A spiral dive needs two elements to occur: a nose-down attitude, and roll. Either alone won't do it, and on most trikes it takes a bit of conscious seeking to get the combination right in order to initate a full-blown spiral dive. Usually when the nose is down and the speed is increasing, a point is reached where the pitch stability of the wing raises the nose (the first phase of a phugoid oscillation). If the right amount of roll is happening concurrently, however, this does not occur because the wing is side-slipping, and the roll-yaw coupling of the wing initiates a yaw in the direction of the dropped wing as the wing weathervanes into the relative wind, which is not parallel to the keel but moves slightly across the wing. This yaw is occuring as the nose is low, and because it occurs in the same plane as the span of the wing the yaw acts to further lower the nose. The yaw creates more roll, and this roll is potentially exacerbated by the extra drag of the lowering wing which is operating at a higher angle of attack. An important point here is that the yaw is playing catch-up to the rolling wing, and because the nose started low and the wing has rolled, the plane of the yaw has a downwards component... which further drops the nose... creating more roll... creating more yaw, in the direction of the lower wing... dropping the nose further, creating more speed... creating more g... and more roll... more yaw.... lowering the nose.... more g etc. Depending on the spiral stability of the wing, in the absence of pilot input either a steady state is reached (neutral spiral stability), or the process continues until things go pop (spiral instability).
An important point is that in the early stages the pilot may be able to correct the situation by adding throttle/ pitching up, turning the whole shebang into a coordinated turn. By the time things have fully developed, this response will bust the trike. Pitching up increases g at a time when the wing has enough already and has energy to burn. The correct response is to break the feedback between roll and yaw - and as yaw control is not a feature of trikes, the thing to do is to roll the wing level. This may be easier if the flow of relative wind is encouraged to go more parallel to the keel in the first place - by pulling in on the bar - but usually this isn't necessary. Having rolled the wings level, you're left with dealing with a highly energised wing in a nose-down attitude. The wing will want to raise its nose; it's up to you to control the rate at which this happens.
Other factors such as g due to g do happen but aren't really part of the mechanics of a spiral dive per se - in other words, the spiral dive would occur regardless.
I'd like to add my voice to those who say that a spiral dive in itself isn't a dangerous manoeuvre. Like many aspects of flying, it just takes a little deliberate pilotage. The attitude, speed and g's may be disconcerting to some, but the recovery isn't nearly as challenging in terms of pilot skill required as, say, landing. Technically what's needed is to break the coupling between roll and yaw. Yaw control isn't an option, so go for roll. In practise, roll may be aided by pulling in. Stay off the throttle; there's too much energy in the system already. Easy enough... ?
Please contribute to this discussion. All views are welcome.
I just waned to let all of my friends know that I am Idaho dealer for a new trike Aerotryk ss, which is a 103 trike offered by Ace Trikes USA. This trike has many features that make it very special. First is the price. The complete trike is 12,999 (more info on my website www.skyboundsports.com ).
STANDARD SPECIFICATIONS & FEATURES Picture STANDARD features on all of our ready- to-fly AEROTRYK ss aircraft: -aircraft-grade, anodized aluminum frame and hardware - Rugged wire-braced structural tube landing gear for increased off-field capability and durability - Impressive pilot/gear weight capacity of 255LBS, even with a full fuel tank! - In-Flight Trimmer system (FAR 103 Weight shift trike EXCLUSIVE) - Large tires and aluminum alloy wheels, no plastic junk and wheel barrow tires! - Dual throttle setup… One foot operated and one hand operated “cruise control” - 4 point seat belt with aero style release buckle - One of the most comfortable seats in its' class - Large integrated Side bags for carrying gear and supplies (Approx. 22 liters of storage) - ULTRA PROP brand composite 3 blade propeller or optional GSC 2 blade wood prop - The 34HP Simonini MINI 3 engine - High quality front brakes - 5 Gallon fuel tank, with external filler neck. Perfect size for XC flying - ELECTRIC START - Instruments: CHT, EGT, Tach/hour meter, HALL airspeed indicator - High performance, yet docile wing with a wide speed range for slow flying and faster XC flying - High quality, fully machined hang block with oversized fasteners and safety strap - Folding mast and main frame tube for easy rigging, disassembly, and portability - Adjustable length front fork mount for different size pilots (4" adjustability) - Simple, yet sophisticated modern design and colors Where else can you get that many high quality parts, standard features, and performance for $12,999?* … Oh and did we mention immediate availability?** No, it’s not a dream… it’s what’s new in personal aviation. CONFIGURATION AND SHIPPING OPTIONS: PLEASE NOTE... ALL LISTED PRICES ARE IN U.S. DOLLARS AND DO NOT INCLUDE SHIPPING OR TAXES (If applicable) - STANDARD RTF AEROTRYK ss ... $12,999.00 (Nationwide, NO-HAGGLE price) - TRIKE AND WING ONLY, NO ENGINE ... $9,299.00 -
For more information visit my web site www.skyboundsports.com
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It looks like they want to restrict S-LSA to E-LSA and electric aircraft/trikes to single seat operation. I have not had time to look at the details but please look at, figure out and help us provide some response.
