Тёмный

Incredible ultralight short field takeoff! 

Jim Pfarr
Подписаться 934
Просмотров 11 тыс.
50% 1

I learned a great technique for improving my short field takeoffs when flying behind a 1/2 VW engine. These engines have a lot of torque but not a lot of thrust which can mean anemic takeoff performance. This method, adopted from the STOL pilots, works great to get an ultralight equipped with flaps off the ground more quickly, and up to a safe altitude more quickly.

Авто/Мото

Опубликовано:

 

17 авг 2021

Поделиться:

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист
Посмотреть позже
Комментарии : 51   
@flyingkub
@flyingkub 2 года назад
I have used the "flap bump" as we call it here, when I am taking off with a lot of ground drag (long grass fields). I get the tail up just before normal takeoff speed bump in the flaps and that lifts me off the ground, then fly in ground effect before transit into a normal climb out. I don't use full flap but half on my aircraft as I don't gain much more lift between half and full but I do gain a lot of drag.
@treylem3
@treylem3 Год назад
Great vid and info, thanks 👍
@aerialimagesbydoug5733
@aerialimagesbydoug5733 2 года назад
Good information! Thanks!
@commentatron
@commentatron 2 года назад
Good info and great looking production! Also, it took me about four minutes-in to realize I was looking at a still frame; thought you were just really focused. :D
@JimPfarr
@JimPfarr 2 года назад
Thanks! Always trying to find new ways to make the video interesting
@creativelife4453
@creativelife4453 2 года назад
awesome , i like this plane
@marcwisdorf4092
@marcwisdorf4092 2 года назад
floatplane technique for last 60yrs.. I use itt on a Beaver too, but leave handle up and give it one stroke down
@montanasoftware5954
@montanasoftware5954 Год назад
Jim: If you don't mind my asking ... what was your weight when you filmed this? How much did the plane weigh? Or if you prefer, what was the combined weight getting off the ground? The weight makes a huge difference for takeoff.
@JimPfarr
@JimPfarr Год назад
Total gross was close to 550 pounds. The Ultracub with the 1/2 VW is known as a poor performer, partially due to wing loading, partially due to design, and partially due to the inherent performance limitations of the engine.
@arthurthompson5647
@arthurthompson5647 2 года назад
I would add a caution on stick forward. My Belite, Thor 250 DS, 59" 2 blade Eprop can whack the ground pretty easily. I would also add that your technique is in the POH on my Tri-Pacer and works extremely well on both my aircraft.
@JimPfarr
@JimPfarr 2 года назад
Thank you - great tip! Not all engine/prop combinations give the same ground clearance.
@arthurthompson5647
@arthurthompson5647 2 года назад
@@JimPfarr As you say, not enough ground clearance: I probably should have gotten the 3 blade 55" prop but the weight and thrust were so so much better with the 2 blade than anything I have ever used I just couldn't resist. Wheel landings require care when I shove the stick forward but a little muscle memory comes with practice and I've only dinged one blade if my luck holds:-)
@buckmurdock2500
@buckmurdock2500 2 года назад
What are the measured distances for this technique? Both ground run and total distance over obstacle?
@JimPfarr
@JimPfarr 2 года назад
Sorry, I don't have that data. Sadly I don't have a team of engineers on hand, and aside from that nobody typically provides this kind of hard information for ultralights.
@ryoungatlmidotnet
@ryoungatlmidotnet 2 года назад
Did I miss it, or what was your takeoff roll with this technique?
@JimPfarr
@JimPfarr 2 года назад
I'm not sure since I didn't have someone there to help me measure, but I'm going to say it was around 700 ft. I'll have to put out markers for myself to find out
@johnlucas2037
@johnlucas2037 2 года назад
My quicksilver XL would easily get off the ground in about 100 feet. And Would land really short thanks to the spoilers or spoilerons but they could be deployed at the same time which was great for getting you on the ground. I often wonder why more of the STOL pilots are not using spoilers?
