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[Backerther]

Derek,
You hit again interesting point of sound change about which I have been annoyed to some extent....
To tell the truth, right motor is possible the key to solve these subjects/problems.
while right motor is so smooth in revolution by fingers as well as left one.
The set-up of the pump units are I'm sure well securely done and alignment between motors and impeller shafts also
seem OK.
One point I feel anxious about is the design of setting a motor to its motor mount of the pump unit which seem a bit
unstable and unbalanced for a very high speed rev. brushless.  To make the matter worse, the material of the pump is plastics which may be apt to irregularly vibrate at rather low rev. not at high rev,.
But left motor has kept on working since the set-up.

At any rate, vibration and resonance are normally clear at low rev,. and would disappear at over half throttle for my ears. (for my right ear with a hearing aid)


Another point to cause such resonance or vibration I suppose may come from difference of calibration of ESC between the two.
I am trying to adjust the right ESC properly to be arrived soon according to the instruction manuals.


At any rate I could enjoy this pla- model jet boat to make her better for a month or so to come. Wow.!

[Backerther]

By the way, I tested the jet capability of my jet pump unit actually on the lake (not on the bathtub water) to confirm how much powerful it would show me. Since I have imagined already it would surely drive me to a terrible result to get me drenched to the skin right after starting the test in the bath room. Oh,my goodness!

Attention even to the drain of the cooling water in the form of long and sometimes a bit linear flow not arch..
What should I represent this wake other than "this is really jet"!!??   
 Arno's jet of his Shannon is possibly and surely way violent than mine like rocket (not jet) like power by large brushless motors....  

[Backerther]

When I was watching the video carefully of my 109JP for analyzing her behavior on the water, I happened to come across unique
scenes that one or two waterfowls was observing my boat seriously to pass in front of them. Followed by consequent anger..?
Is it only me who to understand the waterfowl in that way.!!?
Apart from your understanding the scenes, it may be true that the scenes may reflect a good harmony between the boat(artificial) and the waterfowl (Nature), isn't it.?
In this sense, RC boating on the water may produce such "a byproduct" other than boating itself....???
And I may be so happy to be able to enjoy such a byproduct at home and Nature beside the lake ...   Wow!

[Backerther]

Hi mates,
It was a very fine day yesterday with the air temperature of 14degrees C and around 2m/s of wind speed, slightly windy and choppy on our local boating lake as in the pics below. A bit severe for a trial run for my small pla-model boat, but this is a MTB..
There was no reason why I did not go to the site for the weather conditions at all for the third trial day.
Since I just applied some countermeasures to improve my 109JP as to meet my image of sailing performance as a model MTB.

Before actual sailing of the small boat for the lake, I checked the balance as I had reset the battery location and a small ballast as well as trimtab angle to get it slightly negative side for much better planning attitude with a higher speed capability.
The choppy lake was not cooperative with the test a bit drenching all the crews to the skin.
Compare the size of wave with the boat swinging like a piece of leaf floating on the water..!!??  
Therefore, I previously inflated a rescue rubber boat for a quick response against sudden stop of 109JP due to an accident. 

[swiftdoc]

Photo no. 7 is just beautiful, Kiyo! 

[Backerther]

Thank you so much, Arno.!
Yes, that looks good to my eyes, too.