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.
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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.