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Extreme Flight 88" Yak - Build and Fly

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Old 05-09-2011, 02:24 PM
  #10926
fireblade5437
 
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Default RE: Extreme Flight 88

Thanks for that.

Is that a combination you have tried with DLE 55?

Alan
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Old 05-10-2011, 08:51 AM
  #10927
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Default RE: Extreme Flight 88


Quote:
ORIGINAL: fireblade5437

Thanks for that.

Is that a combination you have tried with DLE 55?

Alan
I have only used the Biela 23x8 2 bladed prop on a DLE55. Nice prop, IMO. It might be above 82db, however.

Here is a Biela 2 bladed prop on a DLE55, you might contact this guy and get the db readings.

http://www.youtube.com/watch?v=spKv0hTaEY8
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Old 05-10-2011, 02:09 PM
  #10928
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Default RE: Extreme Flight 88

Thanks will try to contact him, I definitely recognise that sound! I was hoping having the MTW system on would help to reduce the noise over the standard DLE system which I am sure it does but the exhaust is not going to silence prop noise! I need to find someone who has had to find a quieter set up.

Alan
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Old 05-31-2011, 08:55 AM
  #10929
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Default RE: Extreme Flight 88

here is my yak after 6 or 7 flights.
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Old 06-06-2011, 05:25 AM
  #10930
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Default RE: Extreme Flight 88


Quote:
ORIGINAL: weezle

here is my yak after 6 or 7 flights.
Cool. Looks awesome. Had mine out last weekend.
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Old 06-06-2011, 12:56 PM
  #10931
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Default RE: Extreme Flight 88

Have over 150 flights since mid February (sunny South Florida). Love the plane. The landing gear is also great - I am sure it has saved the fuselage from several rough landings. Only limited by my thumbs. That being said, I am considering carbon fiber gear. Any thoughts or opinions would be appreciated.
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Old 06-07-2011, 04:56 AM
  #10932
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Default RE: Extreme Flight 88

It's fine as long as you don't pan cake the plane or have a rough landing. I have CF in my 110" yak. It came with the kit. One thing I like about CF is that the legs don't spread out like the alum.
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Old 06-11-2011, 03:21 AM
  #10933
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Default RE: Extreme Flight 88

well after about 20 flights, my Yak went in this morning.

wing bolt failed somehow on the third flight and the wing parted company with the rest of the model.

complete write-off unfortunately.

I've contacted the distributor in the UK about this but they don't seem willing to discuss the situation.

so disappointed. loved this plane.
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Old 06-11-2011, 04:59 AM
  #10934
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Default RE: Extreme Flight 88

That is very unusual.....I've had hundreds of flights and never had a wing bolt fail
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Old 06-13-2011, 10:29 AM
  #10935
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Default RE: Extreme Flight 88

Sorry to hear about that. Not sure what happened but you shouldn't over tighten the bolts. Just snug them up with a little muscle and that's it. Can't crank on them like metal bolts. Also can't leave them too loose or they back out. With that said, never had one break of back out on 4 EF planes. Or any other plane for that matter. It's a good idea to replace the wing bolts after a few years....but...I have an Extra on season 4 with the same bolts. So they are pretty tough.
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Old 06-13-2011, 08:42 PM
  #10936
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Default RE: Extreme Flight 88

Sorry to hear of the loss. I also lost my first EF Yak after 20 flights. Hit a tree on landing approach - plane was a total loss. Wasn't used to the size and thought it was in front of the trees when it was still behind. Bought a new one that night and now do very short approaches. By the way, I use a rubber washer (available in the plumbing dept. of Home Depot) with each wing bolt. The rubber cinches down without stressing the nylon bolt.
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Old 06-14-2011, 04:19 AM
  #10937
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Default RE: Extreme Flight 88

after closer inspection it seems part of the wing gave way instead.

Still don't know what happened to the wing bolt.

Pretty much impossible to tell what damage occured in the air and what was impact damage.

I aways do them up pinch tight. Never had this happen before.

I spoke to west london models and they were great. They're hooking me up with an extra (no yaks in stock) at cost price.

Gonna miss the yak though.
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Old 06-14-2011, 04:42 AM
  #10938
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Default RE: Extreme Flight 88

You can always get another Yak later (I would miss mine too). The Extra is awesome. You'll like it.
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Old 06-20-2011, 11:45 PM
  #10939
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Default RE: Extreme Flight 88

Have flown my new Yak for the past 3-4 weekends and noticed that my wingtube is not a tight fit thru fuse and also the supplied wingbolts lack maybe 3/16" to 1/4" of being fully threaded to the shoulder, which after a couple of days flying sent me to Lowes to pickup some thick rubber washers to make sure I wasnt bottoming out when I assembled the plane I also reinforced the fuse tube with some gorilla glue. I probably will wrap with blenderm or something to tighten wing tube itself where it goes thru fuse. I like to do vertical snaps to KE spin (still learning) and 1 1/2 snaps (also learning) and want to make sure everything stays put, believe me-I dumb thumb enough without having a plane come apart in the air.

