Author Topic: Build threads look fun (Read 80421 times)

RC Storick · « **Reply #500 on:** February 27, 2014, 02:28:02 PM »

is it done yet?

Dave_Trible · « **Reply #501 on:** February 27, 2014, 04:34:57 PM »

Quote from: Robert Storick on February 27, 2014, 02:28:02 PM

is it done yet?

No Robert have a ways to go. Dub got his part done ahead of the rest of us but needed to so we could set some parameters for the rest. That's what you see. My ships will have two separate electronic systems on board. The 2.4 which is ready to install now but will only be used in practice this year and Briddled Thunder which we are still working on. In Tampa for a family matter this week but when I get home will start some bench testing with the .76s. My cohorts will be testing other parts and I will marry the mess in the new Desperado 105s and start testing at first good weather.

Igor Burger · « **Reply #502 on:** March 03, 2014, 08:51:47 AM »

Quote from: Dave_Trible on February 26, 2014, 03:21:55 PM

Igor... New Norden bomb site.

So here comes stuff for bombing.

Version #1 is based on my programmable timer / sequencer http://www.netax.sk/hexoft/docu/itimer_en.pdf

Picture shows whole system. Timer powered by one cell batery controlls servo connected to choke valve. Timer can be programmed to make different programs, simple full throttle for periode of time, then cut or idling before / after flight, or even landing for low throttle and again start (for semiscales) etc.

Igor Burger · « **Reply #503 on:** March 03, 2014, 08:55:19 AM »

And here are components. All can safely fit under 1 oz.

From upper left corner down:
Timer, Y cable, one cell lipo battery, nano servo, conversion cable for battery, switch.

It will need jetibox and source 5V for programming, because 3.7V is too low voltage for Jetibox.

Igor Burger · « **Reply #504 on:** March 03, 2014, 09:00:55 AM »

Version 2/

Based on active timer with accelerometer as used on electric motors. http://www.netax.sk/hexoft/docu/iAccTimer_en.pdf

It will controll RPM by servo like I wrote before. It does not have tricks with idling (at least not so far). It will need higher voltage, because of servo speed and force for accurate valve controll, so it will use 2 cell battery and 5V BEC module.

Whole system is on Picture.

Igor Burger · « **Reply #505 on:** March 03, 2014, 09:05:26 AM »

components:

Timer with accelerometer, Y cable, servo, 2 cell battery, switch, and 5V BEC - Actually I did not have small BEC, so I used small ESC, it was smaller and cheaper then dedicated BEC.

also programmable by Jetibox which could be connected between 5V sorce and timer.

Igor Burger · « **Reply #506 on:** March 03, 2014, 09:08:14 AM »

All that stuff above worked on my desk. I do not see problem with verion 1/ however I am not sure how will version 2/ work with 4-2-4 motor and that simplified carb. Well ... we will see :-)) ... Hopefully Dub knows what he does :- ))

Dave_Trible · « **Reply #507 on:** March 03, 2014, 09:13:32 AM »

Yeah. And the goofball who is going to try using it all!! Thanks Igor.

Doug Moon · « **Reply #508 on:** March 03, 2014, 09:34:24 AM »

WOW!! This is going to be interesting!!!! Cant wait to hear how it works out!!

Igor Burger · « **Reply #509 on:** March 03, 2014, 02:21:51 PM »

The timer itself work well in wind with electric motor, I flew in 16m/s wind in Bulgaria according spectators standing under anemometer. What it does witm engine reacting to longitudal acceleration (fuel pressure and probably load as a result of slowing/speeding) is question which I wrote I am not sure. But accelerometer is sensing that accelration causing those changing, so if I cannot manage it automatically, there is still way to make some compensation in algorithmus.

Basically it is exactly like we do it with electric - I set basic speed and amount of +/- RPM from that base setting. The same is doable here, just basic rpm is not set by number in timer, but needle setting instead. I do not see teoretical hole in that system, we will see what will reality do :- ))

Dave_Trible · « **Reply #510 on:** March 03, 2014, 07:28:43 PM »

Quote from: Lauri Malila on March 03, 2014, 01:52:39 PM

Question:

When the model likes to speed up, do you want to choke the venturi to slow it down or make the engine run richer?
I have a feeling that that system may work in ideal conditions but not in strong wind.
But interesting it is.

