My 750 build

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Best wishes and happy sailing, Bryn Heveldt.

My 750 build

Joined: 27 May 2014, 05:58

09 Aug 2014, 04:12 #1

Hi
Show and tell for my build

Most as per the book is how the build went, only two small deviations.
1; using a sail winch as there where about the same cost as a better servo....see how this works out?

2; making the fin with aluminum balsa and glass..no just aluminum, come up looking good.

When I CAD the bulb for the keel it weight was light as to what the book said so I add a little to the circumference and made a aluminum mould. The weight was 50gr under the weight but by the time the glueing was done it will be spot on.


Just the sails to go now
Has been great fun building the boat a little more and and it will be sailing.... :D
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Joined: 27 May 2014, 05:58

11 Sep 2014, 04:16 #2

Update

Made some test sails as suggested by matt07 from florist cellophane (30 micron) which explains the black colour and gaffa tape.
Learnt a lot doing this for sailmaking and how the rig worked.
First problem was in the backyard the wind was swirling around from every direction, then got the idea of a wind tunnel when I open the front door :idea: , hence boat testing move inside. 006.JPG First problem was the winch tangled..beginners lack of knowledge. 017.JPG The boatwright Mr google told me a continuous line was needed, below is the winch end with the line coming through the deck inside some copper tubes 020.JPG The other end is the plastic pulley that I made which runs on a brass shaft 024.JPG All work ok now...
Just got to tidy up some loose ends
Now to make some good sails
Going to tring for the maiden voyage this weekend.....

Russell
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Joined: 27 May 2014, 05:58

14 Sep 2014, 13:52 #3

Down to the lake I went, then stood there think the wind a bit strong for a first sail 8 12 knot gusting 20.
Bugger it I can only brake it.... so in it went......This being my first time with a rc boat.. :shock:
Hauled the sails in... the bow come off the wind.... straighten the rudder.... and it took OFF like a rocket on rails. I was just going wow wow wow to myself...Now the boat getting very small so the first tack is required...over with the helm around comes the bow one flap of the sails and off again.. just brilliant.
Next the down wind and do I own a sailing submarine?.....Turn the bow off the wind let out the sail all the way...a few rudder correction now every thing is backward as it head towards me.. :? Main out one side jib out the other... it is now surfing the waves..... and for the next two hours this is how it was...

WOW, brilliant, just so much fun . :D :D :D :D :D

Once I trimmed the rudder on the radio it would sail straight with no hands (or thumbs) Maybe just the odd touch
It really power on a reach and I got it to submerge once on a downwind leg, but I think this was mainly due to coming over a large wave, but it pop back up quickly. I put this down to ready this forum and putting the bulb as far back as I could and making it up to the full weight
009.JPG 034.JPG 036.JPG 039.JPG 041.JPG
Rescue boat I made just incase.... :roll: :roll:
052.JPG
Rescue boat
What a great day!
Russell
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Joined: 27 May 2014, 05:58

17 Sep 2014, 01:11 #4

A near disaster..... notice this after I got back from the last outing...
001.JPG Re- gluing but with better degreasing and I ruffed up the legs of the pin for more mechanical grip

R
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Joined: 04 Jul 2013, 10:53

19 Sep 2014, 10:10 #5

Hi Russell,

I like your keel bulb mold (aluminum?) ... would have come in handy as that was one part of my build that was painful as it took two goes to get a mold out of plaster that was of an acceptable standard. Yours looks like you could start commercially casting bulbs!

Cheers,
John
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Joined: 27 May 2014, 05:58

19 Sep 2014, 22:23 #6

Hi John
I thought that would be the case with the bulb making....so if you have a cnc mill and a leftover bit of aluminum. Yes one could make many part from this mould. I did make two myself at the time.
But I think it would be cheaper to post the mould then the parts.. :lol:

R
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Joined: 27 May 2014, 05:58

27 Oct 2014, 03:21 #7

Hi
Just something else you can not do :roll:
Found out today how not to run sheet lines..... :o
Do not use very small wire snap hooks for a line pulley. It wear the line and the loose thread then get catch on the small hooks on the snap hooks.
This left the sails 3/4 out and stuck and so it took a while but I manage to get it to sail back to my side of the lake and a easy pickup. :D

Russell
jib sheet line wear.JPG
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Joined: 14 Dec 2014, 16:43

15 Dec 2014, 08:21 #8

Hi there,
From one who is just starting I offer my congratulations. Well done!
I like the idea for the wind tunnel. I will remember that for later - much later!
Tony...
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Joined: 27 May 2014, 05:58

16 Dec 2014, 05:15 #9

"I like the idea for the wind tunnel. I will remember that for later - much later!"
Your welcome Tony and welcome aboard. What are you looking at building?


Made my self a boomvang using some 1/4 brass and 3mm thread far better than the string
005.jpg
old
002.jpg
new
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Joined: 14 Dec 2014, 16:43

17 Dec 2014, 16:38 #10

Hello m-o-t,
Thank you for the welcome.
My intention is the make the Racing Sparrow 750. I have just completed the "planking"
stage - except for the Transom end which is giving me a problem. I really should have
departed from the instructions and fitted the transom - with a block under to hold it at
the right angle - at the same time as the other ribs, and fixed the planking to it as I went.
To late now!
When I get that sorted the next thing is to find out what thickness or weight of
fibreglass cloth to use. I have e-mailed Wests asking them for a recommendation of which
of their resins to use.
Then it will get messy!
A little early perhaps - but have a good Christmas.
Tony...
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Joined: 27 May 2014, 05:58

12 Mar 2015, 09:49 #11

Just showing off..... a day on the water with my first boat...got the deck wet a few times... this is what I think it's all about.. relaxing fun and time out.

http://youtu.be/XZLimhvVy6k

The set up ...used a 808 key ring camera on this rig so as to get the feeling you are standing on the deck not laying down on the job. lol
Did try to have the camera on a pivot so that the horizon would stay well, horizontal but it came out just a blurry 018.jpg
Have fun now

Russell
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Joined: 27 May 2014, 05:58

26 Jun 2015, 20:38 #12

Hi
Made some changes to the deck hatch opening so as to fit in a through deck power switch. In the photo it is the post with the flat top, made from brass tube and a micro switch below deck. One press and we are on :D
This allows me to power up without have to remove any deck covering. I went down in battery size from 1100 to 850AH, still more then enough power and a lot less bulky.
Look closely and you will see the bow repairs. In the lake I sail on the are old pool net support posts that I use as buoys...get too close.. some times. :oops:
I have had a go at making a paneled jib...look very good but yet to try it out.
If you look real close on the repair image you can see where I have used SS wire to hold the mainsail to the mast instead of tieing it, this make changing the main much simpler
You might be asking WHY THE ORANGE paint.....well the one I was going to use had no pressor left in the can...and orange was all that was left in my paint box :(
Other things that have changed, but not this time from original design include adjustable inner stays, screw adjustable boom vang, sail winch, aluminum keel, leech adjustment on jib.

Hoping to get out today.. weather permitting.

Have fun now

Russell
009.jpg
New jib
010.jpg
Mods repairs
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