RE: (Something Fast?) Delta Build Thread

RE: (Something Fast?) Delta Build Thread
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RE: (Something Fast?) Delta Build Thread - 1/5/2008 12:30:14 PM

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From: mayfield, KY, USA
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both of those look great!!! i hope to have the header and pipe this coming week for my YS 45 so i need to get to work and finish mine up..
speedy did you make the engine cowling?

randy racer

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 3:13:05 PM

Speedy-Gonzales

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From: Bryan, OH, USA
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ChuckL, I asked and you gave me permission to use your color scheme on post #196. Remember? It is so bright I have to throw a towel over it so I can sleep at night. I keep thinking I left the light on in my model room if I dont. How does yours fly. Have You had a chance to put more time on it? Have you put the hammer down yet? Don't worry. I think there is enough airspace between us as to not get mixed up on who is who unless we both show up at the same fly-in! Speedy

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 4:52:58 PM

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From: Tulsa, OK, USA
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I would like to see the 60LX and the Q40 powered Demons up at the same time.

You could tell them apart from the different wing tips. I better get busy a put a real engine on one of mine. First I am trying to find the right prop to maintain 140 mph in level flight with a TT Pro 46. Not much good flying weather this time of the year.

Speedy, Your plane is a work of art. I know you spent some time on that cowl and it looks great.

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 5:44:08 PM

ChuckL

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From: Alanson, MI, USA
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Hey Speedy I remember I was just kidding it looks great. First two flights were the only flights that were not at full throttle from launch to flame out. It flies great, glides great launch is a non event.

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 8:00:12 PM

Speedy-Gonzales

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Thanks ChuckL. I didn't want to have you tear all that pretty covering off YOUR plane. LOL! My only concern is the initial launch with the 7.4 x 8 prop but the light weight should make it come out of the hole pretty good. I would be a liar if I said I won't be a tad nervous on the first flight. I will probably get a few good practice flights with my Shrike first. I like to get into a good rhythm in a "split-S" pattern. The down line should be awesome with the Nelson. Engine tach's 24K+ with this prop static. 24 times 8 is 192 for SLF! Speedy

< Message edited by Speedy-Gonzales -- 1/5/2008 8:04:49 PM >

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 9:24:48 PM

Speedy-Gonzales

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Randy Racer, Yes I made the cowling. There is the main upper half and a lower belly half that meet at the LE. I spent more time designing,engineering, and building the cowl than the rest of the airframe. Here are some pics of the process. I made a balsa plug then applied 2 ounce glass cloth and AeroPoxy laminating resin. Blow up a big balloon several times to get it streached out and then let air out while pushing balloon over plug. Kinda like putting on a.... well you figure it out! This gives outside surface a smooth surface. The lower flange was made seperately and then fitted and glued with a bead JB Weld to the main piece. Making glass cowls from scratch is not that hard but requires a lot of patience. Many, many, steps to completion. AeroPoxy is a brand name and is available commercially for laminating full size aircraft parts. It is by far the best laminating resin I have used. Let me know if you need info or just type it in your online search box. Hope this helps. Speedy

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< Message edited by Speedy-Gonzales -- 1/5/2008 10:14:47 PM >

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 9:36:17 PM

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thanks speedy that looks great, but i don't think i will do that much work on this delta. maybe the next one. how much speed do you thing it gives you?
randy

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 10:08:46 PM

Speedy-Gonzales

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Well..there is actually no way of knowing that but it looks like it is faster just sitting still. I figured with the Nelson Q40 and the added drag of the side exhaust and muffler it couldn't hurt anything. ChuckL with his rear exhaust motor has less frontal area. I'm placing my focus on the Nelson's monstrous horsepower, small prop disc area, and ultra RPM's. A lot of guys forget to consider the disc area of the prop. Theoretically this does account for drag. I left the carb external from the cowling because the carb is so huge and I like having the carb exposed for tuning. I would have incorporated the intake into the cowl had I used the straight venturi but I wanted a throttle. I do not believe it will hinder the performance plus I got the bonus of great cosmetics!

Speedy

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RE: (Something Fast?) Delta Build Thread - 1/5/2008 10:46:44 PM

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quote:

ORIGINAL: randy racer

how much speed do you thing it gives you?
randy

Back in the late 20's NACA found that a properly cowled engine alone could increase the speed of an aircraft by about 12%. Our single cylinder models may not benefit that much but I would bet that Speedy's cowl will add at least 10 mph. Besides that, like he said, it looks fast.

