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Extreme Flight 87" Yak 54 - Build & Fly

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Extreme Flight 87" Yak 54 - Build & Fly

Old 03-30-2005, 01:12 AM
  #3801  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

well, 2 pictures of a YAK at Mexico!

its a friends YAK, I have been busy and havent had the chance to fly! but I will post my pictures soon!
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Old 03-30-2005, 02:31 AM
  #3802  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Stock DA muffler owners.....Anyone regret not getting a different muffler/pipe ect.. for either of these reasons?

1. To noisy
2. Cowl mounting/cutting/fit not to your satisfaction

thanks, hopefully I can finally make a decision
Old 03-30-2005, 03:55 AM
  #3803  
coche
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

ummm...
I dont care about the noice, I dont mind 15 minutes cutting my cowl for the muffler...
I dont think that it takes longer to install the stock muffler than to install any of the pipes! it only might look a little bit more nice the pipe than the stock muffler..
but for me.. the lighter the better! and the stock muffler its the lighter option!
also the cheapest
Old 03-30-2005, 07:22 AM
  #3804  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Those are the two reasons I chose the Chip hyde muffler over stock. The only reason I considered the stock one was weight and cost...it weighs 5.5 ounces and the chip Hyde weighs over 13. However, I am semi-pleased with my finished weight...15 lbs, 8oz. that is still the low end of the weight spectrum!!! However, I do anticipate sacrificing 2-3 ounces by switching back to dubro wheels, as the Dave Browns look like they will roll right off the rim, and I still have to add my sweet graphics...
Old 03-30-2005, 08:19 AM
  #3805  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I was also tempted to get the Hyde cannister.
I chose the stock muffler because of weight savings and because engines usually act different on a pipe (the throttle curve changes and is usually less linear).
There can be problems with the connectioins on headers and pipes/cans leaking. I've heard of headers cracking/breaking.
There is some power gain with the pipe or can, but with the gain in weight I think it's a wash and I will always take the lighter plane.
I don't like the looks of the stock muffler sticking out of the cowl, but performance is more important to me and I'll deal with the looks.
I'm fortunate to fly where noise is not a big issue.

For me the simple installation of the stock muffler along with the weight savings finally made up my mind. There is always the money savings which is nice too.

It was a tough decision though....... having a nice plane with that tunnel already there begging to be used.

Jim
Old 03-30-2005, 08:50 AM
  #3806  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Well, I have the stock on order. The hyde was a serious consideration as well as the slimline wraparound. The problem with the hyde canister is you have to cut 2 inches off the header and DA says you can only cut 1 inch safely before problems might occur( throttle transition..I dont want problems) Anyhow, as far as the cowl fit I was referring to those who were having rubbing and or cutting the cowl for the muffler to clear. I would rather not have the cowl cut on the side. If it can be avoided then my decision is made.[8D] Thanks for the input, more is welcome!
Old 03-30-2005, 08:52 AM
  #3807  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: bodyworks

Those are the two reasons I chose the Chip hyde muffler over stock. The only reason I considered the stock one was weight and cost...it weighs 5.5 ounces and the chip Hyde weighs over 13. However, I am semi-pleased with my finished weight...15 lbs, 8oz. that is still the low end of the weight spectrum!!! However, I do anticipate sacrificing 2-3 ounces by switching back to dubro wheels, as the Dave Browns look like they will roll right off the rim, and I still have to add my sweet graphics...
Those BME wheels avail. yet?
Old 03-30-2005, 08:53 AM
  #3808  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: turbo4

Stock DA muffler owners.....Anyone regret not getting a different muffler/pipe ect.. for either of these reasons?

1. To noisy
2. Cowl mounting/cutting/fit not to your satisfaction


NOT AT ALL.

I dont know where the assumption comes that the stock muffler is loud. Its not. Of course the pipes and cans are going to be quieter but that doesnt make the muffler loud.
The cowl did take longer to cut on mine than Drew's but, once its done and mounted you dont have to mess with it.

My plan with this plane was to initially run it with the muffler and switch to the pipe once Drew and I had made some comparisons.
After flying the plane I couldnt see any reason for switching.




