Neu 1515 or 1521?? - Page 2 - RC-Monster Forums

jhautz · 10.11.2007, 08:53 PM

Good point on the 1521 fitting down on the motor plate CHC. There is more to it than just the length though...

The 1521 is almost exactly 1mm longer than a Lehner 1950. so it should fit length wise. But... the 15xx series Neu motors are bigger diameter than the Feigaos and Lehners. I think like 40mm vs 36mm on the smooth motors. The finned Neus are even bigger diameter. I have my motor set up sitting flat on the motor nitro motor plate and pushed all the way over against the side plate. Set there with a 36mm diameter Lehner I can just get a 20T pinion to fit on a 47T spur gear. If you use the bigger diameter Neu motor it wont allow you to get that big of a pinion gear on it. Some quick math estimates 17-18T pinion would be the largest that would fit a 47T spur.

Do some quick estimates with BrianG's speed calc and make sure that you will be able to get the speeds you want with the kv motor you choose on the voltage you want to run. My Savage setup is spinning the motor about 37000rpm to get the speeds I mentioned on a 20/47 gearing setup.

The smaller diameter motors might be a better choice than a Neu for mounting down inside the chassis. For sure dont get a finned Neu for this application. Just something to think about before you place an order.

Purplefade · 10.11.2007, 11:33 PM

Quote:

Originally Posted by coolhandcountry

I got a concern. Is the savage going to have the room for the 1521 neu in the spot you going to mount it.
It does have limits if you put the motor in some spots. Just like to add that. :)

chc - I too was concerned about that, I know even with my 9XL I was clear against the TVPs to get the mesh correct. I'm still actually a bit concerned with the finned Nue, but seeing so many guys running them, I'm sure I'll work something out. I'm hoping for some more info on jhautz mount, looks like he has his hung off the TVP using a "simple" L mount from say 3/16 - 1/4 inch aluminum. Also liked Serums adjustable mount alot as well, just need to shoot him a quick question on the over all setup and how it worked out. I know he posted his drawings, but I don't imagine I have the skill, nor tooling (more likely) to pull off making one of my own lol...

All that fun said, I've settled on the 1515/2.5d, I think the common theme was that the 1521 was going to be a drive train killer and I do want to have fun with it vs always have it apart for repairs

Purplefade · 11:43 PM

Quote:

Originally Posted by jhautz

Good point on the 1521 fitting down on the motor plate CHC. There is more to it than just the length though...

The 1521 is almost exactly 1mm longer than a Lehner 1950. so it should fit length wise. But... the 15xx series Neu motors are bigger diameter than the Feigaos and Lehners. I think like 40mm vs 36mm on the smooth motors. The finned Neus are even bigger diameter. I have my motor set up sitting flat on the motor nitro motor plate and pushed all the way over against the side plate. Set there with a 36mm diameter Lehner I can just get a 20T pinion to fit on a 47T spur gear. If you use the bigger diameter Neu motor it wont allow you to get that big of a pinion gear on it. Some quick math estimates 17-18T pinion would be the largest that would fit a 47T spur.

Do some quick estimates with BrianG's speed calc and make sure that you will be able to get the speeds you want with the kv motor you choose on the voltage you want to run. My Savage setup is spinning the motor about 37000rpm to get the speeds I mentioned on a 20/47 gearing setup.

The smaller diameter motors might be a better choice than a Neu for mounting down inside the chassis. For sure dont get a finned Neu for this application. Just something to think about before you place an order.

LOL, looks like I should read page 2 before responding so quickly :-) So you actually had some "difficulty" getting her tucked down in there did you. Huum, now I've got some thinking to do and will most certainly have to give a much harder look into putting something like Serums mount together. I think eliminating the motor plate all together and having the space open might be the ticket. I think my only concern at that point would be the drive shaft and possibly the brake discs... Fingers crossed using the low CG TVPs buys me the space I need to hold a finned can, thoughts on that?? - I just like the thought of the extra cooling privided by the surface area of the fins, any idea how much cooler, if any, they run vs the non-finned cans?

I'm actually going to go with the FLM low CG (standard not extended) TVPs and port all my guts over when they get here, having that extra .5 in there may push things down low enough to get it all to clear (without the motor plate). My concern at that point would be stabalizing the rear section of the TVPs between the trans and rear bulks, call me crazy but I run GH aluminum braces in mine now and it just makes me comfortable to know that I have that extra solid link back there... That said, it'll probably be OK using a nice solid motor mount and the GH bulks that I'm running now, can't imaging that losing one brace would introduce that much flex in such a short distance.

jhautz · 10.11.2007, 11:44 PM

Good chioce. Thats a great motor.

My motor mount is made up of a 3/16 aluminum plate screwed down from the bottom using the nitro mount holes and then I took 2 of the old Gmaxx motor mount plates and screwed it to the front of the 3/16 plate. I use the nitro motor mount adjustments to set the gear mesh.

You can kinda see it in this picture.

Purplefade · 10.11.2007, 11:55 PM

Ahh, OK, seeing the bigger picture, I see the bigger picture, lol. When I first looked at it, it looked like you had actually attached the mount to the TVP, I was curious how that worked out. I ended up doing the same thing, I used the FD ring mounts, they go completley around the can holding it like hose clamps (poor discription really, but you get the idea) and attach to the stock nitro motor plate using the stock holes for adjustment as well. All in all I really like them, but with the finned Nue, with any Nue for that matter, I won't be able to continue using them.