There are a lot of do and don't rules when building a cowl. If you or anyone else is interested I have a how to article on it written by a very well known person.

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 12:57:24 AM

Speedy-Gonzales

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Mike, I hear you are trying to get 140 out of a TT Pro 46. I can tell you how to acomplish this easily. Use an Ultrathrust muffler and an APC 8.5 x 7 prop. 25% nitro and a medium to cold plug. I have been talking with guys wanting a little more speed out of their 424 Sport Quickee's. The .46 is not legal for 424 but you are not going to be racing with the Demon anyways. The TT Pro is also noted for rear bearing failure when pushed hard. You might want to consider an upgrade for both bearings. I have seen a TT Pro 40 completely shreaded due to bearing failure. Another superb engine that will really suprise you is the older Supertigre S40 ABC. The S series is no longer made but can still be found if you look for it. It has the barstock head, not cast like the new GS40. I have a Supertigre S40 on a stock Lanier Predator II with the Ultrathrust muffler and it turns 18,700 rpm static with a 8.5 x 7 APC pylon prop. Probably unloads another 1000+ in the air. Some engines just seem to have more power than others. The TT Pro is a good engine but the ST S40 will make your Demon hit 140 with ease. You can take that to the bank! One final note and I'm sure I will get some feedback on this comment. Don't even bother with the Magnum .46. It is a turd. I know this from self experience. Supertigre is a good economical choice. Even the newer GS 45 ABC. If you want to move up to quality...buy a Nelson or a Jett. The old K/B 6.5 and 7.5cc RE engines are an excellent choice but don't buy used. Nobody sells a great running racing engine. The O.S. 45 VR DF is another one. I am not an expert but I have been around the block a few times. You learn more from losing a race than from winning. An expert is anyone that has crashed more than 10 times!

Speedy

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 1:17:47 AM

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I know it would be easy to break 140 mph with other engines or tuned exhaust but 140 mph with a stock $89 engine would be good advertising. I am hoping that the 8.5 x 9 will get me there in level flight. Like in your neck of the woods, Cold or windy is the rule around here this time of the year.

As far a bearings in the TT engines, we do not seem to have many problems with them around here and there are many being used. I will push it hard until it breaks and then get another engine.

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 1:27:34 AM

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what do you guys know about the YS 45 2 stroke? i am going to use a mac's header and tuned pipe, is that good? and what prop should i use?

orange and white must be great colors for deltas

rr

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 1:39:27 AM

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Randy,
I almost posted a picture of your "Outlaw Hunter" in the Outlaw thread just for grins but decided to keep the peace.

If know one answers you about your engine you might try a YS45 thread for more visibility. I know Razor-RCU had one and I would think Flyboy Dave would have good info for you.

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 2:12:39 AM

Speedy-Gonzales

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From: Bryan, OH, USA
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8.5 x 9 is a heavy load for a generic .46 engine. You must also consider porting and timing issues with the $89 specials. There are two distinguishable issues with 2 stroke engines. Porting and timing. Once you reach the maximun breathing capability of the internal design of any particular engine you have no where left to go. You can change props,fuel,and glowplugs, to no avail. You are topped out with that design. Once you reach the point where no furter enhancment can be obtained you have two options. Modify porting and timing or upgrade to an engine of higher specification. This is where some guys get off on the wrong track and think by buying an engine of larger dsiplacement they will go faster. Bigger is not necessarily faster. "Speed Soup" consists of three basic ingredients...horsepower,RPM, and propeller pitch. There is a fourth ingredient. The pot you cook it in....airframe limitations i.e. drag or frontal area. This is my recipe. It has not lied to me yet. Speedy

< Message edited by Speedy-Gonzales -- 1/6/2008 9:51:23 PM >

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RE: (Something Fast?) Delta Build Thread - 1/6/2008 2:52:36 AM

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From: mather, CA, USA
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Randy

After break-in, On a tuned pipe, the YS 45 likes the APC 9X9 prop at around 16,300 on 15%. Add 1000rpm to what you get on 30% nitro (Dang these thing likes 30%). Use a OS #8 plug.
With the engine on a test stand, break it in with at wide open rich two stroke run for three tanks of 15% nitro and at least 20%oil. 18% oil after that is fine and faster. Let it cool down after those runs. This engine will lean out in the air, so launch it a bit rich and work it leaner after a few flights. Use a Hayes Fuel tank.
Have fun!

< Message edited by freakingfast -- 1/6/2008 2:57:11 AM >

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