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To start out, what is "attitude"?
There are two types of attitude for avoiding a tuck/tumble:
1. Pilot attitude - mental decision making which can prevent whip stalls/tuck/tumble and
2. Aircraft attitude which we will talk about here - the position of the aircraft as determined by the relationship of its axis and a reference, usually the earth's horizon.
Simply, aircraft attitude which we will cover here is the angle the aircraft is with the earth's horizon.
For those of you newbees concerned with this, you can easily avoid the details here by using your mental attitude for tuck/tumble avoidance by:
1. Flying within the manufacturers limitations,
2. Flying in milder conditions/good weather,
3 Obtaining the proper training in pitch stability.
This is just another tool for the toolbox where we will be discussing the aircraft high and low attitude avoidance specifics.
Whip stalls, which result from a very high pitch attitude (nose high) can be avoided simply by keeping this pitch attitude down. Please reference a high and low pitch attitude in the FAA Weight-Shift Control Flying Handbook Figure 2-8 for a visual of aircraft high and low pitch attitude. Additionally there Is a Whip stall/tuck/tumble sequence figure 6-23.
The goal for all of us is to not get into a situation where the pitch attitude is extremely high or low.
Generally the nose up pitch attitude will result in about the same nose down attitude. Example: If your nose up attitude gets to 45 degrees, this will result in a nose down attitude of about 45 degrees. Nose up 60 degrees, nose down 60 degrees etc....
Generally to avoid a tuck/tumble you simply keep the aircraft attitude within manufacturers limitations typically 30 to 45 degrees nose up/down.
So how do we minimize the nose up attitude to minimize the nose down attitude?
This was not covered very well in the FAA Weight-Shift Control Flying Handbook so here is an effort to provide guidance to all future trike pilots.
Tumble avoidance will be broken down here into 3 separate phases.
PHASE 1. Nose up - for one reason or another. Wind shear, pilot induced, etc.
PHASE 2. Stall and initial rotation nose down.
PHASE 3. Low pitch attitude headed for the ground.
The important phase for all of us is to know what to do in these 3 separate phases.
First the basic physics of increasing and reducing aircraft attitude. As a pilot, you have control over the bar and the throttle.
If you want a higher nose attitude you:
PUSH THE BAR OUT
GO TO FULL THROTTE
If you want a lower nose attitude:
PULL THE BAR IN
LET OFF THE THROTTLE
Let's look at each phase described above:
PHASE 1. Nose up - for one reason or another. Wind shear, pilot induced, etc.
If you feel the nose going up for one reason or another you should reduce the aircraft attitude by simultaneously:
PULLING THE BAR IN
LET OFF THE THROTTLE IF IT IS NOT ALREADY AT IDLE
This are the corrective actions to reduce the nose high attitude.
PHASE 2. Stall and initial rotation from high pitch attitude to low pitch attitude.
OK this is where timing is critical. You should/would have the bar in from the previous PHASE 1. The instant you feel a stall or the nose start to rotate down, immediately and without hesitation,
GO TO FULL THROTTLE to minimize rotation down and push out on the bar. Hopefully at this point you bring the bar to neutral and resume normal flight.
PHASE 3. Low pitch attitude headed for the ground.
If you keep rotating down, keep the bar out and full throttle until you level out and resume normal flight. If you have gained speed in the dive and the nose starts to shoot up go back to PHASE 1, pull in the bar and let off the throttle.
This is the basic procedure for preventing the tuck/tumble.
I have heard that some say to go to full throttle in a climb to avoid a tuck/tumble. This is partly true but the "timing" in PHASE 2 is the important factor that must be understood. Do not go to full throttle in a climb when the nose is going up or you will increase pitch attitude and make things worse. Only get on the throttle as you start to rotate from the high pitch attitude (nose up) to the lower pitch attitude (nose down).
