Alasdair Ryan Posted January 15, 2014 Posted January 15, 2014 (edited) So here is what it should look like when done.... And here is the "central" engine with a three speed gearbox. I will not bother on listing functions at this minute,but if you know me there will be some. Edited January 15, 2014 by Alasdair Ryan Quote
Lakop Posted January 15, 2014 Posted January 15, 2014 I look forward to seeing more. PS: Your images are a bit dark. H Quote
Alasdair Ryan Posted January 15, 2014 Author Posted January 15, 2014 Yes,I know I don't have my tripod ether so it will be interesting in terms of photos and videos... Fingers crossed I will have more done by tomorrow. Quote
Alasdair Ryan Posted January 16, 2014 Author Posted January 16, 2014 (edited) New pictures.... I bought a train motor from lego shop Glasgow to power my plane,it verily spins. The other out put will be for a flashing light sequencer. There is also a axillary output to be added to 2 and 3 gears.... Edited January 16, 2014 by Alasdair Ryan Quote
Gee Posted January 16, 2014 Posted January 16, 2014 Nice thinking with the train motor. Looks good. I wish I had a LEGO shop in Worcester! Quote
jorgeopesi Posted January 16, 2014 Posted January 16, 2014 Alasdair the most easy thing of this MOC will be the colors , I don´t like planes but I have to watch all MOCs and even those of Probuilders . Quote
Alasdair Ryan Posted January 16, 2014 Author Posted January 16, 2014 This if my first ever plane.... Quote
lukeandahalf Posted January 17, 2014 Posted January 17, 2014 Looks good so far! About what Gee said about wishing he had a Lego shop in Worcester, I live in Vancouver Canada and am lucky to have two Lego stores within 50 minutes train ride. Unfortunately neither store really caters to Technic. Alasdair how is the Technic selection at your local store? For instance, is there any Technic on the PaB wall? Quote
steph77 Posted January 17, 2014 Posted January 17, 2014 HI, I do Moc essentially airplanes helicopters...and such things. The first thing that comes in my mind actually looking at your work is that you do not begin with the appropriate thing. You should have a general view of your concept, a good scale for your model and most important of all a prototype of the cab frame and wings. In such a Moc, the essential difficulty will result with the structure that must goal with design (rouded shapes) and resistance (structural design) Once that's done, you will be in good position to integrate all equipement and motors. Good work! Quote
Jim Posted January 17, 2014 Posted January 17, 2014 Nice to see you building a plane Ryan! Can't wait to see all those functions Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Looks good so far! About what Gee said about wishing he had a Lego shop in Worcester, I live in Vancouver Canada and am lucky to have two Lego stores within 50 minutes train ride. Unfortunately neither store really caters to Technic. Alasdair how is the Technic selection at your local store? For instance, is there any Technic on the PaB wall? They only have the turntables on PaB,but have the new motors,new sets and mindstorms etc. HI, I do Moc essentially airplanes helicopters...and such things. The first thing that comes in my mind actually looking at your work is that you do not begin with the appropriate thing. You should have a general view of your concept, a good scale for your model and most important of all a prototype of the cab frame and wings. In such a Moc, the essential difficulty will result with the structure that must goal with design (rouded shapes) and resistance (structural design) Once that's done, you will be in good position to integrate all equipement and motors. Good work! Well now you will learn another way ,I always start with the gearbox in any build of mine I find the gearboxes are the hardest thing to build. Once I know wear both outputs will be then I will build the main frame. Nice to see you building a plane Ryan! Can't wait to see all those functions Thanks jim. Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Can any one add arrows to show me or can tell how they can add flaps during flight? If you look closely you can see the bottom of the engine cover is part of the flap section. Quote
Seasider Posted January 17, 2014 Posted January 17, 2014 Alasdair I just did a google for you. Flaps are inboard of he ailerons (as you would expect as you want the maximum turning effort from the ailerons) this image should help you http://www.mobygames.com/game/windows/aircraft-collectors-edition/screenshots/gameShotId,547776/ as it shows the flaps in the down position in this one you can see a number of supports underneath that have the 'arms' to lower the flaps http://airlinersgallery.smugmug.com/Airlines-UnitedStates-3/Airlines-United-States3-QZ/Silver-Airways/i-89LSTL3 the critical thing is to end up with a visible slot between the flap and the wing when the flap is fully deployed Hope that helps ? Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Thank you very much for the pictures,I was able to find a image that shows the flaps down.This makes the plane gain lift. But what I am unsure is how does it slow down/loss lift? In other planes the end of the engine is not covering the flaps so you can have the flap move up and down. Quote
