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Author Topic: HMS Avenger - Type 21 - 1/72 - ballast issues  (Read 3009 times)

Rob47

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #25 on: September 27, 2023, 01:07:04 pm »

 %% %% %% %%  two Bobs on this thread, confusing {-) {-) {-) {-)


Bob
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Shipmate60

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #26 on: September 27, 2023, 09:26:10 pm »

The superstructure on a Type 21 is usually removable in 1 piece just put it on some scales.
I have had some experience of these models having sailed 7 of them without external keels.



Bob
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #27 on: September 27, 2023, 10:36:09 pm »

Gorgeous build Frogman!


In answer to the question on dimensions, the length is 5 Ĺ ft and width is 19cm.


Inside the superstructure there is a motor and board, which I donít have a clue what they are for (not the radar as that is on a separate motor) and a servo under the bridge, which again I have no idea about. These make the superstructure heavy, so I was thinking of taking them away.
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frogman3

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #28 on: September 28, 2023, 08:00:25 am »

Gorgeous build Frogman!


In answer to the question on dimensions, the length is 5 Ĺ ft and width is 19cm.


Inside the superstructure there is a motor and board, which I donít have a clue what they are for (not the radar as that is on a separate motor) and a servo under the bridge, which again I have no idea about. These make the superstructure heavy, so I was thinking of taking them away.


PITY Derek you cant put up pics why dont you log into IMGBB like me an post a linkpic as the site is free an i have over a 1000 pics on there an its easy to operate ? an regards them servo is it a full size servo ?
an the motor is that big an heavy ? but before you remove them make sure they are not essneishal to the model as you should be able to see what they do but pics if you can sir as love to help you if i can like the other guys
ATB
CHRISB

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Rob47

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #29 on: September 28, 2023, 10:15:18 am »

Gorgeous build Frogman!


In answer to the question on dimensions, the length is 5 Ĺ ft and width is 19cm.


Inside the superstructure there is a motor and board, which I donít have a clue what they are for (not the radar as that is on a separate motor) and a servo under the bridge, which again I have no idea about. These make the superstructure heavy, so I was thinking of taking them away.


Derek
Best thing for images is use the site system, easy to use and it is easier for readers as they don't have to keep opening links which is a real pain and the site is add free as well :-))


Bob

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Geoff

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #30 on: September 28, 2023, 12:37:57 pm »

I would agree about removing the motor and board and the servo from inside the superstructure as this may cure your problem.


Cheers


Geoff
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T888

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #31 on: September 28, 2023, 12:43:10 pm »

Yes removing the motor and servo will help but I donít think the weight of a servo and assuming the motor is not of a 540 size will cure your problem.




If possible if you could post pics of the superstructure so we can see what and how itís been constructed.
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #32 on: September 28, 2023, 10:22:53 pm »

I will add images of the superstructure over the weekend.[/size]Thank you
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #33 on: September 28, 2023, 10:29:19 pm »

`
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #34 on: September 28, 2023, 10:30:07 pm »

`
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #35 on: September 28, 2023, 10:32:24 pm »

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frogman3

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #36 on: September 28, 2023, 10:35:05 pm »

I will add images of the superstructure over the weekend.Thank you


HI Dereck very bueatifull model an will look real good on the wet stuff when you get her to sail ok lovely just like my amazon F169
CHRISB
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #37 on: September 30, 2023, 10:52:09 am »

Here are the shots of the superstructure
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frogman3

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #38 on: September 30, 2023, 11:11:05 am »

WOW Dereck
i can see what you mean about all that top wheight an lookin at that servo it was suppoce to work 2 knock on switches but it wont as the arm of the servo will catch on the mirco switches they should have been fitted the other way around
chrisb
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T888

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #39 on: September 30, 2023, 11:32:24 am »

Thank Derek,


As they say a picture is worth a thousand words.


I would remove the servo, motor gear box, there mounting plates and fixing and see if I would if possible lighten any of the wood parts by drilling holes.


