jibracer13 Show full post »
Agent_J
Step 21 - Armor
Changes:
(1) I’d crashed earlier versions of this plane so often, that I got into the habit of over-building it. The thing that helped the most was the “Light Weight Structural Reinforcement for RCPlanes - Foam-Tac & Fiberglass Mesh Drywall Tape” tip by FatherandSons. Bryce’s excellent technique works great for reinforcing any part of a plane that might risk damage.

Assembly:
(1) Place the drywall tape along the part you want to reinforce, and spread a thin layer of Foam-Tac over the tape. Allow it to dry, and it will basically give you a thin layer of fiberglass bonded to the foam.
(2) The weakest parts of the plane that I’ve found are the wingtips and the nose. So those are the areas I reinforce the most. Step 21 Pic 1 - Armor Assembly #1.jpg  Step 21 Pic 2 - Armor Assembly #1.jpg  Step 21 Pic 3 - Armor Assembly #1.jpg 
Quote 0 0
Agent_J
Step 22 - Balance
Changes:
None.

Assembly:
(1) Place your preferred battery on the velcro section, then hold the Firefox at the CG point marked in Step 3. (This is why I made that mark at the CG point earlier.)
(2) If the plane is too nose heavy, move the battery back. If the plane is too tail heavy, move the battery forward.
(3) If you get to the limits of where you can move the battery and is still not balanced, add weight to the nose or tail as needed until the plane balances. On Prototype 2, which was loaded up with fiberglass reinforcement and the Super Mega Jet motor, I needed one ounce of weight at the very front of the nose for balance. But it worked well.
Step 22 Pic 1 - Balance.jpg 
Quote 0 0
Agent_J
Step 23 - Paint
Oh, this one is all you. Go nuts.

Optional:
You can trace out extra pieces for the windshield. (Lay the center piece down, trace the top section, then lay the side piece down and trace were the gap for the windshield will be. Mirror the steps for the other side.) This will give you extra foam that you can paint any color, or even put reflective tape on for more eye-catchiness. Step 23 Pic 1 - Paint Optional Windshield.jpg 
Quote 0 0
Agent_J
Step 24 - Thank you

Seriously. Thank you.

You have my gratitude you for reading all this stuff. I know it was a long time coming (over two years from when I started on the first prototype) and a lot to get through. I tried to be as accurate and as thorough as possible in explaining and showing my modifications to convert the Firefox from a mid-upper motor mount style to a pure pusher plane, so you could make the same changes if you were so inclined.

After completing the latest version, I finally remembered to check the weight. For Prototype 2, which is a fully loaded (Super Mega Jet, 50 amp ESC, fiberglass armor and paint) Firefox, the weight was 21.1 oz / 599 grams empty and 27.8 oz / 788 grams with a Turnigy 2200 battery. For Prototype 3, which I tried to make as light as possible (MicroJet V3, 25 amp ESC, no armor, no KF airfoils, and no paint), the weight was 11.4 oz / 324 grams empty and 18.7 oz / 530 grams with a Turnigy 2200 battery. With the lighter motor, I was able to skip the extra 1 oz of weight in the nose for balance. I haven’t had a chance to test the new version yet, but I’ll be sure to post here how it works.

Thanks again for your patience and the time you took to read all this. I truly appreciate it.

Jason
Agent_J
Quote 0 0
Wildthing
Well I am not sure how much time you spent on these instructions but you did a phenomenal job doing it. My only peeve was receiving 50 emails. 😃 😃  You should compress them into one file for people to download when building it., my 2 cents. 

Cheers
Jeff
Quote 1 0
Agent_J
Wildthing, thank you for the praise, and I apologize for the notifications.  I honestly didn't think of that ahead of time.  I was so tired of having this unfinished project hanging over my head that as soon as I had the last picture prepped I almost yelled out loud, "I'm posting it right now!"  (I've been working on the intro, parts listing and instructions for the last two months off and on.  Then I sorted through hundreds of pictures to find the best for each step and finally spent most of today labeling and editing everything.  The relief at being done is hard to describe.)

You did bring up an excellent point, so I made a zip file with the introduction, parts listing, instructions and pictures.  (Last post for today.  Honest.)
Quote 1 0
Wildthing
Agent_J wrote:
Wildthing, thank you for the praise, and I apologize for the notifications.  I honestly didn't think of that ahead of time.  I was so tired of having this unfinished project hanging over my head that as soon as I had the last picture prepped I almost yelled out loud, "I'm posting it right now!"  (I've been working on the intro, parts listing and instructions for the last two months off and on.  Then I sorted through hundreds of pictures to find the best for each step and finally spent most of today labeling and editing everything.  The relief at being done is hard to describe.)

You did bring up an excellent point, so I made a zip file with the introduction, parts listing, instructions and pictures.  (Last post for today.  Honest.)


You put exceptional time and effort into these instructions, if anyone fails the build it sure isn't your fault.  Super well done. 🙂 
Quote 1 0
Agent_J
As promised, I've now had some flights with Prototype 3 of the Firefox, and I couldn't be happier with how it flies.  The MicroJet V3 / 25Amp ESC combo works better than I could've hoped for when matched with the lightweight Firefox.  It takes off easily, has great performance and hasn't suffered a bit of damage over several flight despite not having any of the reinforcement that was standard on every previous version of this plane I'd built.  That means a quicker build, less expense and less weight - all things that I really enjoy.  The only thing that I wish I'd done is go with the larger elevons, but that's a minor issue.

Last year, Sidewayskiwi was asking about the KF airfoils for the Firefox.  Prototype 3 doesn't have them, and I have not been able to notice any problems in the way the plane flies.  Prototype 2 fried another Super Mega Jet motor, but once I get that replaced I hope to take both planes out and do some back to back testing.  Personally, I think the KF airfoils look awesome, but I don't think they're necessary.

Hope everyone's been enjoying the summer!

Quote 0 0