Kbb 34" mono build

[kfxguy]

I made the flood tube support.



And I had to lay some more carbon. What I plan on (tell me what you think) is I'm going to epoxy a plate over the whole big part of the flood tube. This plate will serve a few purposes. It will hit the flood tube, hide some wiring and cooling lines. It will also be the base for my servo, bec and receiver to mount on. Then I'll make a cover for the top of that. Yes? No?

This is 9"x 12 which will net me about 8x10 when I square it up





I also mocked up the strut and rudder to see what it will look like.

[keithbradley]

Where are the lipos going?

[kfxguy]

Where are the lipos going?

The trays will be next to the motor as low as I can get them. I'm trying to decide what epoxy I'm going to use to hold them in. In all my cats I have the trays wedged in between the tunnel and outer walls of the boat with epoxy going the whole length of them. In this it's going to have little tabs to space the trays up a tad altho I have a different idea that's harder and will take longer.

[kfxguy]

Here's the strut and rudder mocked up. I should be mounting them tomorrow night.

[Luck as a Constant]

The trays will be next to the motor as low as I can get them. I'm trying to decide what epoxy I'm going to use to hold them in. In all my cats I have the trays wedged in between the tunnel and outer walls of the boat with epoxy going the whole length of them. In this it's going to have little tabs to space the trays up a tad altho I have a different idea that's harder and will take longer.

I have a huge tube of silicone for gluing trays coming from Keith.
If you want, I can report back to you on how well it works.



Sent from my iPhone using Tapatalk

[kfxguy]

I have a huge tube of silicone for gluing trays coming from Keith.
If you want, I can report back to you on how well it works.



Sent from my iPhone using Tapatalk

Sounds good!

[Roy Van De Sande]

Roy, have you ran any other Lehner motors? 3080/9 on 12s lipo is a 25k RPM setup...not exactly playing to the strength of the 2 pole LMT design. I can see with your setup why you would prefer the 4 pole motor, but you might change your mind if you were using motors at higher RPM. I'm sure you weren't impressed by the 3080/9 on 12s, but I can say from experience that a 3080/7 on 14s is in a completely different world.

Some data from Lehner:

The power increase is proportional to the rpm. Make sure there is good cooling.
Operating voltage x 2 = rpm x 2 = double power

Max power of the series 30xx motors:
3040 50000 rpm ca. 12 kW (at ŋ / Pmax)
3060 50000 rpm ca. 17 kW (at ŋ / Pmax)
3080 50000 rpm ca. 30 kW (at ŋ / Pmax)

OP: Great looking build so far!

Hello Keith,

I have done these comparisments so far:

Lehner 1950 vs leopard 3674
Lehner 2260 vs TP4070
Lehner 2280 vs TP4070
Lehner 3040 vs TP5660
Lehner 3080 vs TP5850

So far I had these result: the lehners motors are always hotter than the TP/leopard motors after the same amount of time, at the same voltage, with the same prop.
The kv of the motors I compare are more or less the same under load to minimize the difference between the motors. The Lehners
draw statistically 10-15% more peak current, runtime drops with 10-20%. I have ran over 2000 tests with all the different motors so
the results are in my opinion real and good data. I am working with a good friend on a study about DC electric engines. We have
ran the tests in a boat but also just on a bench with equipment mounted to it to see how the different motors designs performed.

In the case of the lehner 3080/9. Yes I have tried other voltages. I have ran it up to 16s2p in my 45' mono. That is close to a 35K setup.
35K isn't a that much for a lehner but still for a lehner 3080, I think it is near the maximum to keep the current peaks down (<500A) if you
want to spin a decent prop. With a x465 octura It ran around 75mph but the runtime was limited to 2minutes and the current peaks were
around 400A. The temperature of the lehner was around 55-60°C with the standard lehner cooling jacket mounted. This would be around 140°F
to make it easy for you. MBP now sells a longer cooling jacket for lehner motors which will definitely bring the temperature down a bit. I have tested
the impact of a small/longer cooling jacket on a TP4070 in a bench test 3weeks ago. The difference between a 50mm cooling jacket and a 90mm cooling
jacket were over 30°C or 86°F. All cooling jackets were made of the same material at the university I do this study at, just shorter or longer. A stunning result. After this test I am convinced I could bring the temperature of the lehner 3080 down a bit.

Last winter I mounted my old TP5850 600kv back in the boat. I ran it last week on 14s2p with a 6717/3 prop. Speeds so far in 3 runs: 78,82 and 81mph.
The most important result for me was the runtime, 3minutes, which is a full minut longer than the lehner gave me at the same speed. Current peaks were only around 300A. The Motor
temperature was around 40°C or 104°F. This will be the result of the larger area that is watercooled in comparisment to the lehner but also the fact that the lehner
has a 2pole design (less torque) and the TP has a 6 pole design.

In my experience, lehners are just the best motors for running straight lines at high rpm and high speed. The only reason for this is their 2-pole design
and the smart design of the rotor of the lehners. For all other applications (oval racing , sport running , ... ) I believe TP/leopard/scorpion/neu are the better choice. This will be the case for just all the people who are not aiming at some speedrecord.

Furthermore, there is also the weight of the lehners. A TP5850 is almost a full kg lighter than a lehner 3080. This will have its influence on a boat
with a weight of 9-10kg like me 45' mono.

