FT-22 Nose Repair

by Ph3nykz | November 30, 2014 | (5) Posted in How To

To start, the FT-22 is one of my favorite scratch builds that I've done. However, I'm finding that learning to fly it is a completely different story...

It never fails that while I'm out flying, and I have a good handle on how the control surfaces work, I put too much input into one of the Axises and I go nose first into the ground. The first repair I did was super straight foreward. I just traced and cut out a new nose from the leftover "template" of the speed build kit, assembled, and was flying the next day. The second repair that I made was just a quick patch up on the nose, since it didn't dissentigrate upon createring into the earth

 


This is the result of today's crash, the second repair that I did to it seemed to hold up better than I had originally thought it would. This got me thinking, since I crash so much, what can I do to make the nose of this stronger and be able to handle an impact into the ground. 

My first thought was not to replace the entire nose like I had done previously. The original design, as awesome as it is, has a couple of weak spots where the wing and the belly pan slot into the nose. You can see that I re-enforced the side of the nose with a small piece of foam on the previous repair. This time around I wanted to just cut out and replace the main damaged area. The lines shown here are where I was planning on cutting. In the end, I decided to cut to the front of the "cockpit" because that would be easier to line up with a new nose. Plus, if it didn't line up perfectly, as I'm still a beginner to scratch build, it wouldn't look horrible.

All trimmed off, ready for the new nose.

Tracing out the template for the new nose.

Here is there the added strength might come in. I noticed on the parts that I repaired previously that the sections that were hot glued down where stronger. Also, the wing spar from the original build is also made of glue and that is plenty rigid for the design. I wanted to add some strength to the nose, as stated before so I did a 50% cut diagnally along the side of the nose and filled it with hot glue. This was done to both sides.

Completely assembled nose.

As a side note: look on my arm there where the band-aid is. Remember in one of Josh and Josh's video where they recommend wing launching the prop-in-slot. Well, I didn't listen and the prop caught my arm while hand launching today. It's a pretty narly gash, but it won't need stitches. So remember, wing launch = GOOD, fuselage launch = SLICED UP ARM.

The inside of the assembled nose. 

During the assembly I used the same type of fill method that I used on the inside of the nose. Once again, hoping this will add a little extra strength to the nose. 

Finished product, now onto the hatch idea I came up with while making the repair.

For the hatch I went a little simple. I took a rectangle piece of foam, Cut it out, removed about half a centimeter of foam from each side, and too the back piece of paper off so that it will curve around the top of the cockpit. 

To latch it down, since I don't have access to magnets or anything fancy for the time being, I used packaging tape. On the front is a tape hinge, similar to that used for the elevons on the back. In the back, I covered both the cover and the back fuselage with tape, then made a simple tape latch with a doubled over piece of tape end. So far it looks like it will hold up nice.

Tomorrow is the re-maiden of this plane. Since I modified the nose to strenghten it I don't know exactly how she will perform. However, I have a theory that it won't matter once I get her up in the air and tracking. 

COMMENTS

danield on December 1, 2014
Check your CG, balance it real important on these. Soft nose, and light weight will do less damage.
Need to stop playing lawn dart with your plane. LOL.
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Ph3nykz on December 3, 2014
I noticed the first couple of times that I did crash it that I didn't properly balance my CG. On this one I took the time to balance it out properly which helped when I did crash it didn't damage it to the point where I needed to replace the nose. Eventually I plan on doing a full re-build and custom paint. This is my first actual RC, which is also being treated similarly to your first car. LoL
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alibopo on December 1, 2014
You've got to love foam board :) - nice rebuild/repair. But, wearing my engineers hat, I wonder if you could have gone down the route of making the nose weaker, and 'swappable'. Making the nose stronger means the forces from a crash will transfer through the nose into the main part of the fuselage, and now that will be more likely to suffer damage. Car designers build 'crumple zones' into the fronts of cars to absorb the shock of a crash and protect the passengers, and since you have an unfortunate habit :) of hard-nose landings, might it make more sense to use that same logic?
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Ph3nykz on December 1, 2014
That was something I thought of while working on the design for the strengthen nose. However, at 1 in the morning, it wasn't something I could wrap my brain around. I'm sure that it would work great that way, I just haven't figured it out yet.

The strengthening of the nose worked out great though. I went nose first into the ground after a nice bank and it only ripped on one of the sides next to the intake area. Everything else is still nice and sturdy.
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alibopo on December 2, 2014
It did look a good repair so it should last. I've had a few similar moments with a couple of my planes due to faulty electronics, which I finally worked out and resolved. Now I can only blame myself if I crash :) Regarding replaceable noses I saw a brilliant one in the recent "Horizon Indoor Electric Festival 2014 (Recap)" article. At (3:28) you see Peter slip the nose off the front of his VTOL. OK it was removable for a different reason, but a replaceable slide-on nose design would work great on a 'vulnerable' plane. To reduce its strength, something as simple as stripping the paper off one side of the foam board would produce a weaker section, or if you wanted that concertina 'shock absorbing effect then glue the nose piece together with intermittent glue strips instead of a complete line of glue. There's other approaches; make up a nose piece from some of that springy polythene-type foam used for some packing jobs. That would spring back into shape after a hit. I don't know where you are in your 'flying career' but I found time on a simulator helped build up my automatic 'stick responses' making everything a lot less stressed. Those virtual planes are a lot easier to repair :) Cheers.
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Ph3nykz on December 5, 2014
I remember that episode, and the removable nose seems like a better idea. I might be able to come up with something like that. I just re-supplied on foam board yesterday. I've also been doing some thinking about how to make that weak spot on the nose piece stronger, and I have a three day weekend from work. Besides running errands today, I have nothing to do but tinker and fly.

Thanks for the suggestion.
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RcDad on December 2, 2014
How about cutting a nose out of EPP? That way it will absorb the impact and go back to its original shape.
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Ph3nykz on December 5, 2014
Unfortunately, I'm cheap and EPP is a little out of my budget range for build material. However, from what I've ready and seen, EPP would be a good solution for the nose piece. Plus, I wouldn't have to worry about waterproofing it.
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alibopo on December 5, 2014
Hi, you'd be amazed where these foams turn up. Check the 'bins' of a big electricals store (ask their permission first) and you'll find lots of different foams being used as packing materials. There's also foams getting used in the construction industry that are useful - often big off-cut chunks are thrown away in construction site trash that are easily large enough to carve a nose out of. Again, get permission first to avoid folks thinking you're up to no good, some folks are very protective of their trash! I'm amazed sometimes how much gets charged for these 'specialist' foams, when the exact same foam turns up as throw-away/disposable packing material.
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FT-22 Nose Repair