Old 03-30-2005, 09:01 AM
  #3809  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

You can get 1 2350mah and 1 4700mah + 2 miricle switches(switch-regs-charge all in one) for $149. Im curious why I hav'nt seen anyone else use this. I'm not battery/electrical savey, but it seems to me this is the same basic setup a lot are running for less $$. Unless I price it wrong the Fromeco stuff for 2 batts, 2 regs and 2 switches was gonna be $200+.





http://www.troybuiltmodels.com/Regulators.htm
http://www.troybuiltmodels.com/LiIonBatteries.htm
Old 03-30-2005, 09:07 AM
  #3810  
flat spin
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I don't know none of you are considering the Krumscheid canister. It only weighs 250g is very quiet and has a great throaty noise to it. I am turning a Mejzlik 23X8 at 6600, that's after a flight. Also they have put together a specific steel manifold for this plane and pipe combination ehat more could you ask for. I don't know if i'll get any more top end RPM as the engine runs in but 6600 with only a gallon and a bit through it ain't bad.

Someone mentioned wheels earlier. My spats have been completely destroyed, more through moveing the plane about than actual take off and landings, but anyway i ripped them off before they caused a problem. Anyway I looked at the lovely alloys which Robart are doing and thought they would like pretty good without spats, problem is they start at 4", does anyone know where i can get some similiar ones at 3.5" or do you reckon 4 would be too big, I don't want to look like i am flying a blinged up cub.
Old 03-30-2005, 09:16 AM
  #3811  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

ORIGINAL: flat spin

I don't know none of you are considering the Krumscheid canister.
Maybe because none of us over here have heard of it ??? Could you post some pics, or a link with some more info, I'm in the market for a canister, and was considering the Chip Hyde.

Which brings me to another question, I know many of you guys have researched and tested exhaust systems in depth, but it always seems to be for the DA-50, Does anyone know where I can buy a solid (no flex) question mark header for a Brison? I flew mine quite a bit yesterday, and I was skeptical to add any more weight since I've already got a heavier engine, but I think I could certainly use a couple hundred more RPM.


Edit: Ha, I guess the well known "KS" stands for Krumscheid, I never knew that !
Old 03-30-2005, 09:29 AM
  #3812  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

THe 88V From Krumscheid is brand new so there are now pictures on their site. I am not sure how it would perform on your Bison but i don't think it was specifically designed for the DA. The header which they have put together was but it should not be to hard to get the difference in measurments accounted for between the two. The key thing was getting a slight lift put in the pipe to centre the canister and doing so after the bulkhead so as to leave a gap under the firewall. The other thing was to get the right tuning length built in so that canisters exhaust comes out in front of the first former. THe header weighs 90g and is one piece steel.

The pictures below show the first header they pu together. The new one exhibits a lift and is cut to it's proper length. The one in the picture was way too long. THey really are nice to look at as well, very nice workmanship if you're into that sort of thing.
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Old 03-30-2005, 09:49 AM
  #3813  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

ORIGINAL: flat spin

The pictures below show the first header they pu together. The new one exhibits a lift and is cut to it's proper length. The one in the picture was way too long. THey really are nice to look at as well, very nice workmanship if you're into that sort of thing.
where are the pictures ?

nevermind, (been a long night) I know they weren't there at 1st
Old 03-30-2005, 10:04 AM
  #3814  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Use Kavan wheels. These are the lightest option out there and they are very nice quality. You can get them from Trybuiltmodels.com. The plastic hub wheels come in 3.5 and 4 inch and are only $10.95. The ones with the crome hubs are even better with inflatable tires, but these are more expensive and the smallest size is 4 inch. I own and use a set of both wheel types. The 3.5 inch plastic ones have a firm plastic tire and only weight 3oz for the pair! I wish you could get the chrome hub version in the smaller 3.5 size. Tires that you can adjust the pressure in are very nice. My 2.6 Extra has those.
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Old 03-30-2005, 10:09 AM
  #3815  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Mr. Spin
Any ideas on the weight savings over the KS-1060 pipe

This pipe is as big as a baseball bat...Sorry doesn't look like a cricket bat though.

ORIGINAL: flat spin

THe 88V From Krumscheid is brand new so there are now pictures on their site. I am not sure how it would perform on your Bison but i don't think it was specifically designed for the DA. The header {SNIP}
Old 03-30-2005, 10:21 AM
  #3816  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: TailTouch

Mr. Spin
Any ideas on the weight savings over the KS-1060 pipe

This pipe is as big as a baseball bat...Sorry doesn't look like a cricket bat though.