I have room to transport trike(s) in enclosed trailer June 10 to June 18 between North Carolina and Tucson, AZ. If you are interested please message me on TPS.
ok, since some old 'talian guy, name of D'VINCI put out some DIY plans for a hang-glider ( old sepia videos show his 'test pilots' being hurled from the battlements to 'refine' his latest mods) (on youtube) ('those magnificent men') there have been some improvements, i.e. engines, airframes, materials etc. But, apart from 'leonardo d'mednick', with his use of fancy c.n.c. bits and other forward thinking design work, ( blatent arse-kissing here, i've offered to take away FREE a scratched or dented REV ( I LOVE THOSE PHAT TIRES!) from his junk pile, preferably yellow.) there is still MUCH to be done! there ain't been the quantam leap that we are all holding our breath and waiting to see! for instance why aren't wing ribs (batterns) pumped up and down to change wing contour? (like my varicose veins). ON-BOARD AUTOMATIC WING FOLD/EXTEND DEVICES , LIKE BIRDS, would be 'nice'. birds woulda gone extinct if they had to remove their wings and store 'em in a bag between flights. i expect even more 'odious regs' to be in force, some good some not. flying will never be as safe as 'bingo', for instance (though i did witness an old lady bash a guy with her 'marking' pen, 'cos he upset her board!) .' falling from the sky' will no longer be tolerated, but with mandatory transponders, elt's, REALLY BIG AIRBAGS, chutes or retro-rockets etc your significant other, and loan company can sleep easier! the chute, or rocket, will be hooked via satelite to a huge 'HAL' computor underground somewhere in UTAH, ( and thus safe from some 'rolly polly' arsehole from N/korea in case he tries to ruin our runways, as well as everything else!) and will deploy, from afar, if we decide to crash our, by then, 200k$ trike. saving both trike and 'tax paying', and thus FAA funding passengers. that's phase one, phase two the NTSB will arrive at your 'landing site', WITHIN MINUTES, with both refreshments and'paperwork' to sign. i'm pretty sure that bolluminum will give way to composites, both in 'chariot and wing. whitewall tires? california and florida trikes only. power ?, even though burning old fossils to turn that big fan will continue, with cat converters and any other ' gadgetry ' the ecology boys can come up with, to make it like you never burned ANYTHING, will make electric the 'norm', with the whole wing covered in solar cell fabric and 'super batteries range will be adequate. the down side of the computer hook-up is an easy way for 'big bro' to enforce regs, if your bi-annual is due, the engine won't start, till you do it. the fun-factor of trikeing will still be there, but not like it was. by 2030 i'll be 95 + and probably won't need a REV! what am i missing, cigar lighter? collision-avoidance module? cruise control? reverseable prop, for backing into the hanger? frappoccino spigot? bum warmers? cupholders? etc ................................................................freazier ballzoff
ps. my use of the term 'trike' is 'cos it's easier to type than 'FLEXIBLE WINGED AIRCRAFT' and is friendlier.
PPS. WITH 'ELECTRO-TRIKES, AND THE LATEST 7 BLADE' SCIMITAR' PROP, COATED WITH 'OWL FEATHER PAINT' THE MILITARY WILL BE USING THEM FOR 'CLANDESTINE' OPS ! BUT 'FLY-BYE' SHOOTINGS BY LUNATIC TRIKE-GANGS WILL BE ON THE INCREASE. THE PRICE OF 'PROGRESS', I SUPPOSE.
i know there's been dozens of chats on this subject but I like to know anyone who has put a Revo 12.5 meter wing on a airborne 912, I've had a arrow which I did not like at all, so I bought a new ArrowK that's with King post which is a really nice wing but I could really tell the glide really declined, so I went back to the Streak 3 which I love, I know then I should just keep it on, bad thing is I've got to lower my wing everytime and I also use the tall winter windshield which I have to remove, anyway I know there's a couple guys around Zephyrhills that went to the Revo wing on there XT912 just appreciate any input on the difference between the two,, thanks for any information Jim
yep, even though there has been much verbage expounded, at length on site regarding starting an 'empty' trike without making sure it can't 'run away' it happened, yesterday. a trike, here at my home muni field, arlington washington. channel 4 news showed an 'airplane' (quote) on top of a row of hangers. they said the pilot was injured, fortunately not badly, trying to stop it from taking off without him, but the 'plane' finished up on the roof. from the video it was obviously a n-numbered 2 seat 'naked' trike with a destroyed wing, etc. i'm not sure who the pilot is, but as stated he's not badly injured, though with that big fan spinning around he sure could have been. i personally never hit that magic 'go' button without me sitting in belted and aimed at open sky. you poor bastards that don't have electric start and HAVE to start from outside make DAMN sure that front tire is up against the QUEEN MARY or something heavy enough to prevent a 'problem'. no doubt 'big brother' will be investigating this 'incident' with all that incurs, oh well, you can take a horse to water, but you can't make him water-ski or whatever you wanted him to do. if anyone plans on starting his empty trike with full throttle PLEASE have somebody video it , it's a great 'spectator sport'. freazier ballzoff. ps. the reporter also said the hanger was not badly damaged! ( phew! that's a relief!) pps also they didn't mention the 'ulttralight' word! which woulda' pissed off the 'flex-wing' crowd!