The last argument I have is the price of a Lehner. Yes it is true, lehner offers the highest quality motors on the market today. BUT, for the price
of 1 lehner you can often buy 3 - 4 TP/leopards. This means you will have to break 3-4 TP motors before you can say, yes it was worth it to buy the
more expensive lehner. I have never broken a TP motor so far and I am really pushing them the to limit. My TP5850 is rated up to 12kW, I am asking
around 15kW sometimes. I am running this setup for 1.5 year now. If the TP5850 would brake right know, that would mean the lehner 3080 I had
would be in my boat for 6 years?? In 6 years time, there will be some new motors on the market I guess, maybe better than the lehner motors right know for
a fraction of the price. Who knows?

OP: Wow man , where do you find the time to work on your boats that much? Looking great all along :)

[kfxguy]

Hello Keith,

I have done these comparisments so far:

Lehner 1950 vs leopard 3674
Lehner 2260 vs TP4070
Lehner 2280 vs TP4070
Lehner 3040 vs TP5660
Lehner 3080 vs TP5850

So far I had these result: the lehners motors are always hotter than the TP/leopard motors after the same amount of time, at the same voltage, with the same prop.
The kv of the motors I compare are more or less the same under load to minimize the difference between the motors. The Lehners
draw statistically 10-15% more peak current, runtime drops with 10-20%. I have ran over 2000 tests with all the different motors so
the results are in my opinion real and good data. I am working with a good friend on a study about DC electric engines. We have
ran the tests in a boat but also just on a bench with equipment mounted to it to see how the different motors designs performed.

In the case of the lehner 3080/9. Yes I have tried other voltages. I have ran it up to 16s2p in my 45' mono. That is close to a 35K setup.
35K isn't a that much for a lehner but still for a lehner 3080, I think it is near the maximum to keep the current peaks down (<500A) if you
want to spin a decent prop. With a x465 octura It ran around 75mph but the runtime was limited to 2minutes and the current peaks were
around 400A. The temperature of the lehner was around 55-60°C with the standard lehner cooling jacket mounted. This would be around 140°F
to make it easy for you. MBP now sells a longer cooling jacket for lehner motors which will definitely bring the temperature down a bit. I have tested
the impact of a small/longer cooling jacket on a TP4070 in a bench test 3weeks ago. The difference between a 50mm cooling jacket and a 90mm cooling
jacket were over 30°C or 86°F. All cooling jackets were made of the same material at the university I do this study at, just shorter or longer. A stunning result. After this test I am convinced I could bring the temperature of the lehner 3080 down a bit.

Last winter I mounted my old TP5850 600kv back in the boat. I ran it last week on 14s2p with a 6717/3 prop. Speeds so far in 3 runs: 78,82 and 81mph.
The most important result for me was the runtime, 3minutes, which is a full minut longer than the lehner gave me at the same speed. Current peaks were only around 300A. The Motor
temperature was around 40°C or 104°F. This will be the result of the larger area that is watercooled in comparisment to the lehner but also the fact that the lehner
has a 2pole design (less torque) and the TP has a 6 pole design.

In my experience, lehners are just the best motors for running straight lines at high rpm and high speed. The only reason for this is their 2-pole design
and the smart design of the rotor of the lehners. For all other applications (oval racing , sport running , ... ) I believe TP/leopard/scorpion/neu are the better choice. This will be the case for just all the people who are not aiming at some speedrecord.

Furthermore, there is also the weight of the lehners. A TP5850 is almost a full kg lighter than a lehner 3080. This will have its influence on a boat
with a weight of 9-10kg like me 45' mono.

The last argument I have is the price of a Lehner. Yes it is true, lehner offers the highest quality motors on the market today. BUT, for the price
of 1 lehner you can often buy 3 - 4 TP/leopards. This means you will have to break 3-4 TP motors before you can say, yes it was worth it to buy the
more expensive lehner. I have never broken a TP motor so far and I am really pushing them the to limit. My TP5850 is rated up to 12kW, I am asking
around 15kW sometimes. I am running this setup for 1.5 year now. If the TP5850 would brake right know, that would mean the lehner 3080 I had
would be in my boat for 6 years?? In 6 years time, there will be some new motors on the market I guess, maybe better than the lehner motors right know for
a fraction of the price. Who knows?

OP: Wow man , where do you find the time to work on your boats that much? Looking great all along :)

Good info. I did buy the 2250 and 2260 for straight line speed. They are for my rivercat (2250) and my shocker (2260). When i get to the point where i want to just tool around with them, then they will get neu motors. I have a 1521 for the rivercat already and it would be easy to take the 1521 out the mono to put in the shocker. Ive never had anything that runs hot because i always over do things.

[larryrose11]

Do you plan on using a STS?

[kfxguy]

Do you plan on using a STS?

Nope. It's to much trouble to fool with and I don't have water issues since I've started putting sealed roller bearings in my struts.

[kfxguy]

Didn't do anything to it tonight. I did finish the carbon sheet. I'd rather give it a couple days to fully cure before doing anything with it.



Carbon selfie? Lol you'd have to see this sheet in person, it's very nice. It measures about .080 thick.

[kfxguy]

Starting drilling holes

[kfxguy]

Made a multipurpose esc mount. In case I want to mount a different esc. Not doing anything elaborate or complicated. Maybe later. For now it will use a battery stray to hold the esc in place. Not covering anything up either. Simplicity and neatness is what I'm going after.

[kfxguy]

Got some more done.

I didn't have a linkage boot fitting long enough because the transom is very thick so I made one.








Started on the plate that holds the servo, receiver and bec.

[kfxguy]

Getting ready to mount the battery trays.