe me, if I had a 75AX crammed on the front of the pulse, I wouldn't use the runway for takeoff. I would just build a stand that points the plane straight up and hit full throttle and go vertical. Also, you wouldn't be able to prop the 75 either. The pulse is pretty low to the ground (landing gear.) The largest 2 blade you could get away with might be a 12" with out having a prop strike (and the gear do flatten out over time). You will be happy with the 55ax. To best answer your question, more speed - go with the 46ax - more power and vertical - go with the 55AX.

Happy flying and soft landings!

RCVFR

My Feedback: (7)

Shoot, why wimp out with a .75 when with the same weight , you can go for a .90. That way, you can make an impressive crater instead of merely etching terra firma when you put it in. Just think of the unlimited vertical, pulling out of a hover, all that cool stuff. A 1.08 would be even moreso, but if you go that heavy, heck, why not go for 1.20. That ought to be impressive.

rambler53

My Feedback: (494)

Instead of joking...
What you're trying to do is gain performance, and displacement isn't the primary factor in achieving better performance, to a point yes, but other factors will change your mind once you try going down that road. How about kicking the OS habit?
Did you know a Nelson 40 turns 24,000 rpm with a 8" prop? Nothing I'm aware of beats that motor, but you cannot idle it very well, so you give up something there. There is MVVS, Webra, but parts are hard to come by here in USA. Rossi is a great consideration, a .45 with a 9X6 prop will give you 16,500 rpm on the ground, and you can reach the limit of the wing design of that plane in no time, and you didn't even change displacement. I like Dub Jett engines. These tune well, have excellent support and warranty coverage, even for abuse. These run about 20,000 rpm on a pylon APC prop in the 8" range, and weigh less than any OS FX/AX .46/.55.

Don't think displacement. Think prop, fuel, glow plug, muffler, and what kind of drag your plane has. Match the plane to your engine.
Taking a sport plane and making it a racer isn't really the way to go. Try another forum than the beginners section. Read the pattern and speed forums here on RCU. There is where you'll learn what to do, and what you'll be flying after you get the Minnow in the air!

rambler53

My Feedback: (494)

http://www.youtube.com/watch?v=8cPau1XGpT0

Fast? Eh, sport speed.

http://www.youtube.com/watch?v=-tZa-...eature=related

12400 rpm fast? No way.

This is fast! Camera guy has his work cut out for him.

http://www.youtube.com/watch?v=7q2hP...eature=related

rambler53

My Feedback: (494)

Here ya go, OS AX .55 lovers will enjoy seeing the 10X10 on a Viper Q500 plane, it's moving well. Too bad everyone doesn't carry a radar gun in their flight box, I'd like to compare the numbers.

http://www.youtube.com/watch?v=zdf1E...eature=related

rambler53

My Feedback: (494)

It's done, Super Tigre .75 - GP Cosmic Wind Minnow.
I hope Greyhound put on snow tires for ya!
Just a bit prettier than a No Pulse 40.
I hope the neighbors aren't too hung over, I'm going
out to run it in the driveway.

Jacked69

Thanks nitro for the nice work on my baby, cant wait to get it in my hands. I hope my neighbors are asleep when i fire her up at 2am