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Offline davegenet  
#166 Posted : Monday, December 11, 2017 2:01:49 AM(UTC)
davegenet

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Hi Suds,

I have done a lot of thinking on this as well and I agree you should be good to go with the 12S8000 with even a thought to throttle management. I will be in the same boat next year. I believe you are flying the new Extreme Flight 91" Laser which should be pretty light all up weight and that will help also.

I think you're flying Jeti. Are you going with redundant receiver batteries?

Dave
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Suds on 1/18/2018(UTC)
Offline Suds  
#167 Posted : Thursday, January 18, 2018 4:57:44 PM(UTC)
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Originally Posted by: davegenet Go to Quoted Post
Hi Suds,

I have done a lot of thinking on this as well and I agree you should be good to go with the 12S8000 with even a thought to throttle management. I will be in the same boat next year. I believe you are flying the new Extreme Flight 91" Laser which should be pretty light all up weight and that will help also.

I think you're flying Jeti. Are you going with redundant receiver batteries?

Dave


Dave, thanks for the response. The Laser came out at 19.9# with 12s-6000 packs and should be around 21.5# with the 8000 packs.
I've just switched from Hitec to Spektrum radios. Currently on a DX8 G2 and pondering a ix12. While I love what Jeti brings to the table, the form factor and feel of the tx is just not for me.
I'm running a Hercules BEC with a Ultraguard for backup redundancy. Capture.JPG (129kb) downloaded 0 time(s).
Offline Suds  
#168 Posted : Thursday, January 18, 2018 5:07:21 PM(UTC)
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Originally Posted by: rclad Go to Quoted Post
Welcome to IMAC!

There are many variables that come into play here. What is your all-up weight? The Nano-Tech 8000 as a 12s pack is about 1.5 lbs heavier than my Glacier 6000 pack. I estimated the wing area and AUW of the 91" Laser to come up with the values below with a 24x10 electric prop (from Aeroplayin's PAR calculator). You should get at least 8 minutes of flying time if you manage the throttle well. The 2018 Sportsman sequence takes only 5-6 minutes to complete two times. You will be very competitive with your set up!

EF Laser 91 PAR 8000mAh.pdf (43kb) downloaded 15 time(s).

Thanks for your feedback Greg!
Looking forward to my first try at IMAC. Hoping to make the North Central Judging school at Muncie in April.
Plane should weight in around ~21.5# with the 8000mah packs - exactly the same as my 91" Extra does with 6000mah packs. Wing area is 1650. I managed to maiden the plane on one of the only decent temperature days this Dec-Jan time. I only flew with the 6000mah packs at 20# and at that weight, the plane was very floaty and can easily handle the extra 1.5# battery weight. I've used Aeros (Jim's) PAR calculator many times. Cube loading at 9 with the heavy packs so all good there.

A stranger happened upon the field during the maiden date so I tried to stay low while he graciously took some video with my phone.

Offline rclad  
#169 Posted : Thursday, January 18, 2018 5:36:00 PM(UTC)
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Congratulations on the maiden! Flight #3 looked great. You have more guts doing that with a new plane than I ever had. I plan on going to the judging school in Muncie, so I'll see you there.
Greg Hladky
Flying on a wing and a purpose...
and physics, power, practice, preparation, plans...
and pioneers who pushed the envelope!
Offline djmoose  
#170 Posted : Thursday, January 18, 2018 7:17:14 PM(UTC)
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Awesome choice with that new 91 Laser!

I won't be at the Muncie school, but I'm sure I'll see you around at some contests!
Offline Suds  
#171 Posted : Thursday, January 18, 2018 7:53:03 PM(UTC)
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Thanks all, looking forward to trying my thumbs at IMAC to focus on some precision. Been flying 4 years and like both the challenge of pattern and 3D flying. Questions and/or advice requested: 1) jump into Sportsman or start out in Basic? 2) Where is a good resource for setting up a plane for IMAC - I'm used to huge 3d throws.
Thanks all!
Offline rclad  
#172 Posted : Thursday, January 18, 2018 8:42:30 PM(UTC)
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If you can fly 3D, you have a whole lot more skill than I have. Precision flying, however, is a different animal. I would suggest starting in Basic, so you can get comfortable with the rules and flight line procedures. If you find the sequence is too easy, you can always move up. Once you start in an upper class, you can't move down. I was getting bored with the Basic sequence by the end of the year, but it was nice to enjoy a few wins along the way to boost confidence.

There is plenty of help here in the forums for set up, etc. Just search for the info you need. Flying Giants also has some helpful threads for IMAC pilots of all levels. You can see the thread I started last year for my plane here in Shop Talk (Tuning New Plane in Two Weeks?) to get throws recommended by the more experienced pilots.
Greg Hladky
Flying on a wing and a purpose...
and physics, power, practice, preparation, plans...
and pioneers who pushed the envelope!
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Matt Komar on 1/19/2018(UTC), Suds on 1/19/2018(UTC)
Offline Matt Komar  
#173 Posted : Friday, January 19, 2018 8:40:03 AM(UTC)
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Greg has got the right idea. Use your first contest to get acquainted with the rules and pacing of the event. For some, it can be a new challenge getting comfortable flying in front of other people, with other planes in the air all while being judged. Limit your workload, and if at the end of the contest you feel comfortable moving up, you can.

Looking forward to having having you join us this year!

Matt
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Suds on 1/19/2018(UTC)
Offline Joe Layne  
#174 Posted : Friday, January 19, 2018 9:06:13 AM(UTC)
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Suds welcome to IMAC. If you make the judging school bring your plane. If the weather is good we fly on Friday and Sunday. You can fly for all the judges on Sunday and get an ideal of how you will fill in your first contest.

