RE: 50cc QB 260 build thread

RE: 50cc QB 260 build thread
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RE: 50cc QB 260 build thread - 12/29/2006 12:56 AM

smarks

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I have a slimline showtime pro pump in my Yak 75cc and have it mixed into the throttle. I had no special formula when I mixed it in. I just have it running slow at idle then max at full throttle on a linear curve. This is with the stock 6v NiMH battery though. It seems to work great when I fly it. I set the flow rate based on how dense I want the smoke for any given throttle setting. I would think this would be the easiest way to set it up, then make small adjustments after you fly it and test the flow rate and smoke density. I'm sure there is some formula out there, but who wants to do unnecessary math?!

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RE: 50cc QB 260 build thread - 12/29/2006 11:25 PM

AussiePilot

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ok guys i have organised my extra should be here very soon now im just going to order my parts please tell me if im on the right track this will be my first gasser experience im so excited.....This list will b everything i need so tell me if i have forgtten something
DA Motor
Engine exhaust Slim smoke line pitts and smoke system ETC
Fromeco 4800mah 7.4v peerless battery AND Fromeco regulator
4.8V 1800 Ignition battery.
optical Kill switch
2 Jr Heavy duty switches
Fuel dots 1 for fuel and other for smoke.
dubro heavy duty ball links
servo extensions as per needed.
Composite rod for throttle
Spinner and Prop, Which do u guys recomend??
9 channel pcm jr reciever
hitec 5955tg all round will my lithium 4800 regulated be enought for my power house.???
and probably a small digi for throttle
will the stock servo horns be good enough or should i go with the dubro ones 1.25.??
also i have read something on here about the tail wheel being no good.?? is that true
and the clevis i have also read being no good what do u guys prefer Ball links.??
i think i have covered everything
thanks guys

< Message edited by AussiePilot -- 12/29/2006 11:26 PM >

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RE: 50cc QB 260 build thread - 12/29/2006 11:44 PM

reyn3545

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I may have missed it in your list, but if you're running a smoke system, you want 3 batteries (minimum). one for the receiver, one for the ignition, and one for the smoke pump. If you're using LiPo on the receiver/ignition batteries, you'll need voltage regulators on those two batteries also.

For the prop, a 22x8 is recommended for break-in (the first 4 or 5 gallons of gas)
For the spinner, a 3 1/2 inch 120-cut will work great, don't know if you plan on carbon or aluminum. There won't be any starter motor on the spinner, its just for looks.

Make sure you have plenty of GASOLINE rated fuel line (yellow) and you'll need some BLACK (Heat Rated) fuel line for the last few inches of smoke line where it plugs into the muffler. I think the smoke pump comes with the one-way valve, so you won't need to buy that, but you will mount that valve 2 or 3 inches from the muffler, then use the black tube for the remaining distance. The muffler would melt the yellow tube pretty fast. Its going to ruin the black tube also, but it will take a year or so of flying to do that.

Add in a few "T's" for the gas line, a couple of velcro straps to hold everything, a few hours of easy building, and you're flying before 2007!

Good Luck.

< Message edited by reyn3545 -- 12/29/2006 11:52 PM >

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RE: 50cc QB 260 build thread - 12/29/2006 11:49 PM

Mark Dennis

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The list looks good, except for the Ball Links, the plane already comes with them and they are true Dubros already so theres no need to buy more. As for the prop we used a Mejlik 23x8 after the motor was broken in. We also used a True-Turn P-51 style spinner. Also the 4800 pack will be great for powering the servos and reciever.

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RE: 50cc QB 260 build thread - 12/30/2006 12:00 AM

AussiePilot

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ok great just i read somewhere that some clevis's were no good i cant remember where they bolonged to on the plane... anyways so what size servo horns did u guys use on elevator ailerons and rudder.??
im still undecided about smoke, it will be cool but my plane will be a bit too heay for my likeings.
can u guys point me in the direction to get some carbon rod for the throttle, im down in aus and things are hard to get.

and spinner and prop...thanks guys..
and what did u think about the tail wheel i heard bad things

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RE: 50cc QB 260 build thread - 12/30/2006 1:21 AM

zope_pope

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I have around 30 flights on my stock tail wheel and its totally fine. I am using it along with the AW CF tail gear. Its a little big for the 50cc, but I have seen it on Mark's and it works nicely. Also note that the three holes on the CF gear don't match the holes on the airframe.

For prop, I like my Bolly 22x8 wood. It pulls much better than the menz, it spools up quicker than CF and it just feels very very good. The 22x8 CF bolly is too little prop as I was getting about 8300rpm on it!

Also, I am using the Pete model CF spinner 3.5". It works okay, but make sure to loctite the screws in. let us know how she turns out.

