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Outside the box thinking - 1970's Sea Commander

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Ray Wood 217/08/2020 09:19:12
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2086 forum posts
736 photos

Thanks Ashley,

I knew you would know the technical stuff, I'm basically a chancer, but I remember when we used Graupner Speed 400's for flying years ago so they must be good

Regards Ray

Charles Oates17/08/2020 10:16:01
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573 forum posts
46 photos

You also ask what can be built on to the basic Sea Commander bull. At the risk of saying the obvious, the original design is excellent, you could go back to that. Then you could make improvements, carefull use of veneers can make huge difference as can a well chosen carefully done paint job. Make it into a gentleman's cruiser.

Chas

Chris E17/08/2020 10:42:59
130 forum posts
Posted by Ray Wood 2 on 17/08/2020 09:19:12:

Thanks Ashley,

I knew you would know the technical stuff, I'm basically a chancer, but I remember when we used Graupner Speed 400's for flying years ago so they must be good

Regards Ray

 

Sorry but I don't agree. I used to fly with 400's & to get any real power we abused them horribly and they didn't last very long. I used to carry a spare motor to the flying field.

Brushless are so much easier. They have a specification that easily lets you know what you are buying, they produce much more power for a given weight of battery & motor and are much more reliable when stressed because their limits are easier to comply with and there are no brushes to cause problems.

Thank goodness that the days of different 540's, 600's etc being sold as the same, but without detailed specifications, when they are in fact wildly different can be relegated to history.

For a displacement model I might still think brushed but for a planing hull it would be brushless every time.

Edited By Chris E 1 on 17/08/2020 10:53:53

Ray Wood 217/08/2020 11:50:59
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2086 forum posts
736 photos

Hi Chris,

Yes I fly brushless & Lipos now, but back in 96 all I had was a S400 & 8 AA cells in a Model Designs FW 190 and it flew very well then moved onto the Blenheim which had 600's, those were the days

Regards Ray

Chris E17/08/2020 12:13:22
130 forum posts

Ray

.....and flights that lasted 3 or 4 minutes. I am much happier where I am now.

Chris

PS Don't you just love the sound of a twin engined model aircraft

PPS Must stop this as wandering wildly off topic.

harry smith 117/08/2020 12:57:18
1040 forum posts
1215 photos

Hi All

Totally agree with Chris E !!!

A good example is the banggood hobby surpass brushless motor, standard 540 motor mount.

Weight 132grams, 5mm shaft , a pick of three kv types.

Size 35mm diameter ,42mm long and handle 7-15volts(2-4S Lipo batteries).

The 1000kv 750Watts 55Amps.

The 1250kv 850Watts 65Amps

The 1450kv 1050Watts 76 Amps.

All Watt ratings are on 4S batteries.

I have a 30" Huntsman with a 1250kv on 3S and a good turn of speed.

Tested on 4S which turns it a bit of a speed boat!!!

 

As for brush motors the rock crawler ones are the only ones I found good specs on !!!

All on 7.2 volts(2S).

35 turn 13000 rpm, 45 turn 9500, 55 turn 7700 , 65 turn 7000 and 80 turn 5500.

The 80 turn I use in my fishing boats and handles up to a 3 blade 60mm prop.

Boat size about 860mm long( 2 Helens,1 Eileen and a French fishing boat).

Harry Smith

 

 

Edited By harry smith 1 on 17/08/2020 12:57:46

ashley needham17/08/2020 13:33:48
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6755 forum posts
198 photos

Unfortunately advice regarding which brushless motors to fit on the forum tends to 100 pages with so many options that we get information overload, which is why I went with Rays suggestion.

Already Harry has put 8 motors up for consideration, they all work, or would work for him.

Dont get me wrong, All or most of the forthcoming suggestions will be ok in one way or another but deciding can be tricky.

Chris, would you therefor like to suggest a suitable combination?

Ashley

Paul T17/08/2020 14:37:18
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7183 forum posts
1214 photos
2 articles

There is nothing like the sound of a big twin model aircraft doing a flyby, my engine of choice are old school Super Tiger 3000 as they are dependable and, with the right exhaust, sound super.

There is also nothing like the buttock clenching fear when you fly a big twin, if one of those motors die then you have massive Catherine Wheel on your hands closely followed by a big hole in the ground.

I'm always widely off topic.

Paul

Ray Wood 217/08/2020 14:49:43
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2086 forum posts
736 photos

Hi Paul,

Yes I'm with you on that !! Electric twins are just not the same no risk of one of the fires going out

I use Savox servos, I find them very good.

Regards Ray

Chris E17/08/2020 15:50:29
130 forum posts
Posted by harry smith 1 on 17/08/2020 12:57:18:

Hi All

Totally agree with Chris E !!!

...............................As for brush motors the rock crawler ones are the only ones I found good specs on !!!

All on 7.2 volts(2S).

35 turn 13000 rpm, 45 turn 9500, 55 turn 7700 , 65 turn 7000 and 80 turn 5500.

The 80 turn I use in my fishing boats and handles up to a 3 blade 60mm prop.

Boat size about 860mm long( 2 Helens,1 Eileen and a French fishing boat).

Harry Smith

Or to make them comparable with brushless (dividing rpm by 7.2v):

35 turn = 1800kv

45 turn = 1300kv

55 turn = 1070kv

80 turn = 760kv


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