bassman2914

Ok, I'm confused. I have the volcan 60A esc/bec and it says the bec has a switch mode-i assume that's for going up to 6.0v but I don't know how to do that. Is there a jumper that you put on it somewhere or am I misinterpretting it. I'd like to give my servo's that extra kick. P.S. I maidened this plane today. Did nothing fancy but I can feel the potential.

bassman2914

I figured it out myself. Just some more efficient mode. Guess I'll buy a separate bec. Hey, $5 and my plane is that much safer, to itself and it's surroundings and I can get the 6v and give my servos the extra kick.

bassman2914

Ok, soo, i don't trust my servos on that plane even though they are just as strong as the hg-65's. The thing is mine only get ~30 degrees motion in either direction like most servos but this makes them easier to move especially since i had to put a 1" servo on every servo. I found some servos that are 15.8grams, and have 4.6kg-cm, the problem is they are only .16 sec, which is a bit slower, even though the increased torque will mean the don't slow as much pushing the surface while the hg-65's will get slower under force. Also, not all the gears are metal but from what i see from the pic all are metal put the second gear, but i can't see all the smaller gears. Is any of this a problem? These would be very reliable because of the strength. Or should i even bother with this because my servos are just as strong as the recommended?

cpreinfalk

One thing about torque and speed of the servo you have to consider is that a lot of servos with higher torque have lower speed and a lot of servos with high speed have low torque. They do that with the gearing. If you look at a list of servos of the same manufacturer where you see the torque, speed and the price of the servo, you will notice that you will see that a lot of servos with the same price are either fast or strong, but not both. If you want them to be fast and strong, you'll pay more.

If you have a strong and slow servo and put a longer servo arm on it to compensate for the lack of speed, you will essentially have the same effect as putting in a fast servo with less torque.

I know I'm stating the obvious, but I know that somebody had to point that out to me, because I used to look at the torque only and didn't look at the speed.

bassman2914

should i buy those upgrade servos? .16 seconds isn't amazing but still fast especially if it keeps its speed better because of the higher torque. I was thinking of the 4.6 kg-cm .16 sec on elevator and 3.9kg-cm(36oz-in) these aren't the same which makes me sceptical and these are .13sec so a little faster and cheaper. sound like a good combo while leaving the ail servos the same?

cpreinfalk

I'm assuming that's on 4.8V? If so then they seem good to me. The HS-65 servos are a tiny bit faster but they're considerably less strong. So if you went a tiny bit longer on the servo arms, you'll have the same speed but you will still have more power.

So I'd say yes, those should be fine.

bassman2914

No actually that's on 6v butt concidering your hands are not that fast the servos won't be much behind concidering they don't actually go 60 degrees as fast as they say and under load the hg's will go slower than these and 40% slower when you are already talking about a fraction of a second is miniscule.

cpreinfalk

At 6V the HG65 are about .11 seconds.

But anyway, it depends how you fly. If you do sport flying then it doesn't matter how fast they are. But if you do 3D (especially hovers) then you do feel the difference.

bassman2914

I opened realflight and pulled out a yak and modified the servos to .3 sec which is conciderably slower. Even at this you could still do everything, only things like the wall and sudden things were affected. Hovering was actually easier because it's like exponential having it slightly slower. that's 3 times slower while i have servos 45% slower. i tried these two speeds and there is no noticable difference. It might make really stressful things happen better becuase the HS's may stall sometimes and not get their full motion while theses...there's no chance. I'm still fine with that .05 sec delay. If I'm not mistaken, the Hs's can go 180 degrees which means to go from one extreme to the other it'll take .33 sec and the last 30 degrees on either side are going to give barley any movement whatsoever and mine going 45 degrees will only take .24 sec making it faster concidering i can still put a larger servo arm on.

daveopam

My Feedback: (9)

I know it's been a long time...but the weather finally let me put two flights on the Extra today. This is a nice airframe. Two clicks of elev and it tracked straight. I have the SFG's in place and the knife edge is nice. There is almost zero coupling in KE flight. There was some question about running the 3S packs in this plane.(which is what I have) It flys fine on the 3S. Could it use more power? YES! It's not a dog but it is less than what I am used to. I tried two different props. One was a 7" pitch the other 8.5". Both would hover it. The 7" would do it about 65% throttle. It is a better 3D prop but the speed was a litlle slower than the high pitch prop. The 8.5" pitch prop took about 75% throttle to hover. The KE was better though and square loops were cleaner. Both due to the higher air speed.
The CG is right on with the battery75% in the cowl. Inverted flight was only a slight drop hands off.
All in all a great plane. Just be sure and use 4S packs if possible.

