lmt 3080/8 vs 2028

[rad35]

How does a castle 2028 compare to a lmt 3080/8 motor as i am not familiar with the lmt's. I am thinking on building a large cat hpr 233 with twin's did some checking on hpr site they have had success with the lmt setup on 12-14s in this hull speeds up to 80 mph. Is there a better or more comparable motor than the 2028.

[photohoward1]

Nothing better than an LMT. Cost is obviously higher than the 2028. What does your wallet say?


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[rad35]

No doubt Lmt is probably all around better but power comparison for the price? how would they rate or no comparison?

[Fluid]

The 2028 is a very strong performer on 10S. Club members run both 3080s and 2028s on 10S in various boats and while we have never run a scientific comparison, the Castle holds its own. Longevitywise, who knows.


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[rad35]

thank you for the reply i know this is a big hull to push butt dont want to break the bank building it. just finished my vx rocket tp 4060 1050 kv 8s x450 props got one run in before ice did ok for start. the 233 is a little bigger than i was looking at building in a cat but think the price is right to start. butshure i will need all the help i can get.

[oscarel]

No comparison between the 2. 3080 is a bigger more efficient motor. A better comparison would be a 3060 vs 2028.

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[rad35]

Ahh i see what about a tp 5680 3y 1070 kv that shows 7200 cont. watts. cant seem to get spec's on 2028's every one talks they put out about 10 hp not sure if that is cont. or max.

[oscarel]

Not sure, but kvs are different. Newer 2028 are 800kv.

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[Fluid]

Oscar, in the real world the 3080 and 2028 are not that far apart, seen it too many times in the club. For SAW or zip zip running the Lehner wins, but for 90% of real-world running they are closer than the numbers say. The Kvs can't be the same, Lehners are rated under load, Castles are not. The 2028 needs a higher Kv to be comparable.


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[oscarel]

Oscar, in the real world the 3080 and 2028 are not that far apart, seen it too many times in the club. For SAW or zip zip running the Lehner wins, but for 90% of real-world running they are closer than the numbers say. The Kvs can't be the same, Lehners are rated under load, Castles are not. The 2028 needs a higher Kv to be comparable.


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Jay, I have real world experience with the motors in question. I'm currently running the 3080/8 in the sport in my avatar. It's had a 2028 and a 3060/7 in it. So we're talking bigger motor at 656kv loaded, a smaller with 800kv unloaded and 778kv loaded. I chose the 3080 because it always came back with no heat at all, was able to run the exact same size props the gas boats run, and finish a 7+ lap heat race with 7400mah of lipo capacity with 30-40% left. I've run this setup for the last 2 years and it's finished D7 first both years. There's not only a kv difference there's a weight difference as well, 14oz between the 3060/2028 (same weight) and 3080. Of the 3 that run electric sports in the district, 2 are running 3080's of different kv and one is running a 2028. Not sure if Jim was able to get his running good with the 2028 and Charles has an insane boat if he's able to get it settled down with the 3080 6 or 7 turn.

[oscarel]

Also note that the Lehners are rated with D wind using 15 degree of timing..

RPM table
Series 10xx 15xx 19xx 22xx 30xx
Specified rpms can vary due to the production process about +/- 4%
RPM/Volt at max. efficiency (under load)
rpms are determined with 15° timing

[rad35]

ok so i got this right need bigger than 2028 will do a tp 5680 options 800 kv or 1070 kv.

example: 56803y 1070kv 10s is 39,590 rpm using x465/3 prop
56804y 800kv 12s is 35,520 rpm using x465/3 prop

will the 800kv setup have more power and less amp draw or is it not much difference? enjoying the input certainly helps.

[srislash]

The 800 will totally use less amps, likely more torque and will spin that prop easier.

I should state: lower KV and higher voltage to gain the same rpm IS less amps. It can be a trade off, less Mah on board but more cells as far as weight/space goes.

[rad35]

The boat im looking at building is 22 in x 92 in space is not an issue LOL. The boat with those motors 300 amp esc's 8-6s battery's will be about 60 lbs. do you think that the motors will push that maybe like 50-60 with those props. By the way my mono worked out good using your suggestion's thank's.
May be a little crazy on this one LOL. but love a good challenge.

[srislash]

I have not run a boat that large but my pal LoneWolf is running a 185 now and he is getting familiar with props size and such on the larger vessels. I'll be conversing with him today and I'll point him this way.
But with my observations I think you should have a viable system. Likely better than 50-60mph with the right props.
This will be the decision making, starting props! They are a decent size and not cheap.