More videos! So nice to see the aircraft progress and testing!!!

Hola: acabo de descubrirte,me he visto TODOS los videos,sencillamente impresionante,muy buen trabajo de ambos,¿que tipo de Horten? te sigo,hasta pronto

@andreschavarria1450

4 жыл бұрын

Hola Edgardo, ¡muchas gracias! Es un diseño propio basado en el principio Horten. Te recomiendo nuestro blog, por si quieres saber más detalles del proyecto: hortenmicrolight.wordpress.com/ Además tenemos cuentas en Facebook y Instagram, donde subimos regularmente fotos: facebook.com/hortenmicrolight/ instagram.com/hortenmicrolight/ Muchos saludos, Andrés

Hi, thanks for sharing!!! Is the laminate in fact a sandwich? Did not know that it's possible to use infusion with a sandwich laminate.

@andreschavarria1450

Жыл бұрын

Here, it's a full laminate. Pure carbon fibers and no sandwich. There are some sandwich cores that can be infused, such as Soric and some perforated foams.

CLICKBAIT! WAS NOT HYPNOTIZED! Just kidding, this is very nice and detailed footage of vacuum infusion. I'm researching this and haven't seen such details so far in videos, so thanks a lot! What is the speedup of the footage? And what are those bubbles? They can't be vacuum spaces or they wouldn't move like that. So they must be air bubbles? Why is there so much air in there? Is it coming out of the resin or was it still in the cloth / flow media? Is this normal? Thanks again for sharing!

@andreschavarria1450

5 жыл бұрын

The footage was 20 time faster. A good infusion speed is roughly one to two cm per minute, but that depends on the laminate thickness. The bubbles are some resin fraction boiling due to the extremely low pressure (3 to 4 mbar) and the relative high room temperature (30 °C). If you look carefully, you can see how they build up about 5 cm behind the front. We degassed the resin before and vacuum was very consitent. So, it can't be air ;-) This effect is normal for very low infusion pressures. It's also clearly seen during degassing of resin. At some point after most bubbles were degassed, the resin starts to boil again. It doesn't affect the laminate and the resin properties at all. It's perfectly wetted and shiny as a mirror …

@dejayrezme8617

5 жыл бұрын

@@andreschavarria1450 Oh wow, interesting. I read somewhere that boiling some volatiles in the resin due to too low pressure can be bad. But I guess that depends on the resin. Does such low vacuum have any reasonable advantage? Like reducing the chance for voids and such?

@andreschavarria1450

5 жыл бұрын

@@dejayrezme8617 Well, no idea where you read that, but we asked a couple of years ago a producer of aircraft grade resin and they said that the effect is known, but that it does not affect final properties and strength. The amount of volatiles boiling is minimal, though it looks much stronger due to the low vacuum. Composition of resin is essentially not changing in that short time. Reducing vaccum above 10 to 15 mbar should prevent this effect, but keep an eye on consistency. Controlling a pump in that range is achieved by letting air in. Depending on the principle the pump is based on, it can end up in production of oil fumes, which can affect forthcoming laminates made in the same room. Low vaccums allow longer infusion distances and creation of tighter laminates.

@autoreplyvmz

5 жыл бұрын

@@andreschavarria1450 I take it you turn the vacuum pump off or increase the pressure before the laminate is cured? Otherwise you'd have a lot of voids?

@andreschavarria1450

5 жыл бұрын

@@autoreplyvmz Not really. The voids gather in the flow medium and do not affect the laminate. It is void free and the surface shiny as a mirror. Pressure in the infused regions is much higher than at the front.

Compoflex is better than sliced bread !!