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RE: 50cc QB 260 build thread - 12/30/2006 2:52 AM

reyn3545

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I put the same smoke system in mine, optical shutoff, servos, DA50... with everything its right at 17 pounds full up. I would like it a little lighter, but I'm still very happy with the plane.

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RE: 50cc QB 260 build thread - 12/30/2006 3:28 AM

Grelker

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The clevis' are on the rudder servo horn, and yes, I used ball links in their place. You might take a look here: http://www.swbmfg.com/page5.html#wt for a real trick way to hookup the rudder pull wires to the servo. I used 1.25" swb aluminum half arms for all surfaces, except 3" full arm on the rudder and I get full 3D throws.

Tower hobbies and TBM have the composite push rod for the throttle, and TBM can provide props and a CF spinner.

I broke the axle shaft just below the tiller arm on the tailwheel on my 7th flight. AW replaced at no charge. IMHO, this was a bad axle, not the norm.

A word of warning on the Fromeco regulators: the super reliaswitch draws current even in the off position. Not good if you forget to disconnect for storage and your LiPo batt is drained. they do not like to be stored discharged.

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RE: 50cc QB 260 build thread - 12/30/2006 4:28 AM

AussiePilot

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quote:

Also note that the three holes on the CF gear don't match the holes on the airframe.

what did u do to fix this.????drill new holes.?? wa all good.??

Maybe a dumb question with the carbon Rod for the throttle what links go inside of it.?? is there metal or what im at tbm and the rods they got are hollow...or do u bye the ends for the 4-40 rod and epoxy togethor.?
i just found this can this be used.?? it has got a metal link inside though check it out and tell me what u think http://www2.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=gpmq3714&FVPROFIL=++

http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFV42&P=7 If i buy this one i wont neen anything else.?? i.e ball joints.?? it comes with the arf.???

< Message edited by AussiePilot -- 12/30/2006 6:31 AM >

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RE: 50cc QB 260 build thread - 12/30/2006 6:54 AM

zope_pope

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yep, drilled new holes in the cf. wasn't so bad though.

Definitely replace the clevises with ball links on the rudder. I landed about 4 times without rudder. not fun. Haven't had a problem since I switched.

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RE: 50cc QB 260 build thread - 12/31/2006 7:50 AM

AussiePilot

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hey guys i got myself a good deal on some hitec servo's i went to the local hobby hope and he selling the hitec digi 5985 cheap and i think im going to get myself 4 of these just want to know what u guys reckon and if there is much difference than the 5945MG

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RE: 50cc QB 260 build thread - 12/31/2006 8:17 AM

xed

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quote:

ORIGINAL: AussiePilot
hey guys i got myself a good deal on some hitec servo's i went to the local hobby hope and he selling the hitec digi 5985 cheap and i think im going to get myself 4 of these just want to know what u guys reckon and if there is much difference than the 5945MG

Theres very little to notice in difference between 5945 and 5985. I think its just a stronger case. I'm using four of them (2 aileron, 2 elevator) on my Extra, very fast and strong servos.

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RE: 50cc QB 260 build thread - 12/31/2006 4:16 PM

lazy eight

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I have both and they are vary good servo's. The 5945's you can pick up some good used ones here in the market place from time to time. The case is stronger on the newer 5985's but the 5945 I have never had one go bad yet. They are fast and at 180 in.oz or so are the perfect match for the 30% size planes. I use the 5955 on the rudder of my planes and this combo has worked vary well. IMO

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RE: 50cc QB 260 build thread - 12/31/2006 5:44 PM

zope_pope

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I am jealous. I haven't seen grass in a few weeks!

I am using a 5945 on my rudder and it seems to hold out pretty well. A 5955 would be better, but the 5945s are very fast and very strong servos.

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RE: 50cc QB 260 build thread - 12/31/2006 11:19 PM

tomswrld

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Hi, LazyEight. I hope I'm not too far off topic here, but I see that Brad ( Badbradgraphics) used your plane in his online ads. Sweet! Are they tricky to apply? I have been meaning to get a set for my 35% 260QB ,but I just haven't done it yet. Just what is that green stuff under your airplane? I just got back from plowing the pits and runways at the Chatfield Aerodrome her in Littleton, CO. for our annual New Years' Day fly. ( I.C. Carb Day ). 23+" on the level! Tom.

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RE: 50cc QB 260 build thread - 1/1/2007 1:04 AM

reyn3545

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Brad does a GREAT job with his graphics. The checkerboard is already overlaid with the "Extra 260" graphic, so no need to put one layer down and another layer in the exact right place.. its already there! There must be 100 of these planes that look exactly like LazyEight's.. including mine. The only difference was I went with a JR logo on the tail.