L

Lauri I'm not sure how good an answer I can give. From a practical standpoint I think it easier and 'quicker' (very important for response time in our application) to manipulate the air volume and not directly adjust fuel volume which is also a little slower response. However our gadget does passively reduce fuel simply by reducing airflow and thus draw of fuel even though we aren't doing anything with the inlet. It would not be too difficult to use this to tweak a needle setting but my thought is that would not be good for active speed control. Probably too sensitive as well without some fancy fuel metering system. Sure somebody will say it can be. Guess I'll let 'em. I've already bitten off a big bite for me now. You'd probably need to read shaft rpm range and tweak the fuel flow or needle when it fell either side of your chosen parameters. To actively or remotely do so would fall outside AMA rules. If it were an onboard programmed function then go for it. Just don't be doing two outside triangles in some strange place in the pattern. The circuit cops will figure you out!

Dave_Trible · « **Reply #511 on:** March 11, 2014, 03:33:36 PM »

.....

Curare · « **Reply #512 on:** March 11, 2014, 04:48:36 PM »

More pics!!

Dave_Trible · « **Reply #513 on:** March 11, 2014, 04:53:10 PM »

Not yet but soon. Progress is finally happening. Last of the trim colors on all three today and touching up. Will start inking tonight. Then just about three coats of clear. Not very much to rub but they feel pretty light so far.

Dave_Trible · « **Reply #514 on:** March 11, 2014, 05:51:37 PM »

wwwarbird · « **Reply #515 on:** March 11, 2014, 09:36:55 PM »

WOW!!! Looks like I should have bought some stock in 3M.

Dave_Trible · « **Reply #516 on:** March 12, 2014, 08:05:41 AM »

Quote from: wwwarbird on March 11, 2014, 09:36:55 PM

WOW!!! Looks like I should have bought some stock in 3M.

Boy no kidding Wayne. Actually a lot of Contact brand too. All the fine strip and stencils I cut from self-adhesive shelf paper. Many hours. I'm usually glad to get finished. I'm real pleased with weight so far. Looks like all three are 4-5 ounces lighter than last year's fleet. Especially impressive with the 105's which are in fact 5% larger with more area to cover and paint. The wing loading goes well down.

Derek Barry · « **Reply #517 on:** March 12, 2014, 08:45:56 AM »

The plane looks great Dave, cant wait to see it and you in Muncie!

Derek

john e. holliday · « **Reply #518 on:** March 12, 2014, 09:33:11 AM »

Test flights in Topeka when they are ready? I know the grass field may be a little rough after this past winter. Planes are looking great, be glad to see them in person.

Dave_Trible · « **Reply #519 on:** March 12, 2014, 09:34:05 AM »

Quote from: Derek Barry on March 12, 2014, 08:45:56 AM

The plane looks great Dave, cant wait to see it and you in Muncie!

Derek

Hey Bro!!!!! Thanks a bunch. You reminded me my entry forms are still laying on the table..... See ya there.

Dave_Trible · « **Reply #520 on:** March 12, 2014, 09:39:13 AM »

Quote from: john e. holliday on March 12, 2014, 09:33:11 AM

Test flights in Topeka when they are ready? I know the grass field may be a little rough after this past winter. Planes are looking great, be glad to see them in person.

Well John we'll test here. These first flight sessions are often one or two flights then go home to fix something. Hate to drive to Topeka until I'm ready to work on ME instead of the airplane. If we can get weather I'll be ready to start flight trimming in about two weeks. Will do this with limited electronics on board- maybe just the 2.4 shutoff.

john e. holliday · « **Reply #521 on:** March 12, 2014, 09:55:42 AM »

Well being fully retired I almost went out Monday, but this being not on a schedule I slept too late and it was time for picking up kids. I did get some time in the shop.

