Tomo

best glide will vary.

Don't want to start an argument, but until you know your aircraft back to front (like Bob Hoover did) stick to the book. Yes it mayen't be exact, but it is there to get you out of trouble.

Exactly Tomo...so the mantra 65kts 65kts 65kts is basically useless. Darky said it's the best glide for a reason...Well that is BS. Best glide will vary in different configurations and weights. I suggest that it's a 'Ballpark' figure at best and easy to remember when in the poo!

65kts is the published best glide for Jabiru (most of their models I believe). Best angle of climb is 68kts in the J120.

Sticking to it is the best bet of the day. Adding a few kts for a buffer zone, may or may not increase your descent rate. Another reason to understand and fully work with your aircraft.

Different aircraft weights DO make a lot of difference in how it performs, but when the factory alocates a speed best 'overall' it really means that.

Making the glide between 65-70kts is personal choice. I have checked it and there is no significant difference between them ON the particular aircraft I fly.

Not sure if you have, but if you ever get the chance to fly a low performace, high drag aircraft you'll understand exactly what all this is about.

Just looked up the CAS vs IAS on the J120 I fly.

65kts IAS is 62kts CAS, and 70kts IAS is 67kts CAS. Possibly why I don't see any significant difference in descent rate at either speed.

Just for interest, the more weight in your aircraft the faster you'll glide vs less weight, in the same aircraft for the same time. Hence ballast in performance gliders.

Thanks everyone! :big_grin:

80kts: From memory I think it was one of my brothers, a Sony DSC-H5.

I enjoy playing around with editing when I can... time consuming, but fun as well!

Post your pride and joy here, Ensure you have a full size high quality version to email, if you win. Judging dates to be advised.

Each winner will have their photo credits added somewhere on the calender.

Have fun!

Fantastico!

Ok, so we need to get started with some pictures hey...

...not here though, we'll start a new thread for that. And that is Here

My cousin is in the Airforce, he went through some pretty tuff tests to get there I can tell you. They need you to be absolutely perfect In Health!!

He also did a Degree in Engineering at ADFA first. He then got trained up at Tamworth in the CT's or whatever. Then gets sent around the country doing all sorts. Was dog fight practicing in a Hawk the other day at Tindal.... Jealous!!!! :big_grin:

Sorry, but that is about as much as I know - where there's a will there's a way. So we'll soon be reading about you CK!

Good to see you were up catching early worms this morning Tomo :-). Even the birds slept in around here as the weather was nothing short of foul. Gale force winds and driving, freezing rain.I'm very envious that you've been for a flight in a Lightning. Perhaps, rather than my hijacking this thread, you could start a new thread and give us one of your entertaining essays on the Lightning. What it's like to take off & land and what it's like in flight. Be very interesting on a comparison with your experience with the the Cheetah Sierra 100.

I can tell you though, it handles no where near the Sierra, the Lightning's tail isn't big enough, so if you lift it off at the wrong speed, you have no elevator control, and you'll do a wheelie and stall. Same with landing, bring it down just off the deck and wait for it to land, any sooner than when it is ready is painful for all concerned, and too late you loose elevator effectivness.

I should be around it in the next couple weeks, so I'll see what I can do.

I'm sorry Tomo, but I definitely disagree with that. You should aim for the exact best glide speed - 65kts (in this case, appropriate to aircraft of course). It's clearly marked on the ASI, it's not like you need to guess. The best glide speed is clearly 65kts for a reason - so fly at 65kts. You won't get the same glide distance at 'a few knots extra' and in this situation you want every bit of distance you can get.

You make a very good point, and yes, 65kts is best glide, so 65kts it is. But are you going to maintain a solid 65kts?? Jabiru's still glide just as good at 70 as they do 65, check the VSI next time, and it is just a little buffer, but of course if you can maintain exact 65kts, and no less. I'd deffinetly do it.

