Q-40 Racing Discuss AMA 422 and any other variants of Quarter 40 racing

MUBU II F5D Build

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Old 02-01-2012, 09:06 AM
  #51
D.E.
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Default RE: MUBU II F5D Build

Hello All

I need a little help, I have to make an extension shaft between the gearbox and spinner for the mubu. The machinest needs a cad drawing in order to give me a price and I can barely spell cad. Could someone that can do this please pm me with your email so I can explain what I need? I will pay for your time.

Thanks
DE

P.S. Camaro is almost done (couple more months) then back to mubu project
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Old 02-01-2012, 06:32 PM
  #52
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Default RE: MUBU II F5D Build

Dave,

How long of an extension do you need? If you can sketch what you need with dimensions maybe I can help.

Mike
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Old 02-01-2012, 07:09 PM
  #53
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Default RE: MUBU II F5D Build

Thanks Mike but I think I got it. You remember the Nelson boys off road racers they are into Bonniville racers now and have all the equipment to cnc there own complete engines. Eric said he could make a few for me.

Speeking of old timers I am meeting Charlie and Bruce Brown for brekfast sunday.

DE
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Old 02-03-2012, 05:35 PM
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Default RE: MUBU II F5D Build

I just ordered a Motor?gearbox, ESC and a couple of batteries for the MUBU project....OUCH that will leave a mark, or my wife will when she sees the bill!

The Late
DE
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Old 02-06-2012, 06:15 PM
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Default RE: MUBU II F5D Build

I got in touch with an old time racer today...Joe Martin. Joe goes waaay back to when pylon was raced with deltas. He was very involved with forming F1. I hadnt talked with him since he made a short comeback try in the eighties. He only went to a couple of races and had the misfortune to midair with one of the big racers who will remain nameless but who hollered and screamed at him and Joe never came back. I got in touch with him to discuss some parts I will need to get made to make the MUBU work the way I want and he wants to take a look. Joe is a machinist whos company makes sherline micro lathes and mills, he even cnc milled his own props in the eighties....will be a great addition to the project!
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Old 04-01-2012, 12:57 PM
  #56
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Default RE: MUBU II F5D Build

Getting closer to being able to work on toy airplanes again. I have a whole stock pile of parts for the MUBU project, cant wait. This car needs to be done in 9 weeks.

DE
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Old 05-01-2012, 07:07 PM
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Default RE: MUBU II F5D Build

Looks great! An AR-6 would look really sweet with that color of red Too bad it just takes so many coats of paint to get it that way
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Old 05-31-2012, 05:43 PM
  #58
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Default RE: MUBU II F5D Build

Almost MUBU time!!!!! this weekend should be the last working on this project. Stay Tuned
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Old 06-22-2012, 10:27 AM
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Default RE: MUBU II F5D Build

Back to toy airplanes!!! I want to try to get one of these flying by the end of summer. I got some precision shaft couplers to adapt a shaft extension to my motor/gearbox. The adapters also take the 6mm output shaft to a 4mm extension to save a little weight. I need to keep total weight to 1000 grams or about 2.2 pounds. Once the set screws are tightened the extension has almost zero runout on dial indicator. It will have a ceramic bearing in a bulkhead just behind the spinner to support shaft and prop.

First step will be to make a mock up holding all the parts so I can run it up to see if it works.
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Old 06-22-2012, 04:41 PM
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Default RE: MUBU II F5D Build

Well this should work to run it up, I will epoxy bulkheads first though. I will have some cool little bearing holders that screw together through a carbon sandwich bulkhead in the fuselage though.
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Old 06-23-2012, 04:03 PM
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Default RE: MUBU II F5D Build

I got the test stand all glued up and put a dial indicator at several points along the shaft and it looks as if about 1,000th is all I could get it to wobble, at about 13,000 RPM that this 12-25 prop will be turning that is well within my expectations,,, at least we will see next weekend when I run it up.
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Old 06-27-2012, 05:44 PM
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Default RE: MUBU II F5D Build

Look at these little servos! 1/4 ounce digital and guys I have talked to say they center awesome and are extremely smooth. I donk know if I would put them in a q40 or not yet though.
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Old 06-28-2012, 08:29 AM
  #63
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Default RE: MUBU II F5D Build

those really look pretty good. 30inoz, titanium gears, .23oz, 59 bucks. I would put them in a Vtail quickie with a nelson without much hesitation. With 30inoz I would like to see 2 on the elevators.

