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New 21 beginning construction
Posted 11 December 2017 - 10:53 AM
Photo of sponsons: This the way if you build sponsons to get them TRUE to the water level and to each other.
Had to build a new different motor mount to get some room between end of the collet and bulk head.
Had originally move the motor location back one inch. So lost 1/2 inch.
Todays job is to get on the mill and modify hardware to fit on the narrow transom and build adjuster blocks for rear boom tubes.
Posted 12 December 2017 - 12:51 AM
Posted 12 December 2017 - 08:22 AM
Doc if you have the sponson aoa correct adjustment is not needed. These boats react more to strut adjustment than anything else. But those blocks would help keep the turn fin in its place
Posted 12 December 2017 - 02:21 PM
Mike, the only way I know to have both sponsons
Perpendicular to the water and dead on both with the same angle and position to each other is to do what I did
Gluing and sponson tube or insert and not do this procedure the inserts and tubes and just glue them they will get angle either up down back forward or a combo of all 4.
I have had that problem in the past
Then adjuster blocks used to adjust for the front tub sponson insert that can be off when glued in place
Had that problem with my 101 JAE boat and had to put them long after the boat was built and after doing some measurements. The front hull tube was off and there was a significant difference between the angle of attach of the front sponsons
Posted 18 December 2017 - 07:56 PM
Posted 22 December 2017 - 01:54 PM
I sent the pic of you sponson alignment process to Joe Petro. Best idea yet for getting those tubes in straight!
Where do you buy the carbon dyvinicl? It should be much stiffer than wood which is really good. Do you know if the 1/8" - 1/32" composite is as light as wood?
Posted 22 December 2017 - 06:25 PM
Posted 23 December 2017 - 03:03 AM
Looks really good Doc,
What are you using for sponson tubes? Are they carbon fiber tubes or solid rods & what size are they?
Posted 23 December 2017 - 09:41 AM
We have been getting are carbon fiber recently from DRAGON PLATE
The set up for putting the sponson tubes was originally a Mark Bullard concept,
Also another building concept: When gluing in the front tube in the tube, put the boom tube in the brass tube, rest the BOOM TUBE ON EACH SIDE OF THE TUB ON Flat blocks of the same height/ thickness. Then set the bottom of the tube on a block of the same height and put weight on the tube.
This insures the bass tube is PARALLEL TO THE BOTTOM OF THE TUB AND THUS THE BOOM TUBE IS PARELL TO BOTTOM OF THE TUB/water
The rear boom tube is taken care of by the adjuster blocks
If the adjuster blocks are in the front due the same process to the rear boom tube
Posted 23 December 2017 - 12:24 PM
1/8 in x48 in sheet : $10 cut to the width you want plus shipping
48 inch x 70 mm $10/inch(width) plus shipping
Call Mark Bullard to order: 256 303-6423