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  #11  
Old 05-11-2014, 11:33 AM
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mike newall mike newall is offline
 
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Too slow over the top.

It can 'sit down' over the top sometimes - feels really awful.

Look at entry speeds and g loads.

There are many books out there - my favourite is by Eric Muller and Annette Carson. It's called Flight Unlimited '89.

Sometimes difficult to get hold of, but superbly written in an easy to read and understand way.

Helped me with aeros a lot.
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  #12  
Old 05-11-2014, 02:01 PM
Norman CYYJ Norman CYYJ is offline
 
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Thanks Russ, I tried various air speed entries and it still did it. I will pay more attention to the air speed and see what happens. I have being doing loops in this plane now for five years and my previous RVs and never had it happen before. I have been heavy in the past and light with none of this happening. I know what it is like to stall at the top and anywhere in between and have never experience it before. There was no feedback from the stick when it happened either. It was just like someone out there slapping the tail, maybe oil canning but the skins are all tight.
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  #13  
Old 05-11-2014, 02:14 PM
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ColoRv ColoRv is offline
 
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There isn't a lot going on back there mechanically. Take off the inspection panels and fairings and give everything a thorough lookin at. If you're satisfied all is as it should be...I would suspect oil canning or tail stall. A discussion with Vans wouldn't hurt either.
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  #14  
Old 05-11-2014, 02:21 PM
Norman CYYJ Norman CYYJ is offline
 
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I have had all the inspection panels off and the intersection fairing and no faults found. I guess it was a tail stall but have never had that happen before, but there appears to a first for everything.
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  #15  
Old 05-11-2014, 02:26 PM
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Russ McCutcheon Russ McCutcheon is offline
 
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Ok well that?s odd, sounds like you?re not new to this stuff, if you?re sure it?s not a stall buffet and it?s a new sound you better start looking close at things, tail attachments, hinges, etc. take out the baggage compartment too and make sure you don?t have a flashlight floating around back there too.
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  #16  
Old 05-11-2014, 02:53 PM
William William is offline
 
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Quote:
Originally Posted by Russ McCutcheon View Post
Ok well that?s odd, sounds like you?re not new to this stuff, if you?re sure it?s not a stall buffet and it?s a new sound you better start looking close at things, tail attachments, hinges, etc. take out the baggage compartment too and make sure you don?t have a flashlight floating around back there too.
That's exactly my thoughts. On my Rv6a right behind the baggage bulkhead is where the recommended area is to mount the elt and strobe box. Perhaps some how one of these came loose? Just thinking out load here.

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  #17  
Old 05-11-2014, 03:18 PM
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Kahuna Kahuna is offline
 
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If the shoulder straps were loose, the Hooker buckle near the rear attach point can bang on the top of the fuse of the tandems. You did not say what plane you were flying. SbS models would not demonstrate this.
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  #18  
Old 05-11-2014, 03:47 PM
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Another "out there" suggestion: Don't focus entirely on the tail. A few years ago I hit a seagull while flying a Cessna 150... The bird glanced off the top of the leading edge, on the pilot's side, about 4' out. No serious damage, but the "bang" when it hit was deafening.

I was 100% certain that the bang came from the tail of the airplane. After I landed I went over the entire tail looking for anything that would explain the bang, but couldn't find a mark. I didn't find the dent in the wing until I climbed up to fuel it.
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  #19  
Old 05-11-2014, 04:47 PM
Norman CYYJ Norman CYYJ is offline
 
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I am at a loss for what it was. I have since done a very thorough annual on the RV7. There was nothing amiss except a worn out carpet on the pilots side floor which was replaced. No extra parts except the usual dirt found anywhere. The SB was done on the tail no cracks found. No loose or broken bolts back there. I don't remember the airspeed going over the top, the entry airspeeds that were tried varied from 140kts to 160kts IAS. Went up by myself it could not be duplicated even at slower speeds. The loops just wouldn't be as pretty at the lower entry speeds. I tried stalling it going over the top at various locations and it would stall but not behave with the same noise back at the tail. Some day I will take him up again and see what happens. By the way he use to teach aero and he was at a loss also.
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  #20  
Old 05-11-2014, 07:44 PM
glenn654 glenn654 is offline
 
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Norman,

Do a search here about oilcanning in the -7, it's well covered.

I know I wouldn't like hearing that during a loop either.

Glenn Wilkinson
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