Dave_Trible · « **Reply #522 on:** March 12, 2014, 10:10:27 AM »

Quote from: john e. holliday on March 12, 2014, 09:55:42 AM

Well being fully retired I almost went out Monday, but this being not on a schedule I slept too late and it was time for picking up kids. I did get some time in the shop.

Yeah so rub it in! Excuse me, I'm getting ready for work....my employer doesn't seem to understand they are getting in the way of my flying.

john e. holliday · « **Reply #523 on:** March 12, 2014, 08:21:03 PM »

Now you know why I spent so many years putting my time in on the Midnight shift.

MarcusCordeiro · « **Reply #524 on:** March 13, 2014, 06:08:52 PM »

More pics??

Marcus

Dave_Trible · « **Reply #525 on:** March 13, 2014, 07:44:23 PM »

Quote from: MarcusCordeiro on March 13, 2014, 06:08:52 PM

More pics??

Marcus

Marcus at this point they wouldn't add much. I'm doing ink lines now and will be getting clear on over the next week. When that's done I may take them out in the daylight and get pics of all three and post. It will take a few more days after that to get new tanks made and installed. Then I still will need to figure how I'm going to mount two micro servos and the rest 'electrickery' in. Maybe I'll get some shots of that. Stand by!!!

Dave_Trible · « **Reply #526 on:** March 14, 2014, 09:34:26 AM »

Capt. Eddie 's Asteroid before clear.

RknRusty · « **Reply #527 on:** March 14, 2014, 11:29:21 PM »

Dave I'll be cherry picking info out of this thread as I build my next stunt trainer, a much simpler Brett Buck style Skyray, but there is plenty here that I can add to my knowledge set. Hope you don't mind if I have a question now and then.

First up is the rib balsa. My ribs are 3/32" and I have some average light balsa and also a beautiful sheet of contest balsa. Considering this plane could pancake at the bottom once or twice as I learn(I'm mostly past that), do you think I should use that contest wood to make the ribs, or would I be safer with a bit denser balsa?
Thanks,
Rusty

Dave_Trible · « **Reply #528 on:** March 15, 2014, 07:44:46 AM »

Hi Rusty. I'd say as long as the light wood is stiff enough to hold shape and resist warpage (and 3/32 will be) go with the lighter construction. Build for best flying and not impact. Impact will likely bust something anyway so go for better flying. Maybe that will help keep you out of the ground. My ships tend to be a bit heavier than they absolutely could be but I build to deal with a life on a rough flying field. Finding a good balance in that is hard sometimes.

RknRusty · « **Reply #529 on:** March 15, 2014, 02:18:16 PM »

Thanks Dave. That's what I sorta figured the answer would be.
Rusty

Derek Barry · « **Reply #530 on:** March 17, 2014, 06:07:49 AM »

Quote from: Dave_Trible on March 12, 2014, 09:34:05 AM

Hey Bro!!!!! Thanks a bunch. You reminded me my entry forms are still laying on the table..... See ya there.

OH CRAP! So are mine. Better get on that!

Derek

Dave_Trible · « **Reply #531 on:** March 19, 2014, 09:07:50 AM »

I thought I'd show the 2.4 ghz. shut off system going in the Asteroid. From the top; 100ma LiPo, receiver, switch, 9gr servo. The fuel line passes through a wire loop on top of the servo which is twisted shut on activation. Charges with 4 AA pen cells. Good for a whole flying session on one charge. For competition flights this season I'll pull the LiPo and simply not loop the fuel line through the servo.

Dave_Trible · « **Reply #532 on:** March 19, 2014, 09:08:21 AM »

Doug Moon · « **Reply #533 on:** March 19, 2014, 10:42:26 AM »

Your tank is completely sealed off? You cant get to it without cutting?