@sammarmon3965
@sammarmon3965 Год назад
It’s hard to think of this as a short field capable ultralight when the quicksilver is about a 3 Mississippi from stationary to airborne.
@johanhelberglongbowsknifes1185
@johanhelberglongbowsknifes1185 11 месяцев назад
JIM DO THIS PLANE COMES WITH FLAPS? WHAT AIRCRAFT IS THIS AND WHAT TYPE OF FLAPS IS IN AIRCRAFT IF THERE IS FLAPS ON? I AM ON LEARNING STAGE SIR.
@JimPfarr
@JimPfarr 11 месяцев назад
This is a Belite Ultracub, it is no longer being made. It has flaperons, combined flaps and ailerons. You asked me this before on another video, why are you asking me again?
@tomcoryell
@tomcoryell 2 года назад
Hi Jim, does your Ultracub come in below 254lbs with the 1/2 VW?
@JimPfarr
@JimPfarr 2 года назад
With an emergency parachute and careful weight management you can build an UC to stay below 278 pounds (Part 103 compliant). The 1/2 VW is on the heavy side but that's the price we pay for having a 4 stroke engine.
@carlishardy8657
@carlishardy8657 Год назад
I’ve got a 45 horse half VW twin Mikuni 28MM haven’t been able to get it to idle and run up right with these carbs can’t somebody help me
@JimPfarr
@JimPfarr Год назад
There's a half VW forum on Facebook, lots of helpful folks there who can help you.
@keithschneider6348
@keithschneider6348 Год назад
Makuni carbs are simple and easy to adjust. Hard to sink because there spread out. Check valve lash, timing, advance mec. Idle air screw. To big of prop. 4 strokes like it lean. I'll be there because I have a 45hp to mount an run. Wondered the same.
@Frank-uj5cr
@Frank-uj5cr 2 года назад
What kind of prop you have i have a n3 pup with a 54x22 and its just making too much rpm and not enough speed, 33-3500 in cruise and only 45-50 mph
@JimPfarr
@JimPfarr 2 года назад
I have a 54 x 24 with a slight modification to narrow the tip by 1/4 inch or so. My engine is a 86 x 94 (bored and stroked) so I'm getting around 42 hp.
@Frank-uj5cr
@Frank-uj5cr 2 года назад
@@JimPfarr what rpm is ur cruise and what speed are you getting?
@JimPfarr
@JimPfarr 2 года назад
@@Frank-uj5cr @3500 rpm I'm seeing 65 mph or a little more. I cruise at 3300 (I'm high on the gross weight) and get 60 mph or so
@Frank-uj5cr
@Frank-uj5cr 2 года назад
@@JimPfarr appreciate it, is your prop a culver? I have a old woods and was told the pitch from some of the older manufacturers was not as precise as those like prince or culver.
@JimPfarr
@JimPfarr 2 года назад
@@Frank-uj5cr Yes a Culver prop. I've spoken to Alaina Lewis there on several occasions, she'll customize a prop for you to meet your unique performance requirements.
@timrupp4219
@timrupp4219 7 месяцев назад
Gotcha... Soon we may be watching crash videos after aircraft stalls
@JimPfarr
@JimPfarr 7 месяцев назад
How many hours of ultralight time do you have? Always looking for more enthusiasts, and we are in dire need of instructors.
@monostripeexplosiveexplora2374
@monostripeexplosiveexplora2374 Месяц назад
that seems a bit dangerous, depending on the angle of flaps and associated loss of speed.
@JimPfarr
@JimPfarr Месяц назад
Not at all. You have to pay attention to your airspeed in the climb. You're not going to get very high, but it will work nicely for 50 ft obstacle avoidance
@altonkenne579
@altonkenne579 11 месяцев назад
You bought a belite ultracub hmm hope you had good luck I bought a yellow ultracub ,in 2012 it was the right color it's a junky lemon from day one biggest financial mistake I ever made dangerously built aircraft
@JimPfarr
@JimPfarr 11 месяцев назад
Oh yah, built it from scratch. Ok design, but the company (and the owner) was as sketchy as the day is long. Flew good when the engine was in proper tune, but I had to fly at max gross wt. Crashed last August with an engine problem and sold the whole thing for peanuts.
@altonkenne579
@altonkenne579 11 месяцев назад