Iíd also look at doing as Chris and have done in using ďDĒ plugs to make a breakable umbilical connection for the all the wiring in the s/s. This would allow you to have the servo, micro switchís etc placed low in the hull.
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DerekP

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #40 on: September 30, 2023, 11:50:14 am »

Is that what the plate and motor are for, a gearbox for the radar?
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Shipmate60

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #41 on: September 30, 2023, 11:59:09 am »

I would carefully remove all the topweight I could and retry her stability.
She does look exceptionally top heavy.


Bob
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tweety777

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #42 on: September 30, 2023, 10:15:24 pm »

Josse[/size]Not sure why you are telling me to replace my battery, as it had a positive affect i.e. it kept the model stable, I had NO stability issues at all with and posted the images to show aT 21 can be built without hanging keels and lumps of lead, putting lipo in would have had a massive counter affect.  The model sailed 100%Bob



Hi Bob,


Because the topic mentions stability issues and everyone is talking about ways to improve stability. Apparantly I missed the part about having replaced the battery already and that it improved the stability.


Greetings Josse
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Rob47

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #43 on: October 01, 2023, 09:21:02 am »



Hi Jose

Think you missed my point, lot of posts about hanging lumps of metal underneath, I simply poste images of MY T21 that had no stability issues at all, built with the know issues for t21 models.  Only ballast was the large 12 volt  lead acid battery  I never has stability issues.  Post was to show you can built without lumps of lead or sailing fin keels.

Bob


Hi Bob,



Because the topic mentions stability issues and everyone is talking about ways to improve stability. Apparantly I missed the part about having replaced the battery already and that it improved the stability.


Greetings Josse

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tweety777

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #44 on: October 01, 2023, 09:34:51 am »

Hi JosseThink you missed my point, lot of posts about hanging lumps of metal underneath, I simply poste images of MY T21 that had no stability issues at all, built with the know issues for t21 models.  Only ballast was the large 12 volt  lead acid battery  I never has stability issues.  Post was to show you can built without lumps of lead or sailing fin keels.Bob

Hi Bob,


I indeed missed that part, I'm sorry about that.


Greetings Josse
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frogman3

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #45 on: October 01, 2023, 02:11:37 pm »

HI Derek could you fit one pic at a time as it gets a bit tedious tryin to find the slide bar to move the pic over
cheers chris :-))
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frogman3

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #46 on: October 11, 2023, 06:27:08 pm »

an hi Derek did you get her balanced to sail ?
chrisb
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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #47 on: October 13, 2023, 01:33:32 pm »

Chris, I think yes, assuming that one of your ESC's is also your BEC for your receiver.
I am surprised that you are having this issue. Your motors should not be maxing out a 320 amp ESC. Even if you run two motors off one ESC, there should be only one ESC supplying power to the receiver. Have you tried running her with just the outside motors connected to the ESCs? Do they still reverse at high throttle? If so, then I would look to the signal from the receiver.
I have run into the issue of having a motor go into reverse when the transmitter calls for full speed. I found that by reducing the servo throw setting in the transmitter( I am using FrSky with Open TX) the problem is solved with no reduction in the maximum speed of the motor. I suspect that this occurs because the digital radios are capable of outputting a servo control signal that is of greater range than the ESCs are designed for and this causes the ESC to reverse itself.I would try reducing your signal output before you re-wire your ESCs.cheers and good luckJonathan
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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #48 on: October 13, 2023, 01:40:23 pm »

Jonathan, this is the Avenger thread - put your suggestion on the HMS Tiger one... you can probably copy and paste it?


Cheers,
Ray.

Edit: or ask Martin (Admin) to move it for you.
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Akira

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Re: HMS Avenger - Type 21 - 1/72 - ballast issues
« Reply #49 on: October 13, 2023, 01:46:16 pm »

My most humble apologies to all. My fingers had not received their morning dose of coffee. I have posted in Chris's thread.Cheersto allJonathan {:-{
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