Denis

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Old 06-28-2012, 09:31 AM
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Default RE: MUBU II F5D Build



WOW sombody is watching! Yes I will also have one on each elevator half so 4 total and still under an ounce! I really dont know how they do it they are so small.

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Old 06-28-2012, 10:49 AM
  #65
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Default RE: MUBU II F5D Build

Neat little servos for sure.. However, since I'm already adding weight with the 426 engine, I'll stay with something beefier I bet they would be great on the v-tail though.
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Old 06-28-2012, 07:23 PM
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Default RE: MUBU II F5D Build

Biggest thing I'd worry about is vibration killing them, but I don't see why they wouldn't be great in EF1's.
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Old 06-28-2012, 09:14 PM
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Default RE: MUBU II F5D Build

Always an issue. I used Hitec digital wing servos (5125s I think) in a couple of quickies. I don't think I made 40 flights before I had to replace the gears. But the metal gears in my mini Airtronics servos seem to go forever. I would sure try them. Look at all the room and weight allowance left over in a Q40 or F5D. I mean geez you could rent out the space for a news media ride along camera

Denis
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Old 06-29-2012, 03:43 AM
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Default RE: MUBU II F5D Build

Yes my main issue is weight, some testing has shown that the smaller diameter motors used in F5D dont have enough mass to deal with the large prop set ups (not enough material to soak up and deal with the heat) I am trying to make MUBU using a larger more efficient motor that weighs more but still need to end up at the 1,000 gram mark.

I have talked to a couple of guys that are using the servos in some F5D stuff that like them but who knows . I just hope they survive the crash!

They are also only 8.5mm thick so should bury in the wing with no unsitely bumps, then I will try to set up the RDS linkage to keep from having any exterior linkage. 53 second time zone here we come....I hope.
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Old 07-01-2012, 08:00 AM
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Default RE: MUBU II F5D Build

Well I ran the motor/prop with extension yesterday and all went well, smooth as silk. Now I am excited to get one flying but lots of work yet.

Starting to cover pod plug with glass and figure out servo placement so I can put little hatch covers in wing mold so I will have a nice recessed area for a nice flush hatch. I am going to run RDS linkage on servos so it will have no external linkage... hopefully.

DE
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Old 07-08-2012, 09:16 AM
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Default RE: MUBU II F5D Build

Well its hot out and the swamp cooler in the garage is working overtime but the pod plug is coming along. Looks like three molds will be made, one for the bottom cover, one to make the cover over where the wing slips into the pod and one for the main pod. Should be on to making pod molds in a couple of weeks.

I ordered some spread tow carbon that should be here on thursday and I think I will build myself a Q40 using it and some layup schedules that I have picked up on some german composite model sites. If any one is interested I will post some pics in another thread.

DE
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Old 07-08-2012, 10:59 AM
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Default RE: MUBU II F5D Build

We are ALWAYS interested in seeing a Q40 born D.E.!! count me in!
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Old 07-14-2012, 03:08 PM
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Default RE: MUBU II F5D Build

I got a present from the UPS truck, some mubus in a roll (spread tow carbon)

Plugs are painted splitter boards tomorrow. Flying in about 6 weeks.
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Old 07-22-2012, 02:26 PM
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Default RE: MUBU II F5D Build

Got the plugs done and made splitter boards then molds. The last pic is how the electrics should go in. Next weekend I will make a test pod to put parts in and see if it will come close to balance.... fingers crossed.
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Old 08-17-2012, 04:05 AM
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Default RE: MUBU II F5D Build

It has been a little while, I am now building one to fly! Here are a few pics of mock up to see if it all works together and balances. The wood plates are carbon laminates in the flyable one,,, wont be long now.

DE
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Old 09-03-2012, 04:06 AM
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Default RE: MUBU II F5D Build

I layed up the wing spars, they are made of multiple layers of 3/16 vertical grain balsa laminated with 5.7 oz spread tow carbon on 45 bias in between. The blue tape on the mock up shows spar layout.
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