ken and i drove the 600mls to lake alvord in south east oregon, his ford 'exploder' dragging a huge trailer with my weedhopper tied on it. when we were about twenty miles away from the lake, mostly dry, i had a brain-phart, why not fly the rest of the way! so, we assembled the ultralight and i prepared to take-off. it was by now almost dark, no moon. no sweat, i had never flown at night but how much different can it be! i had installed a huge instrument panel with every switch and dial i could find (i' was the kid that had playing cards twanging against his bike's spokes just to make noise!) also i had rigged a spotlight on top of the panel controlled by a 12volt flasher. the windshield was dusty and the prop was light colored wood. as soon as i took off from the dirt road i realized that having a mega million lumens reflected into my eyes every two seconds wasn't gonna work, so gropeing under the panel i started yanking wires till the light went out. phew! thats better. but not much, it was now really dark, out front was inpenetrable gloom. below was kens lights and a boiling dust cloud. i settled in about 100ft behind him just above the dust, doing ok till some power-lines whipped past a few feet below me. that got my attention!, i promptly backed off power and landed. ken stopped and came back demanded " what's up "? i said it's too dark, we'll have to park here till dawn. "bullshit" says ken, we've only got a few miles to go. "i'll take it". so he did. he made better time than me flying cross country rather than following the 'road'. he arrived over the lake long before me, i had planned on giving him my headlights to land by but was still a few miles away. fortunately a couple was camping out on the dry lake and hearing the 'brang-dang' of the rotax realized that somewhere up there was a snowmobile or something that needed to land so they switched their van's lights on and ken 'set her down'. ken admitted to me that my decision to land was a 'correct call'. he said that untill the couple lit up a bit of the lakebed he couldn't tell 'wet from dry'. we flew the 'piss' out of that weedhopper for three days , burnt twenty gallons of fuel, dropped an empty five gallon gas can with a home made parachute from 3k above the lakebed, all kinds of stupid stuff! ah! the good times! freazier ballzoff
yep, the 'eph' on my notepad's keyboard is rephusing to phunction, phrequently. at phirst it was phairly inphrequently, but now it's very ophten. microthopht thuckth ! uh oh, now the 'eth' is going the same way! soon i'll be 'eth' less as well as 'eph' less, very phruthtrating! phreazier ballzoph.
Looks like the time has come for me to buy a quicker wing. I need your help and input. I fly a Northwing Navajo with HKS 700e wing. Everyone in my hangar flies Contour wings.
I am trying to decide between a Profi TL vs Northwing 15 Mustang. After talking to some of you I am leaning more towards Profi TL, but then I got this email straight from Aeros (the company that manufactures Profi TL wing), I had asked the dealer a question about the suitability of Profi TL wing with my carriage and engine and this is the response he got and I quote
""We have no our own experience with the HKS engine and without it it's hard to have an opinion. We feel that this engine is too weak for a Profi TL, especially at 2500 asl.
way back in a previous century, ken and i were flying a beaver ul doing a freebie promotional photo-shoot of 'boris' and his 'bulldog' engine-out-front gyro. ken was 'taping' with this humoungous camcorder perched on his shoulder, they recorded directly to vhs cassettes, and were about the size of a fiat ( fellow geezers will remember them). i 'had the stick' out back and couldn't see much of where the sharp end was headed, so was attempting to mantain 'spatial orientation' by looking out the sides and trying to respond to kens terse instructions. "left" "right" "up" "down", etc. we had intercom but no radio, so had no idea what 'boris' would do next, and gyros are able to 'stop' in mid-air, together with the 'barge like' handling of the plane it was getting quite interesting! ken had one eye glued to the viewfinder, the other shut, and as i was a fairly low-time airplane driver i began to realize my 'mortality was at risk here! then we hit some 'moderate' burbulance. i immediately whined to ken "hey ken, it's getting bumpy". he said " do you want me to take it ?". i said, "no, i just thought you should know". he said " then shut-up and steer". so i did. ken is now a captain for alaska airlines, i don't know what became of 'boris' and his 'bulldog' , but as i now just fly a 'driver only' trike i can't whine to anyone about 'bumps' and i just have to 'shut-up and steer'. freazier ballzoff.