P1 Puma RIB racing-scratch building
- Topicstarter Dim L
- Startdatum
Thanks Jan!
You are right, my plan is for a 4s setup on the RIB (76 cm).
I think that the outboard is too heavy for the Cozy (a hard estimation is approximately 400 gr with the cover and the motor of course).
The lighter mini TFL seems more suitable for the Cozy and as you have shown that it can achieve high speeds
!
You are right, my plan is for a 4s setup on the RIB (76 cm).
I think that the outboard is too heavy for the Cozy (a hard estimation is approximately 400 gr with the cover and the motor of course).
The lighter mini TFL seems more suitable for the Cozy and as you have shown that it can achieve high speeds
!Update #11: RIB & outboard
Hi everyone, below I summarize the progress so far:
1) I made the steering arms and the mounting plate for the cover in one piece using cf, aluminum and screws. It was quite tricky to combine all these parts together. The plate needs to be trimmed nicely to fit the cover.
2) the cover of the outboard shown in the photos is the mold that I will use to make a new cover, lighter and more symmetrical compared to the previous one.
3) the outboard was mounted on the hull. The shaft of propeller is just below the keel and the height of the outboard is >10mm adjustable.
Next step, constructing a servo plate and fit the servo in the hull before the working are becomes too narrow.
Sorry for my feet I didn't notice...
Overall, I am satisfied with the progress of the building and I think that the outboard fits the hull harmonically.
Hi everyone, below I summarize the progress so far:
1) I made the steering arms and the mounting plate for the cover in one piece using cf, aluminum and screws. It was quite tricky to combine all these parts together. The plate needs to be trimmed nicely to fit the cover.
2) the cover of the outboard shown in the photos is the mold that I will use to make a new cover, lighter and more symmetrical compared to the previous one.
3) the outboard was mounted on the hull. The shaft of propeller is just below the keel and the height of the outboard is >10mm adjustable.
Next step, constructing a servo plate and fit the servo in the hull before the working are becomes too narrow.
Sorry for my feet I didn't notice...
Overall, I am satisfied with the progress of the building and I think that the outboard fits the hull harmonically.
Looks very good so far !
Nice work !
Nice work !
Update #12:
Some progress with the cowl of the RIB:
The cowl is made of 1mm plywood, 3mm balsa, and polyertherne. Then, I will cover the polyertherne with 1mm balsa and then laminate with fiberglass.
Until now everything goes according to the plans.
My area is again under snow...
Some progress with the cowl of the RIB:
The cowl is made of 1mm plywood, 3mm balsa, and polyertherne. Then, I will cover the polyertherne with 1mm balsa and then laminate with fiberglass.
Until now everything goes according to the plans.
My area is again under snow...
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Dirk Jan
Forum veteraan
The boat turns out really nice Dim. It's great to see your CAD design coming to life, right? [emoji3]
With your home made outboard behind this hull, it is truly a great project [emoji106]
Wow, snow again in March.. it must be special? We have about 14 degrees here now. Spring is around the corner!
With your home made outboard behind this hull, it is truly a great project [emoji106]
Wow, snow again in March.. it must be special? We have about 14 degrees here now. Spring is around the corner!
Oh yes Jan this is very true. You know that better than me I guess
!! Actually, this stage of the project and the maiden sail are the best moments for me.
Thank you very much for nice words.
Needless to say that all you, the members of this forum, with your friendly and supportive attitude have helped me a lot with both of my projects!!
Cannot agree more!
A lot of fun to see you progressing with this design!
It is uncommon that we have spring here in the Netherlands.
Always amazing to see that other places have unusual/uncommon weather as some sort of result!
I like the build, but have one concern. Isn't the outboard-unit mounted too low? The prop looks fully submerged at the picture in post #143.
Thank you very much for your comment Eric.
I think that is the angle of the picture.
The starting point for the height of the outboard is so that the propeller shaft is just below the keel.
The height of the outboard is also adjustable (>10mm).
Finally, there is always the option of opening new holes on the mirror and change the height considerably!!
I think that is the angle of the picture.
The starting point for the height of the outboard is so that the propeller shaft is just below the keel.
The height of the outboard is also adjustable (>10mm).
Finally, there is always the option of opening new holes on the mirror and change the height considerably
!!Update #13.
The shape of hull is even more visible now. I built the upper deck using 2mm balsa stripes which bend easily and are able to follow the curves of the plan. The inner was laminated with 180gr cf and 110 fiberglass. The edges were reinforced with an extra layer of fiberglass.
Next steps: a) filling with polyertherne foam b) building the inner of the hull (covering the foam with 1 mm balsa and laminating and c) sanding, sanding and more sanding...
PS. The weight of the hull with the cover is 825 gr. I ve already exceeded my goal (<=800 gr) so the new more realistic goal is < 1100 gr.
The shape of hull is even more visible now. I built the upper deck using 2mm balsa stripes which bend easily and are able to follow the curves of the plan. The inner was laminated with 180gr cf and 110 fiberglass. The edges were reinforced with an extra layer of fiberglass.
Next steps: a) filling with polyertherne foam b) building the inner of the hull (covering the foam with 1 mm balsa and laminating and c) sanding, sanding and more sanding...
PS. The weight of the hull with the cover is 825 gr. I ve already exceeded my goal (<=800 gr) so the new more realistic goal is < 1100 gr.
Update #14.
Hi everyone I hope you are having great time.
I bought a new brand of polyertherne and I applied more than necessary. The result looked like a nuclear disaster...
Fortunately the mistake was fixed.
The balsa stripes were too weak so I decided to laminate with cf.
I am planning to leave some area of visible cf.
P. S. 5th day of snow and cold here! Finally, there is some sun today.
Hi everyone I hope you are having great time.
I bought a new brand of polyertherne and I applied more than necessary. The result looked like a nuclear disaster...
Fortunately the mistake was fixed.
The balsa stripes were too weak so I decided to laminate with cf.
I am planning to leave some area of visible cf.
P. S. 5th day of snow and cold here! Finally, there is some sun today.
You have a lot of sanding and smoothing to do
You are progressing well!
I noticed another topic where they use Fusion 360.
Not a fast model, but certainly impressive work!
You are progressing well!
I noticed another topic where they use Fusion 360.
Not a fast model, but certainly impressive work!
I think for each discipline of RC modeling - where you build a model from scratch - sanding consumes the most time of the whole building process
I would not know how to do it differently to reduce the amount of sanding
Yes, 3D printing. But have a look (when you have time after the sanding) at the topic I posted above.
They build a hull using FDM 3D printing, like I am using for my pumps. Sanding, sanding and sanding follows after the 3D printing process
I would not know how to do it differently to reduce the amount of sanding
Yes, 3D printing. But have a look (when you have time after the sanding) at the topic I posted above.
They build a hull using FDM 3D printing, like I am using for my pumps. Sanding, sanding and sanding follows after the 3D printing process