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>> Home > Boat Building Blogs > DAMEN STAN 4207
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mdlbt.com/23550
DAMEN STAN 4207 Print Booklet
Author: RHBaker   Posts: 17   Photos: 47   Subscribers: 1   Views: 2289   Responses: 10   |   Most recent posts shown first   (Show oldest first)

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mdlbt.com/27203
DAMEN STAN 4207 - Posted: 1st Apr 2017
R.I.B completed, adding about another 1 oz to the vessel weight, also added the 4.5 oz as permanent ballast. Total model weight is now 156 oz.
On review of many HMCC “Vigilant” pictures, note the top of the boot-topping can be almost coincident with the waterline. Decided the slight extra weight , beyond the 4.5 oz originally tried, will help raise the bow and have little effect on the stern draft, so left it as is.
Sailed again in the portable pool and now consider the trim acceptable. The boot topping is visible for the full length of the hull; she sits very much like the full size vessel.
Once the ice to leaves our local pond will see how well she performs in open water and what the run time will be.
Have tried several approaches to making a R.I.B launch / recovery mechanism, but with little success. Seem to be able to either launch or recover using a single radio channel, but not both. Now decided to shelve this feature until inspiration strikes!

Attached Photos - Click To View Large

Response by Trillium on the 1st Apr 2017
Those scratchbuilt railings, visible in the stern closeup, are very impressive.

mdlbt.com/26552
DAMEN STAN 4207 - Posted: 5th Mar 2017
Repositioned 2/3 of the battery weight 8” sternwards into the only convenient location available. Rewired so the battery segments remain in series and the 7.2 volts operating voltage retained.
Was able to retest and determined that adding 4.5 oz of ballast at the stern established a similar waterline to one of the pictures the model is based upon. Considered moving the remaining battery cells sternwards to avoid ballast, but this would be difficult due to the internal configuration of the model.
The effect of saving the 4.5 oz ballast on a 9 lb model would have little discernible effect of the waterline, am thus reconciled to adding a small lead weight of up to this amount under the stern slipway.
The next step is to complete the stern R.I.B and devise a launch / recovery mechanism. Whatever the weight of these item turns out to be will need to be subtracted from the 4.5 oz and become the final ballast weight.

Attached Photos - Click To View Large


mdlbt.com/26501
Damen Stan 4207 - Posted: 3rd Mar 2017
Although we have had several signs of spring, the local outdoor pool is still closed. Our club was requested to attend a local boat show, using our portable pool, so took the opportunity to test the vessel as she is now almost complete.
In an earlier post described that if the later additions could be contained within 2 lbs the model should be close to the correct waterline. This was determined by using weights balanced at the stern. So far, have added about 1 ½ lbs, but mainly around the mid section.
From the attached pictures it can be seen that the bow is slightly low and the stern high. This suggests that by moving weight within the hull the correct balance can be obtained. If 16 oz is placed at the stern both bow and stern become correct. Am loath to just add ballast, prefer to rebalance and retain the current weight.
Fortunately within the hull there is space towards the stern that can accommodate a heavy component. Had been reluctant to commit to either a stick or stack style NIMH battery, so decided to make one up using two plastic C type battery holders and individual C cells. See picture.
The electrical system is 7. 2 volts, the cells were divided into 4 and a two cell trays. The heavier of these was disconnected and moved 8” sternwards. It is too early to finalize the weight distribution as have to build the R.I.B. and it's launch/retrieval system. Think that moving this 12 oz sternwards though the vessel should be close to the correct waterline.Hope to be able to check that shortly.
From the stern picture a list to starboard is evident. This is easy to correct by moving the batteries slightly in the opposite direction.
Although the pool is quite small, was able to test all the other functions. Scale speed was realistic and during a sharp turn little heeling is apparent. Everything else, bow thruster, fire hydrant, lights, radar scanner, fin and rudders work satisfactorily.

Attached Photos - Click To View Large


mdlbt.com/25413
DAMEN STAN 4207 - Posted: 16th Jan 2017
Finished the structural work and painted the partially assembled model. Environment Canada has advised winter is now officially half over, so have decided to suspend further efforts on the detail components and focus on repairs and upgrades to my fleet in anticipation of the forthcoming sailing season.
Readers may recall concerns over the weight of this model and stability. The final trial test showed the performance at 7.2 volts was satisfactory and that using two 5,000 mA NiMh stick cell sets in parallel gave a running duration in excess of a hour. After trawling E Bay found a source of 10,000mA NiMH C size cells. Unfortunately the seller would not advise the weigh of these cells, eventually decided to purchase some for a trial.
After the usual delivery period the cells arrived, so made up a 7.2 volt set using plastic 2 x 4 C cell battery holders. The total weight of the assembly was 8 oz less that the two stick cells! If the duration works out this will contribute significantly to efforts to minimize weight. Think the effect on stability will be little as it was good during the earlier tests.