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Old 07-10-2011, 01:02 PM
  #10940
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Default RE: Extreme Flight 88

cheers joe. I think I will have another yak at some point.

got 8 flights on the extra so far. you were right, I do like it. very much! in fact I think it is the best 50cc airframe I've ever had sticktime with.
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Old 07-14-2011, 12:36 PM
  #10941
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Default RE: Extreme Flight 88

Quick question:

Are you guys running the plastic louver that comes with the kit in your cowls? Mine is getting all chipped and not nice looking and I was wondering if removing it would cause any adverse flight characteristics or if i should just leave it.

Thanks!
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Old 07-14-2011, 01:05 PM
  #10942
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Default RE: Extreme Flight 88

I have never fitted it as i did not like the look of it!

So all my flights have been without and no problems.

Alan
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Old 07-14-2011, 06:00 PM
  #10943
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Default RE: Extreme Flight 88

I installed mine, but reinforced it with fiberglass cloth. Without the reinforcing they have been known to split or crack. A friend also flies the Yak and had trouble with overheating without the baffle.
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Old 07-14-2011, 10:33 PM
  #10944
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Default RE: Extreme Flight 88

Thats because he more than likely did not open up the cooling area down below, I cut out a 'square' hole on the bottom flat area so air goes straight through as well as original air duct facing rearwards. Without the area cut out to aid air flow the engine could overheat, my DLE 55 has performed 100% with the extra area cut out. It works!!!

Alan
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Old 07-15-2011, 10:09 AM
  #10945
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Default RE: Extreme Flight 88

You can also open the pipe tunnel on the bottom of the fuse. That's what I do. Never had my Extra or Yak over heat. I like the looks of the louver on the front of the Yak.
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Old 07-15-2011, 06:20 PM
  #10946
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Default RE: Extreme Flight 88

I have found that limiting the cowl opening to the area directly in front of the cylinder, will direct the cooling were needed. However, I also increased the rear exit opening by openning up the bottom of the first section of the pipe tunnel and installing a 45 degree baffle to direct the air down and out of the tunnel. I think my friend relied upon the square opening in the bottom of the cowl, which likely contributed to the overheating. I also think the baffle gives a finished look to the plane. But to each his own. As long as it flies good; and it does. This Yak really is a great plane - 198 flights since February 16, 2011 speaks for itself.
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Old 07-22-2011, 12:07 PM
  #10947
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Default RE: Extreme Flight 88

How can you fly 198 flights since February and call yourself "slow and steady"?
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Old 07-25-2011, 07:25 PM
  #10948
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Default RE: Extreme Flight 88

One flight at a time; in the ever sunny state of Florida.
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Old 08-23-2011, 01:56 PM
  #10949
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Default RE: Extreme Flight 88

Does anyone know what Ultra/mono coat covering color the yellow is on the yellow and black yak? I need to do some minor repairs and can't seem to find the color to match. Thanks!
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Old 02-26-2012, 07:22 AM
  #10950
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Default RE: Extreme Flight 88

Hello Everyone!

I would like to start off saying im new to this thread but have read a good bit of it. If some of these questions were covered in other threads forgive me.
Okay , this is my first gas plane period..Ef Yak 54 -88''
The Arf went together very well so far, and i am very pleased with the quality, and was happy to see unlike the instructions said mine came with wheels and axels as well.

I may ask several in particuliar questions during this but my biggest question is asking for feedback onmy approach as a whole. so here is what i have purchased so far.
1. DLE-55 " I am on a somewhat limited-budget -not really wanting to discuss engine choice"
2. Hitec 7955Tg servos for all control surfaces- Can i use stock control arms relaibly " i know i need 4'' offset arm"for pull pull
3. Throttle servo.. have not purchased how skimpy can i go here . do i need high speed for throttle response. 4. Fromeco Extreme geniune A-123 cell 2300mah battery with 2 Fromeco Badger switches< one for Rx and 1 for ignition.
5. New Radio -Hitec aurora w/ 7 channel reciever -is channels enough?
6 I also purchased plenty of hd twisted Extensions

I Do want to Simplify my Set-up as much as possible, to elminate points of failure and user error" Im so nervous setting it up, and dont want to overlook somthing.

ALL in ALL - I was looking into a 4.8 seperate battery for ignition and using my one A-123 2300mah battery for rx, or buying another A-123 and running duels on rx.. IF i were to go that route should i just use regulator for igntion Note my dle ignition specifies no more than 5 volts or damage will be done
Also read somthing interesting somewhere that there were a few guys running there ignition for DLE's off the balancing tab of A-123s
Do you guys think there is a clear cut answer for any of this .. one 2300mah for rc? duel batteries for rx? if duels should i use regulator and skip the seperate battery for ign and shar one of the 2-2300 packs going to rx .or was my original plan of seperate nicad4.8v battery on ignition and one a-123 2300 on Rx sound the most practical
Last question As far as choke- Is manual with no servo Viable? -
As far as DLE-55, stock muffler vrs pipe..Night and day difference>? or not enough to justify 300 dollars off the get go

Please Remember , Im trying to keep it simple but by no means put myself in danger by doing somthing not worth the saving a point of failure/weight/redunancy

thank you guys
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