Now I have myself curious, maybe I'll look into cutting something down that would let me mount the motor to the TVP, run a simple support brace just over the spur nut and for stability and see what happens. I still like Serums two piece idea, gave him supreme adjustment with out all the headache of flipping the truck around to reach the nuts. Now I'm going to have to get creative!!

I've toyed with the idea of using Mikes motor mount for the Revo and just mounting it directly to the stock nitro motor plate but milling my own holes to allow side to side adjustment. Using low CG TVPs should give me the additional space I'd need for the larger pinions, but the thickness of Mikes mount may chew up a large portion of that as I know his mount is probably 3/16 inch thick or so itself. What to do, what to do

cart213 · 10.14.2007, 09:59 AM

I've got a Monster GT that I recently converted. I need to start a thread with some pics. It's only using a 1512 2.5D (2000kv) with 6s2p A123 and it's not overstressed. I can flip the truck on its lid if goose the throttle. And the truck weighs 14.5 pounds! So I think a 1515 would be plenty for your Savage.

Purplefade · 09:35 PM

Quote:

Originally Posted by cart213

I've got a Monster GT that I recently converted. I need to start a thread with some pics. It's only using a 1512 2.5D (2000kv) with 6s2p A123 and it's not overstressed. I can flip the truck on its lid if goose the throttle. And the truck weighs 14.5 pounds! So I think a 1515 would be plenty for your Savage.

cart213 - Dude, that's exceptional to hear, if the 1512 will motivate 14.5 pounds, the 1515 should be the grand slam for 13 pounds

Man.., I'm looking forward to getting this blasted thing together and actually running!! Three kids and a wife that just "hates" the hobby sure do cut into a guys free build time... Soon enough though, it's all good!

Thanks again for the info,
purp

Oh, checked out your post for the MGT, truck looks awesome man, keep up the good work!! I was a hardcore nitro guy for years, started dabbling in BL a few years ago then went full bore about a year ago and haven't looked back. Something about the quiet power and being able to run them right in my backyard without pissing of the neighbors keeps me hooked. - Not to mention I don't have to keep running to the LHS to pick up $25.00 gallons of fuel that I ran through in a day...

Mailman · 10.15.2007, 09:34 PM

Quote:

Originally Posted by Purplefade

Three kids and a wife that just "hates" the hobby sure do cut into a guys free build time...

That sounds exactly like my situation.

Purplefade · 10.15.2007, 09:44 PM

Quote:

Originally Posted by Mailman

That sounds exactly like my situation.

You know, it's amazing how many family guys I find that are into RC

It cracks me up when guys ("grown-up" as they'd like to think of themselves) come up to me and ask me why I still play with kids toys... Then they find out that I have nearly 3 grand in my Revo, that it goes 40+ mph and is darn near bullet proof - and we all know what happens next - they all of a sudden want to know if they can run that kids toy

"Can I drive it" is all I hear.

Actually seems like a huge number of us on here are family men, good to know that I'm not just having a mid-life crisis

I'm sure I'll be in RC until I just can't do it anymore, seems to get into the blood!

BrianG · 10.15.2007, 09:56 PM

Quote:

Originally Posted by Purplefade

...Actually seems like a huge number of us on here are family men, good to know that I'm not just having a mid-life crisis

LOL, some of us started our mid-life crisis before we could walk.

lutach · 10.15.2007, 10:28 PM

I tried my Neu 1521 1y today and was blown away. My Schulze 40.160 seems to like it as well. Go for the 1521, you will be amazed by the power this beast makes.

Purplefade · 10.15.2007, 10:40 PM

Quote:

Originally Posted by lutach

I tried my Neu 1521 1y today and was blown away. My Schulze 40.160 seems to like it as well. Go for the 1521, you will be amazed by the power this beast makes.

I REALLY considered it and REALLY wanted to go for it. My hesitation was the amount of room I have down between the TVPs.., looking at a bunch of the other Savy setups on here and having a tough enough time with the diameter of my 9XL and only being able to get it so close to the TVP for gearing options, I opted for the 1515 1700Kv motor. Seeing cart213 running his MGT with the 1512 and hearing from a number of the other guys on the forum (14.5 lbs), I've got my fingers crossed that the 1515 works out OK.

That said, if I don't get my power fix, there may be a slightly used 1515 on here for sale in a few weeks

Can't imagine that I'll need the 1521 as long as I dial things in appropriatly, but time will tell and it certainly would break my heart any to have to buy myself a 1521.

I think all in all I'm going to push the 1515 pretty hard, I'm planning on 6 or 7S2P packs (A123s), not sure which yet, may solderup a few of both and see how it goes. For gearing I'm looking at 18/47 with my two speed tranny (and actually concerned that I'm going to have to get creative with motor mounting to fit the pinion, it's already tight with my 16T...)

Purplefade · 10.15.2007, 10:46 PM

Quote:

Originally Posted by BrianG

LOL, some of us started our mid-life crisis before we could walk.

HA! Hopefully you were a late walker

lutach · 10.15.2007, 10:48 PM

I was going to get a 1515, but I like power LOL. Keep us posted on how your set up goes.

gixxer · 10.16.2007, 01:44 AM

Quote:

Originally Posted by lutach

I tried my Neu 1521 1y today and was blown away. My Schulze 40.160 seems to like it as well. Go for the 1521, you will be amazed by the power this beast makes.

what did you end up putting it in? how many cells are you running? I had that motor in my 8t running on 5s until my esc went on me. as soon as I get an esc back from mgm I plan on putting it back in.