David

JWilliams

My Feedback: (6)

I only run 4S and that has awesome power on the EFRC power setup.
Jeff

daveopam

My Feedback: (9)

I hope to get some 4S packs soon Jeff. I just had all the stuff already for this plane with 3S packs. This is my only electric and I am to tight not to use the 3S packs for a while.

David

JWilliams

My Feedback: (6)

daveopam, gotcha. I tried 3S also, but I had already been spoiled by the 4S. I run an APC 12 X 6 with 4S, cannot remember which prop for 3S but there is one that does well. Was thinking 13 X 6??? Hopefully you will attain 4S soon.
Jeff

exeter_acres

My Feedback: (2)

You can use a 14x7 with 3S, However, the packs should be At Least 2500mAh or bigger to be able to handle the amp draw....

if using the Good "Ole 3s 2100mAh packs... then you are actually being quite hard on the packs....

chewy

I have a 49" Katana that I need to buy a motor for. I have been looking at the scorpion 3020-1110kv and the scorpion 3020-890kv. Which motor would you recommend for this plane? I want 3d power and the possibility to run 3s as well as 4s. What size esc am I looking at? I would prefer to be able to use a 45 amp esc, if possible. I know on 3s I won't have the power of 4s but I already have a 3s duralite although it's only a 1250 mah. Sorry for the highjack.

daveopam

My Feedback: (9)

Thanks for the tips guys. These packs are 2170 FlightPowers. I think you are right about being hard on the packs. I am getting about 5-6 minutes out of them. I really thought I would get a little more. I may try and step down on the prop size a little.

Thanks again, david

DenverJayhawk

how does this model compare to a PA Katana MD 46"? The katana uses a 3s pack, but is lighter, so I'm guessing performance is similar?

jjone174

David,

Did you ever find a prop that works well with the 3s packs? I am in the same boat you are in. Also, how does it fly on the 3s packs? 3D?

daveopam

My Feedback: (9)

Not really. It's just lacks horse power. I tried a 13x6.5 on Sunday. The initial burst is great, but it just flys it to slow. I wound up flying it almost full power the whole time. I also have a 14x7 and 14x7.5. The 14x7.5 seems like the best of the bunch. All of these props will hover it and all will fly it around. It just lacks the power I am accustomed to. If you want to do rolling harriers and knife edges it will do all of that. It's just that it's a sow crawl from a hover and waterfalls and pinwheels are weak.
Since I have these good 3C batteries, I am going to buy 2 regulators and use them in a couple 1/4 scale glow powered planes I already have. Both could use new packs and then I can justify buing the 4S this plane needs without wasting the 3S packs.

david

Eplane65

My Feedback: (16)

I find that many airplanes of this type are rather delicate and can't tolerate any roughness on landings, etc. The landing gear mounts seem to be the most likely thing to break. Anyone have that experience with this one?

daveopam

My Feedback: (9)

I have not had that problem with this one. The EF Yak I have has strong gear mounts but the gear itself is weak. Better than breaking the mount I guess.

David

MAWRC 1

- Seeking Battery Advice -

My 300 EXP is on its way to me and I am placing orders for the remaining items to complete the plane.

I am using the EFRC recommended power package (Torque 2814/820, free upgrade to 60A Airboss ESC) as well as HS-5065MG servos all around.

EFRC highly recommends the Flightpower EON lite 4S 2550 battery but I have yet to find that version anywhere. I see 2500 packs in the $75 price range. But...

I don't want to spend that for one pack. EFRC also recommends Rhino and Zippy as low-cost alternatives - I'm looking at those and they appear to be decent alternatives.

Since I have no experience with them, what do you all think? Reliable? Long-lasting?

What about Turnigy - any good? Any other brands taht I should conider?

Also, what C raating should I look for? I was thinking 25C but maybe 20C is all that is needed. Anyone know?

I'm planning to buy at least 3 packs so I figured I should do my research before purchasing them.

Thanks for your time and consideration!

John

ps - Any recommendations on who has the best deals and stock levels?

Doc Austin

Well, here's everything I know about the Extra EXP.....

MAWRC 1

Thanks Doc,

I had already come across your article but went ahead and re-read it again.

Didn't see it until after I had ordered four Rhino 4S2350 20C packs from Hobby King. :-)

Regards,

John

Doc Austin

It ought to be just fine on 4s. I have switched most of my planes over to 3s power, and 30C is just right. If you're going to run 3s, you really need 30C, IMHO. With 4s it doesn't mater so much because even 20C at that voltage will give you more power than you can use.

However, for the MXS I like 4s power, simply because I want the plane to be baaaaaad. Generally I like my planes to be gentle and balanced to the power system, but the MXS is a monster and should be flown as such. I've been flying it on 3s and it was great, but on 4s it is fast and groovy, and the extra power helps it tumble much better. Either way is awesome, butI thinik 4s works best.