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May 24, 2011, 04:12 AM
Registered User
maverick4you's Avatar
Discussion

Sail Boat Surmount Ballast Weight


Recently i have bought by Hobby King a Surmount sails boat, well made and very cheap boat but without a string of instruction or suggest.
For the assembly of the model i have search photos and other info in the net but i can't found none info about the ballast weitgh
Hobby King suggest a weight of 1,3kg ..... it seems much
Is there a rule for compute the of ballast weigth?
Some one have a Surmount can give me a suggest?

many thanks at all
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May 24, 2011, 05:51 AM
Don't lie to my dog.
Gregg28's Avatar
The website lists 1.3kg, which is not out of line for an 800mm boat. If anything, it may be a little light. The picture shows a preformed ballast bulb. Why not just use it?

Spec.
Length : 800mm
Height : 1520mm
Weight : 1.4kg
Area of Sails : 0.25m2
Ballast weight: 1.3kg
May 24, 2011, 08:17 AM
Registered User
seefest's Avatar
Because it hollow! You must supply your own ballast.
May 24, 2011, 08:56 AM
Useful Idiot
Quote:
Originally Posted by seefest
Because it hollow! You must supply your own ballast.
Fill the bulb with small lead shot for shooting or belt weights for scuba diving. You'll possibly get more than that 1.3 kgs if the shot is made from tungsten.
Be prepared to substitute your fixed and runing rigging with Spectra and be careful of leaks around the hatch opening.
May 24, 2011, 09:22 AM
Registered User
Hi, I have my surmount well over a couple of years, and I have updated this tiny thing several times. Keel is reworked and lengthened to 350mm. I currently use 1000g bulb and it performed quite well.
I think 1.4kg is to much for such a little boat, which may cause to high a waterline and drag.
I would say, 850g is minimum for a lengthened keel to keep it going in light air.
Last edited by triplane; May 24, 2011 at 07:25 PM.
May 24, 2011, 12:35 PM
Registered User
maverick4you's Avatar
Quote:
Originally Posted by triplane
Hi, I have my surmount well over a couple of years, and I have updated this tiny thing several times. Keel is reworked and lengthened to 350mm. I currently use 1000g bulb and it performed quite well.
I think 1.4kg is to much for such a little boat, which may cause to high a waterline and hug drag.
Thanks at all for reply and suggest, i think will buy a small diameter lead shot and hope to reach 850gr/1000gr.. of ballast..
May 24, 2011, 03:49 PM
groundlooped
g'day mate, our guys sail most of the hobbyking boats including ths surmount,plenty of tips and how to, here www.shipshaperc.com
Cheers Col
Aug 27, 2011, 02:00 PM
Fly Safe !
Lucke's Avatar
Would be 850g enought ?

About the receiver is better 6 or 4,8v ?

Im a newbie on sailboats and hate the manual of this model...
Aug 27, 2011, 07:04 PM
Useful Idiot
Quote:
Originally Posted by Lucke
Would be 850g enought ?

About the receiver is better 6 or 4,8v ?

Im a newbie on sailboats and hate the manual of this model...
The receiver should work both on 4.8 and 6 V, but the servo power is more on the higher voltage, which may be helpful in the sail servo.
Brazil has some of the world's leading sailors in the smaller RG65 class, and the link: http://www.abvrc.com.br/ could be of interst to you.
Sep 10, 2012, 04:43 AM
Registered User
People mention casting lead to fill the hollow bulb.
How much weight of lead can be inserted this way in to the standard bulb ?
I presume a plug is made and casting is into sand or something similar.
Sep 10, 2012, 05:34 AM
Registered User
If you re using #9 lead shots for the keel. It will barely fit in at about 800gm.
We have tried it...
Sep 10, 2012, 08:07 AM
Registered User
I presume a cast keel would be heavier than shot. The bulb would be opened and the cast blob placed inside.
Alternatively the bulb could be disgarded and the lead used instead.
Still curiious how heavy a cst blob cann be inserted in the supplied bulb.
Sep 10, 2012, 05:06 PM
Registered User
@Colbourne:

There are now at least two versions of the Surmount. If you have purchased the boat recently, it will be different in that the keel bulb is a different shape.

One the earlier versions, the keel bulb was circular in cross section. If you tried hard you could get it up to maybe 700 grams gross weight.

The newer version keel bulb is somewhat larger and is more oval in shape (wider than high),and is also probably a little longer. Empty weight is 38 grams. I filled mine with Number 8 shot, now weighs about 980 grams. Take your time and pack the shot in firmly with a pencil or similar item.

This is plenty of weight for this boat. Here is some video of mine in very rough conditions:
Surmount in windy conditions (2 min 38 sec)


Recommended mods:
Add flotation
Replace the backstay bowsie BEFORE it breaks
Seal the hatch with tape
Sep 10, 2012, 07:52 PM
Kimo
Nice video showing how the boat handles in both heavy and light winds. The canal that you are sailing in remindes me of the Ali Wai canal across the street from me. The only trouble is that there a strong currrents, mud flats from side creeks,lots of different hights of stone bottoms so you are never sure if you might run aground or not. Not to mention the strong wind that blows down the canal. The final straw is that if the boats grounds on the far side of the canal its a mile to the nearest bridge so a 4 mile round trip to reclaim your boat. So I will stick to the salt water tidal pond that we use.
Oct 10, 2012, 05:36 AM
BMFA 190658
SilentPilot's Avatar
Now then guys!

Glad I found this thread. I'm having trouble filling up my ballast weight myself, just does not seem big enough...

Picked up some top tips here. Maybe extending the keel with 850/900g will do for starters


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