whale2 Posted January 17, 2014 Posted January 17, 2014 These are ailerons, they are used to bank. Airliners have interceptors for slowing down/losing lift. Other aircrafts just cut on throttle or lower propeller pitch for slowing down or reduce angle of attack to lower lift (usually both) Quote
Seasider Posted January 17, 2014 Posted January 17, 2014 Ok basic flight theory 'lift' is created by making air flow faster over the top surface of an object compared to the flow of the air underneath it ... this creates lower pressure on the top surface and so 'lift' What a flap does is this ... it increase the 'curvature'(front to back) of a wing and so increases lift ... and with an increase in lift you can fly at a slower speed ... as lift is related to airspeed the flaps on the Saab are 'slotted' flaps ... this means some air will 'leak' through the hole from under the wing to on top of the wing ... this means the air will stay attached to the wing longer at large aircraft pitch angles (nose up) and so it will also stall later Does that help ? P.s. I have an aeronautical degree in terms of slowing down when its on the ground after landing this plane is likely to use number of methods 1. blade angle / feathering where the prop no longer provides thrust and in some cases rearward thrust to produce an effect like a thrust reverser on a jet engine 2. brakes on the wheels 3. flaps ... the flaps will be fully deloyed once the plane touches down ... creating lots of drag remember a prop aircraft lands at a much lower speed than a jet and so needs a lot less effort to slow Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Ok thank you,that makes thinks a little clearer. Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Actually the saab 340 is a turbo prop in the middle does this matter when slowing down? Quote
dhc6twinotter Posted January 17, 2014 Posted January 17, 2014 (edited) Actually the saab 340 is a turbo prop in the middle does this matter when slowing down? Most turbo-props have the ability to change blade pitch, which helps when slowing down. I've attached a picture with the ailerons and flaps labeled. -The ailerons are towards the tips of the wings and control the roll of the plane. They move up and down. -There are also trim tabs on each aileron, and they allow the pilots to make fine adjustments that control the level flight of the plane. They move up and down. Not really necessary on a LEGO model, unless you want to add that extra little detail. -The flaps on the Saab340 appear to be a single flap on each wing that runs beneath the engine exhaust. The flaps provide additional lift at low speeds. The Saab340 uses single-slotted flaps with offset hinges. They move down. They don't move upwards (unless being retracted of course). The Saab340 does not have spoilers. Hope that helps! Looks like an awesome project! Here is a link to some info that might help: http://www.saabgroup... ever built.pdf Edited January 17, 2014 by dhc6twinotter Quote
Alasdair Ryan Posted January 17, 2014 Author Posted January 17, 2014 Thanks very much Daniel and to the rest how help. I am rebuilding the gearbox,it stalls the motor in third. Quote
hysot Posted January 18, 2014 Posted January 18, 2014 Hey, So, flaps are used to increased lift but also to slow down because the increased the drag. They are fully extended during approach to fly safer at the approach speed. As said above you can use the pitch of the propeller to reduce the speed. Setting a fine pitch you will increase the drag and slow down. As you can see fine pitch (a good aerodynamical brake!) VS coarse pitch Then on the ground, again as said before, depending of the engine you can reverse the pitch of the propeller to slow down. It's not used in flight. If you want to make a short field landing and the airplane is not equipped with spoilers (like the saab) or reverse thrust, you can retract the flaps after touchdown to reduce the lift, increase the grip of the tires and increase the efficiency of the brakes. Quote
Alasdair Ryan Posted January 26, 2014 Author Posted January 26, 2014 Pro builder coming through.... Here is the new three speed gearbox with another gearbox controlling each side. I should now pick up speed,as it should be plain sailing all the way to the end. Sorry about the picture quality. Quote
Gee Posted January 26, 2014 Posted January 26, 2014 Never ceases to amaze me how people can come up with these things. I struggle just getting direct drive to an axle! Good stuff, lookin' forward to more progress! Quote
torso Posted January 27, 2014 Posted January 27, 2014 'lift' is created by making air flow faster over the top surface of an object compared to the flow of the air underneath it ... this creates lower pressure on the top surface and so 'lift' That seems to be the popular misconception. Here is a better explanation: http://www.allstar.f.../airflylvl3.htm Quote
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