@@JimPfarr yea it's an awesome look but the way the fuselage attached to to cab area is sketchy James put a used prop on it and it was way out of balance you could see an imprint from a different hub on it the fuselage was twisted the left wing root had 3/8 inch slack up and down on takeoff you would hear a clunk when the air lifted the wing all the wiring had loose connections and it caught fire 4 times underdash before I found the problem needless to say just the Texas heat destroyed the sailcloth and even melted the cheap glue the wings were put together with I only had 2 wright brothers flights and 1 2 mile round thru the pattern at 250 ft before I had to pretty much give up and park the junker sad I really like James and Cathy but they saw a sucker and capitolized
@JimPfarr
@JimPfarr 11 месяцев назад
Sorry to hear that you got sucked into the Weibe charade. Come join my Badland/Ultracub page on Facebook, the Badland planes are a cousin to the UC and a huge improvement (owned by Chris Deuel - an outstanding indivdual)
@altonkenne579
@altonkenne579 11 месяцев назад
@@JimPfarr yea iv seen the planes on RU-vid after I got weibed lol new word for screwed
@vg23air
@vg23air 6 месяцев назад
nice video, however, i do have to say, this plane is severely under-powered. Any overpowered overweight ultralight (rotax 503) gets off the ground in 6 seconds, trust me, this is my bible on assessing performance. The maximum time is 12 seconds and that is always a smaller 2 stroke OR any of the 4 stroke lawnmower mods like the briggs vangard 23 hp. The thumpair 4 stroke single is close to 6 seconds, which I was surpised at, your STOL performance is a staggering 20 seconds, I am hard pressed to even find another ultralight that has that performance or requires that much runway. Les Holman at 275 pounds still gets his legal eagle up in 13 seconds with the briggs and stratton. I think you need to consider the above as you continue with that vw powerplant.
@vg23air
@vg23air 6 месяцев назад
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FImGxphcRkU.htmlsi=wxM8L01hNv8jtE8X
@vg23air
@vg23air 6 месяцев назад
my plane flown by others, with either a kawaski 400 or rotax 503, i dont know, 9 seconds. 2 stroke 4 stroke doesnt matter. thats proven by the thumpair and briggs (top rpm 4400 with 1.8 to 1 redrive). ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fn2hEtDPB8k.htmlsi=TYpCyTWmYApzs-Kd
@vg23air
@vg23air 6 месяцев назад
same legal eagle briggs 23 much lighter pilot 11 seconds ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-S20GaT-fRuk.htmlsi=-AlRXuwQNqlv15HF
@JimPfarr
@JimPfarr 6 месяцев назад
What you see is typical for the 1/2 VW engine which is known to have an anemic climb rate of about 400 ft per minute, and I will grant you this configuration with me at the seat is hitting max gross weight. All that said, I have been making best use of the kit I bought knowing full well the limitations of the VW engine. This kit turned out to be a near total pig, once I got it flying I was pretty unhappy with it and made a big boy decision to make the best of what I had. I know full well the capabilities of 2 stroke engines and went for the vintage sound of the 1/2 VW. Building and flying planes is all about tradeoffs, and I as a fully informed builder made the decision I was happiest with. Consider me fully considered, and thanks for the comment.
@vg23air
@vg23air 6 месяцев назад
@@JimPfarr thanks
Далее
Engine power loss at 150 feet
7:34
Просмотров 51 тыс.
Oct 1 2020 update - rebuilding my 1/2 VW engine
7:22
Просмотров 4,6 тыс.
Какую одежду я не ношу? 😱
00:13
Просмотров 402 тыс.
FARUX RAIMOV AVJIGA CHIQDI - JAVOHIR🔥
01:01
Просмотров 1,2 млн
Affordaplane TA1 Has an Engine Out at 1500'
4:31
Просмотров 34 тыс.
Challenger ll is it For Heavy People? Tour New Home!
21:33
Bushplane Badlands Traveler Walkaround
16:42
Просмотров 14 тыс.
RagWing Low Aspect Ratio Experiment-Lazy Bee replica
8:52
Covering Control Surfaces With Oratex
21:36
Просмотров 41 тыс.
Legal Eagle Walk Around
8:32
Просмотров 50 тыс.