Attached Photos - Click To View Large

Response by Trillium on the 17th Jan 2017
Great to see a model of a very modern vessel; as you say the type has been used by many countries so there's lots of scope for variations by other modellers.
It's looking good.

mdlbt.com/25058
DAMEN STAN 4207 - Posted: 6th Jan 2017
Am building this model to replicate HMCC Vigilant. Up until now have found that this vessel and the hull of the standard Damen Stan 4207 production similar, so the Damen drawings have worked well. Moving to the superstructure this is not the case, whilst the two vessels are broadly similar, there are many differences. The photos available on the Internet enable these to be identified, but the pictures kindly sent by Liverpool Maritime Museum proved enormously vaulable. These were so good that dimensions could be scaled off to help replicate details. The Canadian Hero class tends more towards the Damen standard, although have many pictures of this they confirm the drawing details.
Started on the superstructure, using styrene as it is light and easy to work. The structure is now virtually complete, built from a combination of styrene sheet, strip and wood strip. Made the bridge and mast structure removable from the lower portion to assist any future repairs and to add interior detail.
The mast was a particular challenge as it is quite complex. With the objective of reducing weight and thus heeling moment, made this from styrene tube. This material is easy to work, but an extra wire for the light grounds becomes necessary. Fitted a common ground using a bare wire with the various negative LED terminals soldered to it. The positive feeds are all individual and will need to connect beneath the bridge deck to install the correct LED & resistor combinations. All the wires were passed inside the mast legs. Hope to never replace a LED, that will be a real joy!
So far, the weigh of the superstructure (less final wiring, glazing, paint and detail) is 14 oz. This should allow the model to be completed at around the 9lbs total, the target established from the earlier buoyancy tests.

Attached Photos - Click To View Large


mdlbt.com/24595
DAMEN STAN 4207 - Posted: 2nd Dec 2016
The weather has turned colder and forstalled any temptations to spend valuable boat building time outdoors. Have now been able to focus on finishing the hull.
This was done with the usual technique of rubbing down (both mechanical and manual) and then filling any depressions or defects with either wood filler or glaze putty. Then rubbing down again ' and again!
After each completed rub sprayed the hull with aerosol paint, initially primer, then working up to colour and finally a clear matte to protect the decals and dull the earlier gloss finish. I prefer to use gloss for the intermediate coats as it reveals the surface defects clearly.
The only problem encountered was with the opening stern gate, after much trial usage this began to get a 'chatter' during opeation. Dismantled and examined the micro servo and found that several small gear teeth had broken off. Attributed this to operating the gate by hand during the build. In future will only operate the gate under power. Whilst more time consuming this prevents any tendency for the linkage to go over centre and lock up, thus overloading and breaking the small gear teeth.
The pictures show the hull finished up to deck level. There are no fittings installed.
From now on anticipate the model completion will follow traditional lines, so will confine blog entries to those that either capture a milestone, or where something interesting or unusal has happened.

Attached Photos - Click To View Large


mdlbt.com/24497
DAMEN STAN 4207 - Posted: 26th Nov 2016
Decided to leave the batteries connected up in series and use an adjustable voltage regulator to vary the voltage and determine the ideal. Total hull weight was checked and is under 7 lbs.
The pond was again nice and calm, so first investigated the effect of adding weight to see how much could be added to finish the remainder of the model. With the boat floating 'as built' the bow is slightly down vs the stern. I have several 2 lb weights, so balanced one on the RIB slip. The bow rose above the waterline and the stern sank to slightly below it. Tried a further 2 lb weight and the water almost reached deck level! The ideal seems about 2 lbs, but mounted further forwards towards the centre of the model.
Left the first weight in place and started voltage runs. At the base voltage of 7.2 (the NiMH rating) performance was good. The model has a nice turn of speed and is totally predictable. Increased the voltage in 1.2 volt increments to replicate NiMh voltage steps. As the voltage increased the vessel obviously goes faster, but the turning response becomes rapid and very sensitive.
Finally increased the voltage to the a maximum of 14.4 volts and decided the ideal would be 7.2 volts. This also allows all the vessel systems to work at this voltage without a voltage reducer for the bow thruster. With the cells wired in parallel, this should give over 3 hours running time.
Continued to experiment with the model for about 1 ¾ hours before a drop in performance was noticed, indicating discharging cells. During this period was able to make further assessments of the performance of the linked rudder / fin system. This system flattens turns, reducing heeling and gives a tight turning circle. If anything it is tighter than the full size vessel, so a real crew would need to hang on very tightly during max rate turns!
To my relief the only trace water was from one of the propeller shafts, the hull is sound and without leaks.
Unfortunately the weather has now turned colder and cannot do any further sailing until next Spring. At least can continue building confident in the knowledge this is the basis of a great model, one which will justify the many hours needed to finish it properly.