Something else to consider that is also writen in the Jab POH is that a slightly higher speed may give better distance over the ground if gliding into wind; a slightly slower speed if gliding downwind. Hence 65-70kts

Another little trick to electric flaps on Jab, particularly the J230 is you just give it a flick of flap... a really little amount in other words, and it'll increase your glide.

Do you have the hatches closed/locked on landing Tomo?

Hope that helps.

Justin, As Adam said...

Also, (not sure if you've ever turned your engine off in an aircraft yet to see) but when you do, it will still spin for quite a bit, until you get to a slow enough speed to stop it windmilling. Ok, so if it's still spinning - basically it's already in restart mod. One of the reasons you cycle the throttle and mixture, and check your fuel, and mag's...

The only time an engine will stop suddenly (lock up), will most likely indicate a serious internal injury in the engine, and no amount of trying to start will work.

- The formula for working out the distance? Was shown a great one today, way easier than what I used to do - 1/2 IAS x Time(in seconds) = Length in meters.

This one

 

100 kts in 1 hr is 100 Nm

 

I got 50 x 3600 = 180,000

 

Ok so you travel at 60kts for 1minute = 1.852 Klm, 1852 meters.

Use the formula, 30 x 60 = 1800 meters.

OK, I misunderstood - good formula

And unless I was 100% sure it was going to be a walk in the park type landing I'd activate my PLB

=========

What about trying a precautionary search and landing:

3 Circuits, 500ft, 200ft, 20ft, climbing back to 1000ft as you go around.

Time the first pass to obtain a rough length, to see if you'd make it in safely. (obviously at a set speed to do that!!) 1/2 the speed, multiply it by the time in seconds, will give you a pretty close length in meters.

Check, climb out/approach area's while you do it, major obstacles.

200ft, thoroughly check area for powerlines fence posts etc...

20ft check surface, muddy, rocky, grassy, and getting a general picture of what's what.

Depending on the reason for it, you could also do a Pan Pan call with intentions, so others know you're out there.

Land.

Hows that?

Come again on the distance calculation Tomo?????

Well, either we're all scared to say, or everyone has forgotten how to do it!

So, I'll give it ago.......

PFL -

Rough running ~ CMF - Carbyheat, Mixture (if applicable) Fuel - tap on, Pump-on, Check contents.

Engine failure ~ 1st step - don't forget to Aviate!

Get best glide and trim for it, do nothing until you have the best rate settled and trimmed... (best glide in your aircraft) Maybe just a few knots extra for the fudge factor, and the fact that you'll most likely always try and stretch the glide!! (Best glide 65kts in most Jabs - I practice 70kts for engine out)

So Aviate has been looked after, now

Navigate ~ Choose a Road, Paddock or path of least resistance (the softest looking trees as my instructor says! and don't land in bunya pines, they're too spikey!) into wind if possible, and look at the overshoot/undershoot options.

Visualise its "Circuit" try and choose a land feature at the point where you would turn an early base, and get yourself at the point, at 1000ft AGL. (you should have a rough estimate of ground elevation whilst flight planning)

The easiest way is to fly downwind, assessing the height, using the wingstrut as a guide for distance out. (Assuming you have wing strut)

{How accurate is your height estimation? Give it a go one day and check yourself with the Altimeter. (It's a good fun afternoon flight game!!) }

Enroute ~ FCMOST Check: Fuel, CarbHeat, Mixture, Oil, Switches, Throttle (dependent on what you were taught)

Mayday call ~ Mayday Mayday Mayday "Aircraft xxxx" 20 miles South east of ### @ Height, partial/full engine/structual etc.. failure, 2 POB (persons on board), conducting forced landing on/in (road/paddock, trees etc...)

You don't want to cluter the call up, but giving useful and relevant information will certainly help a lot. ~

Assessing your height and distance out as you turn base, try an Aim to touch down 1/3rd of the way into the runway, Use flap and/or a slidslip to bring the touchdown point closer to the fence. Don't use flap until you're sure you need to!

