Dear John R
I thing that Scott mentioned the efficiency of the Torquedo electric motors .The efficiency has the same bad figures on all systems ( outboard, saildrive, inboard…). The inboards are sold without shaft, bearing, prop… So, I would suppose that the efficiency mentioned is not about the system, but it is the motor efficiency. This number is not depending of the transmission. It is not mentioned Output HP, Shaft HP, Prop HP
Without a proper motor specification sheet, table and curves in relation with HP, torque, rpm, volt, amp, temp,.., all writing is poetry.. As previously wrote, Torquedo does not want to specify those details.
The only measure to compare realistically and simply two different system is the pull ( in KG or pounds) from the same boat on a rope attached to a scale!!
To comment your sequence numbers, If a motor has a 90% efficiency compared to a motor with a 45% efficiency, I will assume that I double the range with the same system! Do I?
Rgds
On Sunday, July 14, 2019, 11:08:48 AM GMT+12, 66b6dcd5b59507e7d751ea81382ea1f6 <no_reply@yahoogroups.com> wrote:
Hi,
The efficiency is not bad. In fact it is good. Read this to understand:
There will be few people on this list that are getting much over a 50% serial efficiency from battery to thrust.
John
__._,_.___
Posted by: Berlouin Fred <berlouin@yahoo.com>
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a New Topic | • | Messages in this topic (17) |
SPONSORED LINKS
.
__,_._,___
No comments:
Post a Comment