{"id":785,"date":"2017-09-01T14:32:27","date_gmt":"2017-09-01T04:32:27","guid":{"rendered":"http:\/\/leederville.net\/rocket\/?p=785"},"modified":"2017-09-01T14:32:27","modified_gmt":"2017-09-01T04:32:27","slug":"internal-fillets-finairframe","status":"publish","type":"post","link":"https:\/\/leederville.net\/rocket\/index.php\/2017\/09\/01\/internal-fillets-finairframe\/","title":{"rendered":"Internal Fillets – Fin\/Airframe"},"content":{"rendered":"

Thought processes<\/h3>\n

I decided after much internal debating to create a fillet between Fin and the air-frame. (Though it is more from the previous fillet to the air-frame). I decided to do this because the instructions for Katana 4 mention Internal fillets to the Air-frame. I know some people don’t bother with these fillets and I can probably get away without having them for smaller motors. But if I want to fly larger motors or lots of flights I might experience issues with fins\/air-frame.<\/p>\n

So much focus has been on attaching the fins securely to the motor-mount and air-frame that it is easy to forget other possible modes of failure (other than fins coming off). I was a little concerned that the air-frame, being as thin as they could possibly fail due to loads. So I thought it would be prudent to strengthen the air-frame around the fins with this fillet.<\/p>\n

The Epoxy resin<\/h3>\n

I decided I didn’t want to go through with the 105\/206 again with leakages. The space is much more restrictive and so bogging up ends could be difficult. The fillets don’t need to look nice and so I decided to go for 105\/206\/403 – just short of peanut consistency. \u00a0I decided to go a little under peanut consistency, so that the epoxy could ‘droop’ down and fill up the gaps. I wanted a droop more than a drip so that I wouldn’t get a large mess. \u00a0After about 20 mins of curing, it’s viscosity increases sufficiently that it stops drooping.<\/p>\n

The tools<\/h3>\n

It was too hard to use really thin tube – 5 mm in diameter, despite the obvious advantages; it can easily fit down into the cavity. The problem is that the Epoxy cannot be easily delivered due to the viscosity.<\/p>\n

So I had to go for 6 mm internal diameter tube. The extra mm makes a big difference. A\u00a0problem with 6 mm tube is that I couldn’t attach the normal doweling to get it down into the cavity. It just won’t fit. 6 mm tube by itself is so snug that it somewhat deformed (squashed a little). I also wanted an arc (1\/4 circle bend) at the end to direct the epoxy into the gap between the air-frame and the fin and the only way I could do this was with 3 mm diameter copper rod that I bent into shape. I used narrow lengths of Masking Tape to bend the tube at the end to the copper rod.<\/p>\n

\"6mm<\/a>
6mm Internal diameter plastic tube on 3mm copper rod.<\/figcaption><\/figure>\n

It worked! I could then withdraw the tube and push the epoxy in and was even able to just see the epoxy coming out, so I could confirm that it was going into the right place! Very happy with this.<\/p>\n

 <\/p>\n

Preparation<\/h3>\n
\"Bench<\/a>
Bench ready for Gluing.<\/figcaption><\/figure>\n

 <\/p>\n

\"403<\/a>
403 Filler ready for use.<\/figcaption><\/figure>\n

 <\/p>\n

\"Mixing<\/a>
Mixing 403 filler into 105\/206 mix.<\/figcaption><\/figure>\n

 <\/p>\n

\"Internal<\/a>
Internal fillets done<\/figcaption><\/figure>\n

It is a bit hard to notice, but there are internal fillets done here.<\/p>\n","protected":false},"excerpt":{"rendered":"

Thought processes I decided after much internal debating to create a fillet between Fin and the air-frame. (Though it is more from the previous fillet to the air-frame). I decided to do this because the instructions for Katana 4 mention Internal fillets to the Air-frame. I know some people don’t bother with these fillets and … Continue reading Internal Fillets – Fin\/Airframe<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[9,5,15],"tags":[],"_links":{"self":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/785"}],"collection":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/comments?post=785"}],"version-history":[{"count":8,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/785\/revisions"}],"predecessor-version":[{"id":845,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/785\/revisions\/845"}],"wp:attachment":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/media?parent=785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/categories?post=785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/tags?post=785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}