Filling holes

[Flying Scotsman]

I have never done this before. What is the best method to fill screw holes of old hardware and you will be drilling into some portion of the filled holes for the new heavy hardware..Graupner brushless outboard... with existing plywood backing on a fibreglass hull.

Thanks,

Douggie

[longballlumber]

Douggie,

Are you filling holes in the fiberglass/wood hull or are you trying to fill the holes in the actual metallic hardware? I am assuming that you’re filling holes in the hull...

If that indeed is the case, I use wooden dowel rods to fill holes and super glue them in. Sometimes you need to enlarge the hole to get the correct dowel size. Make sure it’s a nice tight fit, since there is the possibility you will be re-drilling in the same location.

Mike

[Flying Scotsman]

You are correct in your assumption, a great idea...will the dowel be waterproof with super glue ? or should I use epoxy? I am refering to the end of the dowel on the water side of the transom

Douggie

[kookie_guy]

when I filled mine (BJ26) I put some packing tape to make the hole nice and flat/level. Stood the hull on it's transom, and from the inside, I poured fiberglass resin. It helps to roughen up the transom wood a little, and overfill so that it gets into the roughed up surface and bonds super hard. I also use plumbers putty to make a well and I overfill the hole from the inside. When it sets up (24 hours), remove the putty and packing tape, and off you go. The resin has bonded to the existing hull/transom, so drill away. You can drill half onto the hole, and you'll be fine.

[detox]

It will be tricky to redrill holes without the bit wanting to wander off course especially if you are drilling close to the filled holes. I would fabricate a guide plate to pilot drill bit strait. You could tack the plate on using CA glue and C clamps before drilling.


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[longballlumber]

You are correct in your assumption, a great idea...will the dowel be waterproof with super glue ? or should I use epoxy? I am refering to the end of the dowel on the water side of the transom

Douggie

Personally, I would put a little epoxy over it to be safe.

[Diegoboy]

That would be why I drill pilot holes.

I use the tape / epoxy method for small diameter holes like screws & such. I place a bit of paint in the epoxy to match the hull color. I do however, always replace or reinforce the transom doubler when I do this.

[longballlumber]

It will be tricky to redrill holes without the bit wanting to wander off course especially if you are drilling close to the filled holes. I would fabricate a guide plate to pilot drill bit strait. You could tack the plate on using CA glue and C clamps before drilling.


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Detox,

What I have done in the past is a very small drill size for the first hole then graduate to larger sizes. This helps with the wandering drill bit issue.

[wirenut67]

Douggie,

I love those motors! I have just been trying to incorporate one in a project. What are you using it on?

[Flying Scotsman]

Douggie,

I love those motors! I have just been trying to incorporate one in a project. What are you using it on?

Prather Lap cat 1...27" tunnel hull ..I just love the authentic viewpoint of those motors and now updated to accept brushless motors. It will not be a rocket but it will look cool. I have an existing SV27 motor and ESC which I will try

Douggie

[wirenut67]

Sounds Great. I look forward to hearing how it works out for ya.

[detox]

Detox,

What I have done in the past is a very small drill size for the first hole then graduate to larger sizes. This helps with the wandering drill bit issue.

I allways use this tool to locate center then drill pilot hole, but sometimes the larger bit will wander if drilling near filled hole.

http://www.greatplanes.com/accys/gpmr8130.html

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[egneg]

I allways use this tool to locate center then drill pilot hole, but sometimes the larger bit will wander if drilling near filled hole.

http://www.greatplanes.com/accys/gpmr8130.html

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That looks better than needing to have a whole set of transfer punches.

[detox]

I first tack my rudder and strut mount to stern using CA glue then use the Greatplanes Centering tool before drilling pilot holes.


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[Eodman]

Hey Doug, are you using the motor that came with it and if so what esc is recommended?

I need to sell afew things to come upw/ some cash so I can order 2 for my cat!