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Forum: Scratch Building, Aircraft Design, 3D/CAD

06-30-2022, 05:58 AM

Replies: 7

How common is this lightening foam core wings

Views: 1,748

Posted By critx

How common is this lightening foam core wings

Hello ,
I have a small home shop with hot wire cutter, vacuum bag where I build planes my own - nothing high tech, so I build small fun planes up to 1200mm wingspan I used to make wings out of foam...

Forum: Scratch Building, Aircraft Design, 3D/CAD

07-15-2021, 05:30 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

After building this plane that it turns that...

After building this plane that it turns that flies very well I found that sheeting foam core wings with balsa and fiberglass is adding still too much weight for small wing span. This technique is...

Forum: Scratch Building, Aircraft Design, 3D/CAD

05-31-2021, 08:29 AM

Replies: 3

How practical a test of a "Jetoptera" Fluidic Propulsion RC scaled

Views: 1,502

Posted By critx

allanflowers (javascript:void(0)), That is a fair...

allanflowers (javascript:void(0)), That is a fair feedback.
Interesting ... I'm wandering how (?) the investors are not able to figure out their money are already lost - as you suggest. Although I'm...

Forum: Scratch Building, Aircraft Design, 3D/CAD

05-30-2021, 10:12 AM

Replies: 3

How practical a test of a "Jetoptera" Fluidic Propulsion RC scaled

Views: 1,502

Posted By critx

How practical a test of a "Jetoptera" Fluidic Propulsion RC scaled

Hello,
I'm not active on the forums, but I do follow new posts . I'm building balsa planes my own.

I've been reading about "Jetoptera" design and seem interesting. Coanda effect, augmented thrust...

Forum: Scratch Building, Aircraft Design, 3D/CAD

03-05-2021, 10:32 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

So after some good recovery I'm now able to spend...

So after some good recovery I'm now able to spend some time in my shop.
Below shared some pictures with progress of this week.
Wings from white foam cutted with hot wire then laminated with 1.5mm...

Forum: Scratch Building, Aircraft Design, 3D/CAD

01-20-2021, 02:42 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

@speedracerntrixie...

@speedracerntrixie (https://www.rcuniverse.com/forum/members/speedracerntrixie.html)
I'm curiouse do you add any carbon or wood spars to stregten the wing?
Or is it fine a 48" wingspan without?...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-29-2020, 12:00 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

Sorry for my late answer. My medical condition...

Sorry for my late answer. My medical condition and surgery that is planned in two weeks will make me postpone this build until in the spring next year.

The sheeting on your part looks really good...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-18-2020, 12:12 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

In 2012 if I well remember I build a 1.2m flying...

In 2012 if I well remember I build a 1.2m flying wing that was foam core + balsa sheeting + oracover and went little heavy but it was flying very well. So questions here was to find ways to improve...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-17-2020, 12:39 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

I did a test gluing 1.5mm ( 1/16 ) balsa on a...

I did a test gluing 1.5mm ( 1/16 ) balsa on a foam core wing section using Gorilla glue and result is nice.
I actually have some 17 grams fiberglass and will start with a small test see what comes...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-16-2020, 12:40 PM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

About applying glue in strips I am not sure. In...

About applying glue in strips I am not sure. In time, the wood with/without glue would behave different.
Thinning the glue seems better alternative to ensure minimal glue quantities are used. It can...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-15-2020, 11:47 PM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

I estimated if I cut the wings from 20kg/m^3...

I estimated if I cut the wings from 20kg/m^3 density white foam, the total weight of the foam is 65 grams. So I wander it makes sense to complicate the build for that small.

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-14-2020, 11:00 PM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

Clear now. Appreciate the help. For the next...

Clear now. Appreciate the help. For the next couple of days I'll do some tests with both Gorilla glue and Titebond. Will find which of variants I can get better result from.

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-14-2020, 02:57 PM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

tedsander It's clear and makes sense all...

tedsander
It's clear and makes sense all instructions to me. I trust it is a good/proven technique.
Using acetone to thin the glue makes sense to me but I would like to ensure I did not...

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-14-2020, 10:00 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

speedracerntrixie...

speedracerntrixie (https://www.rcuniverse.com/forum/members/speedracerntrixie.html), thanks for the feedback. I find it very usefull.
And by the way, ... nice plane!!

Forum: Scratch Building, Aircraft Design, 3D/CAD

11-14-2020, 05:24 AM

Replies: 27

Foam core blasa sheeting 43" sport wing - does it works

Views: 7,459

Posted By critx

Foam core blasa sheeting 43" sport wing - does it works

Hi,
I'm scratch building balsa planes sometimes. This time I was thinking to make the wing using lightweight (white )foam core sheeted with 1.5mm ( 1/16") balsa. Than cover with some oracover or...

Forum: RC Airboats

10-27-2019, 01:02 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

Can you please suggest a suitable motor supplier...

Can you please suggest a suitable motor supplier that is of good quality and performance?

Forum: RC Airboats

10-23-2019, 09:25 PM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

The unconventional design with taller than wider...

The unconventional design with taller than wider tub is to reduce the air lift created by the hull. This rigger is not supposed to be too maneuverable, I can increase distance between sponsons for...

Forum: RC Airboats

10-23-2019, 09:21 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

[/left] First step - 60 mph - with this design ...

[/left]
First step - 60 mph - with this design
Final target - 100+ mph - with a next design build based on lessons learned

Forum: RC Airboats

10-22-2019, 09:00 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

@GotRPM thanks for your input. The first...

@GotRPM thanks for your input.
The first important topic is to have a good sizing of battery-controller-motor and later will have to test different propellers for best performance.
Below is a rough...

Forum: RC Airboats

10-17-2019, 05:28 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

So after some search and estimats I got thinking...

So after some search and estimats I got thinking I could start with this:
Prop: 10x8 or 10x7 ( some good quality supplier for testing)
Battery : 10S / 2200mAh / supporting up to 100C - buy 1S packs...

Forum: RC Airboats

10-17-2019, 02:30 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

I had a look at Dan Jones airboat. Very fast and...

I had a look at Dan Jones airboat. Very fast and nicely built.
But I am thinking to have a smaller/lighter configuration - also made full out of carbon fiber. I will look for short straight line...

Forum: RC Airboats

10-14-2019, 09:47 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

Thanks, sounds nice but I still have to stick to...

Thanks, sounds nice but I still have to stick to electric.

Forum: RC Airboats

10-13-2019, 07:05 AM

Replies: 22

Design a fast airboat outrigger

Views: 8,285

Posted By critx

Design a fast airboat outrigger

I am looking to design and build a fast airboat rigger.
What would be best power plant combo to achieve really good speed for a slim boat long of 800-900mm (~32") and estimated at 2kg (4.5 pounds)?

Forum: RC Airboats

01-12-2013, 03:36 AM

Replies: 8

Canard configuration airboat CG ?

Views: 2,003

Posted By critx

RE: Canard configuration airboat CG ?

@Altered1, thanks for the feedback.

This boat will have rear sponsons, with puller prop in the back of the CG. I will post a sketch in the next few days.

But you say something that makes...

Forum: RC Airboats

01-11-2013, 11:46 PM

Replies: 8

Canard configuration airboat CG ?

Views: 2,003

Posted By critx

RE: Canard configuration airboat CG ?

@pinky_d_brain I apologize I have missread your message regarding the CG. It looked strange to me also anyway but a picture just striked me later where a canard boat is on its stand but with the back...

Showing results 1 to 25 of 42