Dave_Trible · « **Reply #534 on:** March 19, 2014, 11:20:48 AM »

In this case that's true Doug. I install my tanks usually with one block epoxied in to hold and maybe a little silicone. No it's not an instant change but I can change it in thirty minutes. Never so far needed a 'contest change' but I still could if I had to. Once I get things set up early on its usually good to go. Most removable setups I've tried have let me down at some point but I know many have good ways to do it. In this case it got ugly making room for the switch and mounting the servo in a usable spot. Yes it would be bad news if I needed to pull this tank but I still can do it and back in the air in about an hour if I had to. The programmed system I think might be a little easier because I can mount the servo elsewhere and run a pushrod forward to the carb. I thought I would use a fuel pinch gizmo I made with the servo mounted back further but found that got hard to do with the servo way out of line with pinch device and arm movement a problem with the pipe header in the way. This would be easier with a muffler. In mock-up this looks to work but need to figure out how to get the servo reversed to get a better pinch on the line.

Dave_Trible · « **Reply #535 on:** March 19, 2014, 03:53:09 PM »

This one is ready. Two more to rig out.

john e. holliday · « **Reply #536 on:** March 19, 2014, 04:51:28 PM »

That color scheme makes the stab/elevator look big.

Dave_Trible · « **Reply #537 on:** March 21, 2014, 09:27:12 AM »

Dave_Trible · « **Reply #538 on:** March 21, 2014, 12:46:06 PM »

Well short of sealing the hinges and some bench trimming all three ships are now ready to test fly and trim. This will be done in normal fashion without electronics. Actually I'm going to do the initial work with that stuff on some older machines to get it working well and not risk the new airplanes until I'm sure the electronics are fail safe. With that I'm calling this thread complete. Thanks to all that followed along and I hope we all took something worthwhile from it. It truly WAS fun!!!! See you on the Lpad!

RknRusty · « **Reply #539 on:** March 21, 2014, 01:48:45 PM »

Your thread is a helpful reference for tips and info. Thanks.
Rusty

Dave_Trible · « **Reply #540 on:** March 21, 2014, 01:55:52 PM »

Tale of the tape:

Asteroid. 660 sq. in. 67 ounces.
RO Jett .61. Randy pipe. Mejlik props
Desperado 105. 'Gramps'. 700 sq. 69.7 oz.
RO Jett .76. Randy pipe. Brian Eather props
Desperado 105. 'Duke'. 700 sq. 70.4 oz.
RO Jett .76. Randy pipe. Brian Eather props

wwwarbird · « **Reply #541 on:** March 21, 2014, 06:43:05 PM »

And they use REAL engines!!!

Great job Dave, keep 'em coming.

john e. holliday · « **Reply #542 on:** March 22, 2014, 08:48:37 AM »

Thanks for all the info and helpful data plus the pics.

Dave_Trible · « **Reply #543 on:** April 22, 2014, 12:30:03 PM »

As epilogue I test flew Asteroid last week and am pleased with it. Some yaw to trim out and put in a new tank. This morning I test flew Desperado 'Gramps' and am very happy with it. Full pattern on flight two. Best airplane in the vertical manuevers I've ever flown. Headed back out with Desperado ' Duke' for its maiden flight. Here's Gramps on the field.

RknRusty · « **Reply #544 on:** April 22, 2014, 01:49:25 PM »

Beautiful. Thanks for the flight report and picture.
Rusty

Dave_Trible · « **Reply #545 on:** April 22, 2014, 02:15:26 PM »

Thank you Rusty! Here is Duke being made ready for its first flight. Another superb airplane!! I've never been so lucky (or blessed) to get three great airplanes in the same decade, let alone the same year. Interesting both Desperados needed the same flap tab tweak. Me thinks its to counter the torque of the .76s.

Dave_Trible · « **Reply #546 on:** April 22, 2014, 02:16:04 PM »

Dave_Trible · « **Reply #547 on:** April 22, 2014, 02:17:21 PM »

Will Hinton · « **Reply #548 on:** April 22, 2014, 02:19:54 PM »

OOOOOOOOOOOOOOOOOOOOO!! That is one sweet combination of colors!! Wow, do I like that!

Dave_Trible · « **Reply #549 on:** April 22, 2014, 03:18:05 PM »

Thank you Will!!