TailTouch I found a very old post of yours questioning the Brison 3.2 and a header/pipe for it. I searched here and and RC Groups, I was surprised to find hardly any info on headers for a Brison / Sachs. most posts were a dead end, I guess guys just gave up after a while
Old 03-30-2005, 11:02 AM
  #3817  
matus777
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

"I don't like the looks of the stock muffler sticking out of the cowl, but performance is more important to me and I'll deal with the looks."


Hammbone from the little i've seen the Yak fly....the std muff is visible for about 5% of the time....and that's if you concentrate real hard!
Old 03-30-2005, 11:12 AM
  #3818  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Yes,
I had a Brison 3.2 on a Lanier CAP-232. Great engine and I had planned to keep it for the Yak. Unfortunately, since I couldn't find a header or cannister for it, I had to sell it and get the DA instead.

ORIGINAL: BBriBro
TailTouch I found a very old post of yours questioning the Brison 3.2 and a header/pipe for it. I searched here and and RC Groups, I was surprised to find hardly any info on headers for a Brison / Sachs. most posts were a dead end, I guess guys just gave up after a while
Old 03-30-2005, 11:26 AM
  #3819  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I have Kreggs cockpit coming with a lite pilot.Since the photo paper sits right on the wood frame of the canopy I would like to see how you are going to attach a base plate to hold the pilot to the frame.Could you guys post some pics on how you did this.
Old 03-30-2005, 01:09 PM
  #3820  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

THanks Kregg. I really like those Robart ones though, with those on all i will need is some fluffy dice in the canopy and that will finish off the effect

The weight of the 88V is only 20g's lighter than the tuned pipe setup but the cg is much further forward and you don't have the same problems securing it. All I can say is i am very happy with the setup and if you give are going down the canister route then this and the Hyde pipe seem like the best options with a little weight saved and maybe a touch more perfomance with the KS.

I have a problem though and i know there are some pretty seasoned DA and Gas users here. My DA quites when i do inverted harriers. At first i thought it was the clunk but that moves feely with no hesitation from top to bottom. There are no leaks in the line although i was running my filler off the main feed, something which the Toni Clarke, Europes DA distributor told me i was crazy to do. The only thing i can think of it being is the pressure inside the cowl. I know the DA has a diaphram to compensate for changing pressure and perhaps it is not the same when inverted.

Any help would be appreciated. It is all very well going deadstick at a big field but i have a few flyin's comming up and i could do without this hanging over me when i'm flying.
Old 03-30-2005, 01:48 PM
  #3821  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I have a problem though and i know there are some pretty seasoned DA and Gas users here. My DA quites when i do inverted harriers. At first i thought it was the clunk but that moves feely with no hesitation from top to bottom. There are no leaks in the line although i was running my filler off the main feed, something which the Toni Clarke, Europes DA distributor told me i was crazy to do. The only thing i can think of it being is the pressure inside the cowl. I know the DA has a diaphram to compensate for changing pressure and perhaps it is not the same when inverted.

Any help would be appreciated. It is all very well going deadstick at a big field but i have a few flyin's comming up and i could do without this hanging over me when i'm flying.
I am not a seasoned anything R/C but if the problem is as you might suspect then here is a possible fix......[link]http://www.troybuiltmodels.com/CarbPlate.htm[/link]
Old 03-30-2005, 02:39 PM
  #3822  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: flat spin

I have a problem though and i know there are some pretty seasoned DA and Gas users here. My DA quites when i do inverted harriers.
It's entirely possible that you have an airflow problem such as turbo4 is suggesting, that is a rather common problem with certain engine/cowl combinations. But since you have a proven combination, (DA 50/ EF Yak) I would look elsewhere since you are the only one that has complained of that.

