Novak 4.5 or MM & Fiegao 8XL in G3R w/ (2) 2s2p for 4s

[Gee]

I'm building an E-Revo on the G3R chassis with a single speed E-Maxx tranny. I currently have Maxamps (2) 2s2p 6000's and TrueRc's (2) 2s2p 6400's. So I could connect 2 of then in (series?) for 16.8v which I think is below the newer mm voltage limit. I read somewhere it was around 18v.

I have a Novak HV4.5 setup on my ext flm e-maxx now and like how easy it is to put in. Runs great when it is geared correctly. I have the MM7700's in my Rustly and Pede. So that is my experince with brushless.

I have another HV 4.5 (soon as the ESC is returned by Novak) that I was going to use in the G3R. I also have an extra MM ESC (soon as it returned from CC) and thought about getting an Fiegao 7xl or 8xl.

I know there are better setups (MGM, Neu, etc) but this is what I am working with. What would be the pros or cons of these two setups in the G3R with 4s4p lipos? Which one would you go with and why?

Thanks everyone!

[suicideneil]

2s lipo is 7.4v, so 4s is 14.8, not 16.8v (you're thinking of 7 cell nimh packs).
Anyway, if the 4.5 runs fine once its back with you, then I see no real point in spending yet more money on a new motor, esc & ubec really- like you said, you just have to gear the hv4.5 abit more carefully, and it really does run great on 4s, a very fast and quite powerful setup. The 8xl would be even more powerful, but then again it would also be quite hot after a good run- depends on how much torque you really want, since the hv4.5 will propel that Revo to 40mph with no real trouble, especially when its fed good lipos like yours. Thats my opinion anyway.

[Gee]

Yeah your right, it is 7.4v. I was using what a maxx charge limit goes to. I think all lipos are rated at 4.2v maxx per cell. My 2s2p's come off the charger at 8.32v the way I have it set. So I was using what the Maxx could be for the Lipo setup.
Thanks for the kick in the rear Neil. Don't know what I was thinking. I got other parts I need to get with that money and the 4.5 does work well. I don't want to mess with setting all that up right now either. Just drop the HV in and off it goes. Back on track now.....

[steve050773]

Gee - I'm in the same boat ..I have a 4.5 that I put in a converted lst2 to test the conversion (on 4s4p) and it worked so well that I never pulled it out. Spending my money on other things now!

[suicideneil]

Its what I do best....

Sometimes its better to spend a bit extra to get a really good system, I must admit, but if you already a working one (sort-of, lol), then run with that- future upgrades are always possible, and there are bound to be alot of brilliant new BL systems & escs appearing in the next 12 months.

[Gee]

Yeah Steve I'm glad I got the wake up call before clicked the BUY NOW button. I got the 4.5 in my e-maxx and runs great.

Originally Posted by suicideneil

Its what I do best....

Sometimes its better to spend a bit extra to get a really good system, I must admit, but if you already a working one (sort-of, lol), then run with that- future upgrades are always possible, and there are bound to be alot of brilliant new BL systems & escs appearing in the next 12 months.

And you make another good point. The brushless system are getting better and hopefully cheaper down the road.

I must of had e-bay fever after buying all the parts. Couldn't stop buying. I think I got everything I need except for wing mount, wing, and body.

It between the desert rat and this one from JD Concepts "Tango" what do you think?


Do Revo bodies come with a hole already cut out of the engine?

[NovakTwo]

Novak will be releasing info on a new 5mm shaft rotor/upgrade kit for the Novak HV motors in the next few weeks.

The beefier shaft should be a big improvement for these motors---especially for use in the new, soon-to-be-released E-MAXXes.

It's coming soon!

[BrianG]

Originally Posted by Gee

Yeah your right, it is 7.4v. I was using what a maxx charge limit goes to. I think all lipos are rated at 4.2v maxx per cell. My 2s2p's come off the charger at 8.32v the way I have it set. So I was using what the Maxx could be for the Lipo setup. .....

You are correct, but don't forget that lipos don't stay at 4.2v very long at all once you start running. It's best to use the nominal voltage value when calculating anything since that will represent the voltage the pack is at for the majority of the time. Just like you wouldn't use the off-the-charger voltage of about 1.4v/cell for NiMHs...

Originally Posted by NovakTwo

Novak will be releasing info on a new 5mm shaft rotor/upgrade kit for the Novak HV motors in the next few weeks.

The beefier shaft should be a big improvement for these motors---especially for use in the new, soon-to-be-released E-MAXXes.

It's coming soon!

Sorry! Off topic
Should I cancel my order for the nickel plated rotor for my HV-maxx 4400 and just wait for this new 5mm upgrade?

Thanks!

[Gee]

Originally Posted by BrianG

You are correct, but don't forget that lipos don't stay at 4.2v very long at all once you start running. It's best to use the nominal voltage value when calculating anything since that will represent the voltage the pack is at for the majority of the time. Just like you wouldn't use the off-the-charger voltage of about 1.4v/cell for NiMHs...

I didn't know that, but won't forget it now. Thanks Brian for sharing it. Anytime you want to pass some of your knowledge and experience this way. I'll take it.

What will the larger shaft/rotor do for the Novak setup?

[NovakTwo]

Originally Posted by cemetery gates

Sorry! Off topic
Should I cancel my order for the nickel plated rotor for my HV-maxx 4400 and just wait for this new 5mm upgrade?

Thanks!

I can't promise a firm ship date just yet, but if you can wait, the new rotor would probably be a better upgrade for your motor.

[BrianG]

Originally Posted by Gee

I didn't know that, but won't forget it now. Thanks Brian for sharing it. Anytime you want to pass some of your knowledge and experience this way. I'll take it.

What will the larger shaft/rotor do for the Novak setup?

No problem.

A larger shaft will be harder to break. Depending on how you drive and the amount of chassis/motor mount flexing, you can get some pretty decent lateral forces on the pinion, which could snap if using an 1/8" shaft.

A larger rotor allows for larger/stronger magnets. But, if I read NovakTwo's post correctly, the rotor won't get bigger, just the shaft.

[NovakTwo]

Originally Posted by BrianG

No problem.

A larger shaft will be harder to break. Depending on how you drive and the amount of chassis/motor mount flexing, you can get some pretty decent lateral forces on the pinion, which could snap if using an 1/8" shaft.

A larger rotor allows for larger/stronger magnets. But, if I read NovakTwo's post correctly, the rotor won't get bigger, just the shaft.

We're developing this rotor in conjunction with Bob's new 8th scale conversion kits. He's done most of the testing with the existing rotor, but he's not as hard on the equipment as some customers.

I'l check with the design team about the rotor size and also the material used. I'm assuming that the new rotors will be made from the higher temp material we use in the new tuning rotors.

[suicideneil]

Interesting. Stupid question, but any chance of finding out how much extra torque this new material will produce, compared to the older design rotor? Im still gonna hold out for the new BL system due next summer-ish though....

[NovakTwo]

Originally Posted by suicideneil

Interesting. Stupid question, but any chance of finding out how much extra torque this new material will produce, compared to the older design rotor? Im still gonna hold out for the new BL system due next summer-ish though....

I just checked and found out that the new rotors will be made of the same materials as the current rotor and will be the same diameter---the only rotor difference will be the shaft.