Joe Layne
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Suds on 1/20/2018(UTC)
Offline Suds  
#175 Posted : Friday, January 19, 2018 9:35:41 AM(UTC)
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Originally Posted by: Joe Layne Go to Quoted Post
Suds welcome to IMAC. If you make the judging school bring your plane. If the weather is good we fly on Friday and Sunday. You can fly for all the judges on Sunday and get an ideal of how you will fit in your first contest.
Joe Layne

Thank Joe,
I will certainly bring my plane(s). I currently don't have that Friday off but may put in a vacation request for that day.
Any idea how long the classroom portion goes on Saturday and if there is some time for a few impromptu flights afterwards?
Thanks, Rob
Offline Joe Layne  
#176 Posted : Friday, January 19, 2018 10:38:54 AM(UTC)
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If I remember correctly its about eight hours Sat. Sunday is practice judging on the flight line. Friday is just for fun and meeting new and old friends. Last year it was very cold and windy with some rain but we got in some flying and had a great time. If you have a camper it will save you some money. Many of us bring campers to all the contest, as getting together on Friday and sat night for fun, GOOD food, and drinks makes it a complete weekend.

Edited by user Friday, January 19, 2018 10:59:06 AM(UTC)  | Reason: Not specified

Offline Suds  
#177 Posted : Friday, January 19, 2018 8:20:33 PM(UTC)
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Originally Posted by: Joe Layne Go to Quoted Post
If I remember correctly its about eight hours Sat. Sunday is practice judging on the flight line. Friday is just for fun and meeting new and old friends. Last year it was very cold and windy with some rain but we got in some flying and had a great time. If you have a camper it will save you some money. Many of us bring campers to all the contest, as getting together on Friday and sat night for fun, GOOD food, and drinks makes it a complete weekend.


No camper and not in the cards. The better half supportive enough up to and including an Aero Express trailer but a camper out of the question due to car towing limits, budget and HOA covenants. Do have a tent setup that I could put to use at an event or two if needed but fortunately for this one, I'm only a 70 minute drive to the AMA.
-Rob
Offline rclad  
#178 Posted : Tuesday, February 13, 2018 12:23:56 PM(UTC)
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How do you guys decide on the best prop for IMAC? How much thrust to weight is enough vs. flight time? I would think maximizing flight time while providing just enough thrust for good vertical performance is more important than top speed or maximum thrust. Is that the right approach?

The numbers below, from Aeroplayin's PAR calculator, are for the new 3DHS 95" Extra 330SC-E with 12s 8000 mAh batteries and a 24x10 carbon fiber electric prop. Percent throttle usage is estimated at 35%, but that may be a bit low, so flight time I'm sure will be less than the estimated 9.66 minutes.

Looking forward to flying this new plane and hoping I can be competitive with it in Sportsman.

3DHS 95 Extra 330SC-E 8Ah 24x10CFE.pdf (34kb) downloaded 7 time(s).
Greg Hladky
Flying on a wing and a purpose...
and physics, power, practice, preparation, plans...
and pioneers who pushed the envelope!
Offline Dangerous Dan  
#179 Posted : Tuesday, February 13, 2018 1:04:15 PM(UTC)
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Originally Posted by: rclad Go to Quoted Post
How do you guys decide on the best prop for IMAC? How much thrust to weight is enough vs. flight time? I would think maximizing flight time while providing just enough thrust for good vertical performance is more important than top speed or maximum thrust. Is that the right approach?

The numbers below, from Aeroplayin's PAR calculator, are for the new 3DHS 95" Extra 330SC-E with 12s 8000 mAh batteries and a 24x10 carbon fiber electric prop. Percent throttle usage is estimated at 35%, but that may be a bit low, so flight time I'm sure will be less than the estimated 9.66 minutes.

Looking forward to flying this new plane and hoping I can be competitive with it in Sportsman.

3DHS 95 Extra 330SC-E 8Ah 24x10CFE.pdf (34kb) downloaded 7 time(s).



For gas planes my personal preference is a lower diameter and higher pitch that puts me in the correct wot rom range. This makes it quieter by reducing tip speed at a given rpm and gives better downline breaking due to increased pitch. It would appear that icreased pitch would increase downline speed but I see the opposite the plane is moving faster than the prop wants to pull it so the prop acts like a brake. In the case of electric you will with most props have plenty of speed and thrust and lower sound so go with the more efficient prop.
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Offline Suds  
#180 Posted : Thursday, February 15, 2018 9:11:43 AM(UTC)
Suds

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Originally Posted by: rclad Go to Quoted Post
The numbers below, from Aeroplayin's PAR calculator, are for the new 3DHS 95" Extra 330SC-E with 12s 8000 mAh batteries and a 24x10 carbon fiber electric prop. Percent throttle usage is estimated at 35%, but that may be a bit low, so flight time I'm sure will be less than the estimated 9.66 minutes.

Looking forward to flying this new plane and hoping I can be competitive with it in Sportsman.


Greg,
Presuming you are going with the XPWR 60cc as well. If that is the case, that motor is very happy with the Xoar 24x12 PJN wood prop. I'm not sure which carbon prop you were considering but the Falcon carbon-E props pull about 20% less power and give 20% less thrust than the PJNs. 3D Guys that were running Falcon Carbon-E props are running the motor on the 24x13. For IMAC purposes, I'd imagine the Falcon Carbon-E 24x12 would be good or perhaps the Mejzlik 24x10 as that has thrust more in line with the PJN series of props.

Here is my 91" EF Extra on 6000mah packs (should be about the same weight as the new 95 E-only Extra with 8000mah packs. This is with the XPWR 60cc and the Xoar PJN 24x12 (great combination), granted this is 3D flying but this system has plenty of thrust, speed, and a quick spool up.

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