I'm guessing the low end mixture is too lean. Does it just plain ole quit without warning? or does it burble and stumble for a second then quit? If it's too rich it will burble and stumble along, but most spark ignition engines won't quit if they are too rich, now too lean is another story, they will quit just like a glow engine if they don't get enough fuel. I run most of my engines on the rich side (probably far more so than most) With them set on the rich side they start easier, idle better, run cooler and I don't have to worry about heating up sagging because of too lean. I never set mine for an instant transition, thats fine on the ground, (or to hear a hot piped glow engine follow your high speed throttle servo without hesitation) but I don't want to be in a torque roll at 1/2 -3/4 throttle then when I punch it to climb out , have it just sag cause it was on the ragged edge to begin with and then heated up with no airflow during the hover. Mine tends to stumble just once or twice after prolonged idling (spin down from altitude, first take off after a taxi out, etc.) and then opening the throttle fully from idle. But after it's been in the air a few minutes and gets good and hot it runs fine, so I'm not going to mess with it.

Turn the needles !! Don't be afraid, that's what they are there for ! Man I have done a fair amount of engine conversions from weedeaters, blowers, chainsaws, you name it, and nothing is more frustrating than getting a carb with a fixed jet for the high speed and epoxied sealed plug over the low speed needle. Sure it's "set from the factory" but for what elevation? what temp? It's a total compromise.

I've read about guys getting really good peak RPM figures without even touching the needles, but why? what if that really is it's absolute peak? (not just rich of peak) that is too lean, or what if it will do even better and surprise you even more? That is not saying anything about DAs ability to tune an engine, you were just lucky, that your conditions happen to be very similar to the conditions when they ran the engine at the factory. Heck some guys run drastically different sized props than the "norm" either for scale appearance or noise, or whatever, that will require a different mixture, or a tuned pipe, etc. There are so many variables, thats exaclty why we CAN adjust it.
Old 03-30-2005, 03:15 PM
  #3823  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

I appreciate that. Seems like sound advice to me. I have the top end quite rich at the moment but have leaned the bottom end out as much as it will go without hesitating. I did this to get the optimum response but i gues that will come anyway as the engine runs in, only one gallon and thre or four tanks through it so far. I richen it up go inverted nive and high and see what happens from there. Like you said the airflow issue could be correct but it seem unlikely. Should get a chance for some experimentation tomorrow.

Cheers
Old 03-30-2005, 04:09 PM
  #3824  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly


ORIGINAL: flat spin

but have leaned the bottom end out as much as it will go without hesitating. I did this to get the optimum response.
If you leaned it out, then I would say Richen it back up ! seems like they really are very close from the factory. On an airplane this light, with that much power, the high end needle won't come into play too much, just for some vertical climbs and such. So the low end and mid range have to be right, since thats where it will be running most of the time.
Old 03-30-2005, 04:21 PM
  #3825  
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Default RE: Extreme Flight 87" Yak 54 - Build & Fly

Pilot Bust Mounting w/ Cockpit Kit

This question was asked in a previous post. I have not mounted a pilot with the EF Yak and my new cockpit kit. I built the kit with a friends canopy and he has the pilot. I still need to buy one of these nice Yak's. Remember all pilot busts are different (size/shape/color), so one solution will not work for everyone. Here is how I have mounted pilots in some of my aircraft with my cockpit photo kits.

1. Install a lite ply or balsa plate/brace across & flush with the open wooden frame work of the canopy. Of course this needs to be in the rear section where the pilot will be sitting. Flush is important from the inside for clearance of the mounted photo kit and on the canopy bottom so it will not interfere with the canopy mounting to the fuse. I would make it one or two inches wide so you have plenty of edge to make the ply ends meet.
2. Install a blind 4-40 nut in the bottom of your pilot bust. Sometime I needed to cut a small piece of lite ply and glue it inside and flush with the bottom of the pilot bust. Sometimes a pilot bust even needs to be trimmed down, so they are not to tall in the aircraft.
3. Drill a 4-40 hole in the lite ply canopy brace installed in step 1.
4. Insert a 4-40 bolt with a washer up from the bottom of the canopy, through the first ply brace and into your favorite pilot bust that has a blind nut already installed. The EF Yak has ply mount parts that stick up in the rear/pilot section of the canopy. It is possible that you will need to cut holes/grooves in the bottom/back of your pilot bust. These new holes/grooves will allow the pilot bust to be located in the rear most portion of the cockpit, sit flush and line up with my torso & arms in my graphics (yes that is my body.

Then you are done and it is even all removable as needed.

Kregg

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