On final, Brief the Pax for the touchdown, sharp objects out of pockets, hatches and harnesses secure. (if applicable)

Short final, fuel tap OFF, Master off, Mags both off.

Don't stretch the glide, conduct a normal flare landing into whatever you are landing on, try and keep it just off the ground for as long as possible, and hopefully the outcome is successful.

Hows that?

I passed! Woo!Don't need to wear my specs to fly or anything :) Left eye is 6/5 (I think), Right is 6/9, overall is 6/5 (i think?). Anyway, he said it was fine so it's all good.

 

Now I just need to pay the fee to Crasha

.......look rather hard. As they are few in number, and.........

Good one David, Welcome along. :thumb_up:

I enjoy flying a J120 as well, a very nice little machine.

Hi Tomo am I imagining it or is your calender not got the 1st on it. The original one looks great though. Sue

If we get interest for 25 or more, we'll get a bulk discount.

Incidentally, I noticed the Arion Lightning with a similar (low) Turbulence Penetration Speed and a Vne of 180 knots. So, perhaps not that unusual.

Sorry Pete, I have that effect on fish, the only fish I can catch are cooked ones you buy at the take away shop!

My brother got his new G4 iPhone today... and it's hard to describe!

The graphics/screen and everything is pretty unreal compared to the older one.

Love the video, which is amazing as well, and with two camera's in it, you don't really need to carry another around!

Were you flying on a friday? Gliders are generally there every friday.

Been there quite a few weekends now, and I find it exactly as Ballpoint states.

Thanks guys

It would be a competition based thing, so whoever wins gets their pic in it. :big_grin:

David: Thanks for that, no I hadn't looked at RB, it seems interesting. Can you change the layout, formats, styles etc... on those though?

I find it a bit hard to see how it works first, without actually uploading and submitting photos. Also how does the costing thing work? How do they charge you for the production, and what are their prices? Doesn't seem to be any information I can find on it.

Like you said it's good to bring it local, but the ease, choices and cost are a pretty steering factor. Not sure if you've ever used the iPhoto keepsakes thing, but it's got hundreds of styles, shapes, sizes, colours, and what you can do, such as - mini photos in the date box... plus you can write in whatever you want there too - up coming events for the yr. ie. Natfly etc... Attached pic.

Gnome: Yes all the holidays and whatever, you can choose whatever country you want. I'll put a few screen shots up of what I'm talking about.

iPhoto print products May give you an idea on what I'm talking about. Mind you I'm open to other companies, just I've dealt with these guys, the quality and speed is next to none. So that's probably why I'm leaning that way. But it's up to you really.

This is the filling in the date thingo... random pictures, captions etc... (I've filled in the 10th - it's in red) The holidays and that are automatic.

Different countries

A lot of styles, personally I like the box to write things in.

Yes Cam, technically correct... but!

Had a bit of a refresher course/conversation with a forum member today, and it was nice to talk it through, simple as it may sound.

It dawned on me though, when you have thoughts of... "I wonder if that's how you are supposed to do it" Be honest with yourself! Have you ever done that?

You were taught it in your training, but it's been 12 months or more since, sure that's what BFR's are for... but what about in the in-between time?

So lets get the brain active again, and talk about it eh?

# How do you do a PFL?

# What is your procedure for a Prec Search and landing?

- The formula for working out the distance? Was shown a great one today, way easier than what I used to do - 1/2 IAS x Time(in seconds) = Length in meters. I was probably shown it originally, but the memory is a great thing...

# Short/soft field take off technique (s) ?

# Short field landing technique (s) ?

I know it's going to vary a bit in various techniques we all do/were taught, but I think it will be a great way to learn some new things.

Obviously the short field stuff is going to vary a lot due aircraft differences, but the other stuff should be pretty stock standard.

Instructors: now is your chance to have your say as well!