mdlbt.com/24423
DAMEN STAN 4207 - Posted: 18th Nov 2016
The weather is still mild in Canada and our local boating pond has not yet become an ice rink. Decided it would be worthwhile to check the ballast (to be sure the hull was not too heavy, thus rendering it scrap), then assess performance and the operation of the fin/ rudder linkages.
The day dawned windless and bright, ideal for a test sail. Lowered the hull carefully into the water and checked the waterline against the marks added from the plan. To my immense relief, both bow and stern rode above the waterline marks. The stern rode higher than the bow. This was reassuring as the bow already contains most of the final features, but the stern requires engine air intakes, the RIBs , cranes and other finishing details. As these are added the stern should sink lower, raising the bow.
Although the 2 x 7.2 X 5000 mAh NiMH batteries fit snugly on both sides of the keel they can also be moved towards the stern to help obtain correct levels. This means the final balance can probably be achieved by moving components and not adding ballast.
The moment of truth! Powered the model up and was pleased by the operation of the fin/rudder combination. In hard turns, if anything the hull inclined into the turn; nevertheless it was stable. This suggests that operating the fins and rudders at the same ratios is close to correct. Using a servo for each mechanism simplifies the linkages and internal congestion of the model.
The speed of the model far exceeded any semblance of scale, making the controls sensitive and unstable. Currently have the batteries connected in series, will modify to parallel and hope this should give a close to correct performance.
This experience was similar to my HMS Beagle model, which is considerably heavier and bulkier. As the power trains are virtually identical, the reduced voltage should be near correct.

Attached Photos - Click To View Large


mdlbt.com/24291
DAMEN STAN 4207 - Posted: 11th Nov 2016
Removed all the internal components and wiring, then painted the inside of the hull with a light grey paint.
The upper hull was sheathed with 1mm ply from the spray rail to the deck. The construction adhesive used to reinforce the bottom sheathing worked so well, used it entirely on the upper. Applied a generous amount to the faying surfaces, then squeezed the excess out and smoothed it into a fillet shape. The forward hull sheathing was left oversize as the drawings show the hull side contours extend up beyond the deck to become plated bulwarks.
Once the upper hull sheathing was complete, fitted a series of brass rod stanchions to the foredeck to support both the upper hull sheathing and a section of styrene used to extend this sheathing up to the top of the plated bulwark, as shown in pictures. Have found the stanchions idea helps when butting one thin sheet to another as it reinforces the joint.
After the adhesive had cured, the plated bulwark upper edge was gently filed to the correct contour and size. The hull sheathing was covered in glass fibre cloth and resin, which was lipped over the bulwarks and then carried down the inside face to deck level. This adds immeasurably to the stiffness and robustness of the bulwarks.
Have always thought hard chine hulls would be easier to make than round bilge ones. This one has proved the opposite, perhaps the raised bulwarks, operable sterngate, RIB well and chine rails have added to the complexity and account for the challenges experienced.
The hull has now been covered in glass fibre cloth and resin with the interior painted. This was an opportune time to fit everything and check operation before the rubbing down and finishing was started. Any further modifications could thus be completed without damaging the finished model. All the components were refitted and the operation rechecked.

Attached Photos - Click To View Large


mdlbt.com/24209
DAMEN STAN 4207 - Posted: 4th Nov 2016
Gave the sterngate some thought and decided a strategically located bell crank and linkage would transmit sufficient servo travel to open and close it. This would also allow limited access to the servo and linkage to assist in any eventual repairs or servicing. A mock up of the installation confirmed this. Transferred the dimensions and layout into the hull and installed the sterngate frame. This moves correctly as the servo is stroked.
Could have now moved to sheath the outside of the hull and fit the deck. Decided it would be better to install all the electrical components first and then do a trial run of every function in case any issues arose. This proved wise, many minor adjustments had to be made to bulkheads and structure to allow control rod and wiring.
Once everything was installed, connected the components as appropriate and powered the various systems up.
The rudder, fin and motors all worked as planned. The fire hydrant pump and the bow thruster were also fitted. The direction (polarity) of these components is important so the wiring was colour coded to ensure correct final fitting.
Once all was installed and operating correctly, weighed the partially completed hull recognizing that with the major components fitted the weight would not be too far off the finished weight. It weighed in at about 6 lbs, so estimate when the hull is fully sheathed and painted it will be around 7 lbs. This does not include the superstructure and lighting.
This was an opportune time to photograph the interior installation and some pictures are attached. The wiring was deliberately left loose so it could all be removed and reinstalled when the hull sheathing was complete.

Attached Photos - Click To View Large


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