The next step will be to allow only single seat operations in E-LSA trikes. Yikes. This needs to be stopped.
I heard 40% of
mechanical problems in GA aircrafts are related to the fuel
management. Fuel starvation, vapor lock, pump malfunction,
filtration issue, etc.
I started flying over some unforgiven terrains since few years ago. I didn't have any safe landing spots in many flights and BRS is only the option to go down.
I recently added the following to my trike for the additional safety. I learned some of these during upgrading my engine. Rotax recommends these measures in the engine installation manual. My trike is 7 years old and didn't have any of these additional safety functions.
1. Fuel return line for the prevention of vapor lock.
2. Ancillary electric fuel pump.
In addition to the above, I'm planing to do the flowing soon.
3. Fire sleeves on the fuel lines. (especially the lines directly over the engine)
4. Fuel pressure sender and gauge.
How do you manage your fuel related issues ? Are there any additional measures I should take into consideration ?
I have a customer interested in buying my 19 meter wing (the deal is not final yet) but we have figured out shipping options. Now the bigger problem is packing the wing. I don't want to do the crate. And I was thinking of using a PVC sewer pipe but when I search online they are not cheap either. They can cost anywhere between 30-70 dollars a foot. Buyer is paying for shipping material cost but I want to keep the buyers cost as less as possible. Any ideas where I can get these pipes for cheap or any other ideas what to use to pack the wing?
P.S. If anyone is driving from Idaho to Miami and won't mind carrying this wing, please let me know. I will pay you a fair price for it.
I ran my 582 at max RPM 6500 50 climb, 60 MPH cruise 2 people 70 cruise just me.
Figure only 55 HP on a 582 here at 5000 density altitude with a Aeros 14.5 Meter wing or 55hp/14.5 sq meter or 3.8 hp/square meter. This was in a pretty heavy trike and I feel at the lower edge of power for this sized wing. This would be 200 to 300 FPM climb fully loaded climbing at 50 MPH.
If you are at sea level, and running running a 582 trying to downsize to a 12.5 meter wing it would be 65HP/12.4 or 5.2 HP/sq meter so this should be in range.
We also have an 80 hp or 68 hp at this altitude waiting to test on a 12.5 meter wing = 5.5 HP/meter sq which we feel should be OK
Any other thoughts and actual experience about minimum sized wing for different engines will be helpful. It will help me draw up some ules of thumb on this subject
Apollo Trikes and Apollo gyroplane will be displayed at Paradise City (LP area) at Sun N' Fun on place# 12 through SilverLight Aviation (http://www.silverlightaviation.com). Delta Jet II will debut with the Cheval topless wing. Also see Apollo Gyro AG-1.
Come see us and take advantage of the specials.
Apollo Delta Jet-II Trike nicely loaded with tall windshield, 3/4 engine enclosure, nice roomy seats and headroom for back seat (built on the proven Monsoon structure), adjustable foot pedals and adjustable instructor pedals, MGL Extreme color EFIS, iPad Mini with LifeProof for navigation (buy your own app for nav), Radio, Flycom Helmet Set, Mode C Transponder, electric trim, 3-wheel hydraulic brakes and parking brake, 3-blade composite propeller, Cheval topless wing, Aveo Nav/Pos/Strobe LED lights and factory built as SLSA:
$67,350.00 (April and May delivery slots available for in stock items)
Options such as BRS and instructor set also available at reasonable cost.
Gyroplane: AG-1 with 912ULS with standard instruments and radio kit form:
Gyroplane: AG-1 with 914UL with standard instruments and radio kit form:
Builder's Assist available at extra cost.
Please see the LP area (Paradise City) map for reference below.
Planning to do a Triker's party on Thursday evening and will release details soon.
out The New Delta Jet 2 manufactured by SilverLight Aviation with
sales and service by Papa Tango Aviation.
The SilverLight Aviation Delta Jet 2 will be on display at Sun N
Fun, April 1-6 in Lakeland, Florida.