Most of the graphics that the manufacturers provide make you transfer the graphic to a piece of backing paper, then transfer that to the plane... Brad already has the backing paper applied to each sheet, so all you do is peel off one layer of paper and stick it to the plane. A little soap/water or Windex to the graphic to allow you to do the fine adjustments. Its very simple and looks great! His graphics also don't wrinkle when your covering starts to get loose and you have to re-tighten it.

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RE: 50cc QB 260 build thread - 1/2/2007 2:44 AM

AussiePilot

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hey im having trouble thinking about the best way to mount the da 50, what did u guys do.??Blind nuts or what??what exactly do i need.??
thanks guys if u have photo that would be great thanks a million
Steve

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RE: 50cc QB 260 build thread - 1/2/2007 2:57 AM

mikec3d

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I opted not to use smoke gear on mine. All stock gear, Da 50, Fromeco 2400/ 4800 2 regs,8611A's all @ no pilot. all up weight 15.91 lbs. no spinner yet and 22x8 Mezjlik. I can see this plane easily in the 14lb range, allthough I think it doesnt need to be, the DA50 pulled it with much authority. 3 D's like a ****.......All cf tubes,landining gear, aluminum bolts and screws, lighter regs 2400 x 2 instead of 4800 on reciever, lighten the canopy take out some wood in the fuse that is for the tuned pipe set up, BAM... 14lbs EASY.

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RE: 50cc QB 260 build thread - 1/2/2007 3:14 AM

Grelker

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The DA standoffs mount to the firewall with 1/4-20 bolts, 1" long

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RE: 50cc QB 260 build thread - 1/2/2007 4:41 AM

zope_pope

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hmm you must have a light kit. most turn out around 16.5 stock. Mine is about 15.9 but i have cf tail gear, cf tubes, taken out wood in the canopy. I wish I could have a 14 lbs airplane. At our altitude, you'd see why.

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RE: 50cc QB 260 build thread - 1/3/2007 1:07 AM

Grelker

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Please share the secret to a 14# plane! I have all the CF tubes and spinner, no wheel pants, 2 fromeco 2400's, stock muffler, Xoar prop and I'm just under 16#, just like zope.

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RE: 50cc QB 260 build thread - 1/3/2007 1:46 AM

mikec3d

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I cannot explain why all of the kits arent exactly the same weight, but mine was 15.91 on one scale and 16.17 on a digital fish scale hung from the tail wheel, the other was on its nose on the floor, not much difference. Appaerently I did get a lighter kit , or maybe somebody's scale is off a lil', maybe the ones we used, who knows for sure, but with all aluminum screws and bolts,controlhorns,lighter regulators,lighter servos,smaller fuel dot, (I used the big DA fuel dot) ALL cf gear+spinner, I would bet it can be in the 14# range , maybe 14.99, but thats still 14# either way you look at it. Are you guys sure @ your weights, Reason I'm asking is , because the cf landing gear is 6.5 oz lighter than stock, that itself is huge.

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RE: 50cc QB 260 build thread - 1/3/2007 2:43 AM

Grelker

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I just installed the CF gear tonite and I weighed it to be exactly 2 oz lighter than stock on my digital postal scale. Maybe there's part of the difference?

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RE: 50cc QB 260 build thread - 1/3/2007 6:03 AM

zope_pope

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Ha, 6.5 ozs, I wish. I was at AW about a month ago, maybe more and we weighed stock gear versus CF gear and it was only 2 oz difference. Its not that the CF isn't light, its just the stock gear is very light. Just like grelker is saying.

What servos did you go with? This could be part of it. I also think you just lucked out with a lighter kit. No two ARF's are identical in weight with identical gear. The cheap wood they use in china is very inconsistent.

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RE: 50cc QB 260 build thread - 1/3/2007 2:11 PM

bodywerks

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quote:

ORIGINAL: Grelker

Please share the secret to a 14# plane! I have all the CF tubes and spinner, no wheel pants, 2 fromeco 2400's, stock muffler, Xoar prop and I'm just under 16#, just like zope.

He's not at 14 pounds - he was expressing an opinion that the 14 pound range would be doable. I am not so sure of that, but I would definitely be the one to try!
Grelker, is that 2-2400 Fromecos total, or are you running an additional battery on the ignition? Regardless, you could drop anywhere from 3-8 ounces by going with smaller lipos all around, like dual 1050's or 1320's on the Rx and a 730-1050 on the ignition. You could drop another ounce or 4 removing some wood from the frame, shorten the down-pipe on the stock muffler and shave another ounce, go with a dependable mini or micro servo on the throttle and save another ounce - tons of areas to sve a smidge here and there...

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