RE: Predator II ??

RE: Predator II ??
View related threads: (in this forum | in all forums)

Logged in as Guest

Users viewing this topic: none

Printable Version

All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Q-500 Racing >> RE: Predator II ??

Page: << < prev 1 2 3 [4] 5 6 7 next > >>

Login

Message

<< Older Topic Newer Topic >>

RE: Predator II ?? - 5/3/2006 3:46:46 AM

BUDMAN27

Posts: 1133
Joined: 3/28/2006
From: Galveston, TX, USA
Status: offline

That looks vary fer miler to me. I believe that is the way we built our sonics back in the day. I never had a sonic fire wall fall off to boot.

(in reply to Jim Wolfe)

Post #: 76

RE: Predator II ?? - 5/3/2006 3:09:26 PM

DMyer

Posts: 487
Joined: 10/16/2002
From: Potomac, MD, USA
Status: offline

That is the proper way to treat the front end... I also pin the firewall and add a 1/8" ply plate(not the lightweight) to the front end the exact size of the backplate mount Very little weight gain... but it is in the right place!

(in reply to Jim Wolfe)

Post #: 77

RE: Predator II ?? - 5/5/2006 12:15:31 AM

Airbike

Posts: 600
Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline

Well, my P-II's wing is almost 5 oz heavier than my Predator1 wing. Did anyone weigh their wing with servo & linkages?

The Predator1 wing w/Futaba full size servo is 14.9 oz
The P-II wing w/Hitec HS-225 is 19.6 oz

So maybe they are using a lot more resin to get a smooth finish?

My P-II RTF is 3 lb - 8.5oz, this is w/ GMS .25 & stock muffler, 3xHS-225 & 1-HS81 servo, 2.2 oz Nimh batt, Electron 6 Rx and stock everything else.

The used P1 I bought is 3 lb-3.4 oz, also GMS .25 & muff, 2xHS81MG, 1-HS81, 1 Fut sport digital on ailerons, Electron 6 Rx and 3 oz Nicad batt.

I don't suppose those with a TT .40 are coming in at 3 1/2 lbs, or is there just a big variation in planes?

Does anybody know how the weight affects speed? I mean is there a simple, rough estimate, that for the same plane, if it was heavier by X ounces, it would be Y mph or Z seconds slower?

Hey Reno, I can't make it to Whittier this Sat morning 5/6, but will be there in the afternoon with my Predators, my buddy should be there with his too. If you are there, we can do some informal laps for fun. I'll bring my Avionik D99 too.

Dan

_____________________________

The more you put into living, the more you get out of life.
Revver #150

(in reply to DMyer)

Post #: 78

RE: Predator II ?? - 5/5/2006 12:57:37 AM

HighPlains

Posts: 2670
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline

quote:

Does anybody know how the weight affects speed? I mean is there a simple, rough estimate, that for the same plane, if it was heavier by X ounces, it would be Y mph or Z seconds slower?

X,Y, Z??? What is this, a three diamentional problem? I thought you wanted to know time. Anyway, I use the one second rule. Always.

Oz. over weight, +1 sec/oz.
(oz. under weight) -1 sec/oz.

Alitude above sea level ~ 1 sec/1000 ft.
(Below sea level - Usually don't matter)

Humidity best when at 30%, +1 sec/+20%

_____________________________

In politics if you want anything said, ask a man. If you want anything done, ask a woman - Margaret Thatcher

(in reply to Airbike)

Post #: 79

RE: Predator II ?? - 5/5/2006 1:20:49 AM

BUDMAN27

Posts: 1133
Joined: 3/28/2006
From: Galveston, TX, USA
Status: offline

I believe that is why so many composite are delaminating in air, because the builder is so worried about weight that they don,t put enough material in the leading edge of the wing.

(in reply to HighPlains)

Post #: 80

RE: Predator II ?? - 5/5/2006 3:10:59 AM

daven

Posts: 6911
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline

So many composites delaminating in air??

What have you seen?

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to BUDMAN27)

Post #: 81

RE: Predator II ?? - 5/5/2006 3:15:18 AM

Airbike

Posts: 600
Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline

Thanks, highplains,

Wow, 1 sec per lap for each oz is a lot.

Temp, altitude, humidity, are same for all contestants at the race. I wasn't expecting such a big impact from the extra weight. So it would be worthwhile to try to hit the minimun allowable weight.

I'll take a closer look and see where some weight can come out.

_____________________________

The more you put into living, the more you get out of life.
Revver #150

(in reply to BUDMAN27)

Post #: 82

RE: Predator II ?? - 5/5/2006 3:38:33 AM

BUDMAN27

Posts: 1133
Joined: 3/28/2006
From: Galveston, TX, USA
Status: offline

Daven don,t get me wrong . I,m not a compsites hater. I,m just sating the facts. For the last two years at my club Texas city r/c club we have had the 428 boys here. One was almost killed when a compsite wing open up and darted down at the caller that was running to the pilot after releasing his airplane. the other was when the airplane was rounding pylon one. It makes the wierdest sound I have ever heard. Sort of a wooshing sound.

(in reply to Airbike)

Post #: 83

RE: Predator II ?? - 5/5/2006 4:27:01 AM

garys

Posts: 756
Joined: 1/31/2002
From: San Diego, CA, USA
Status: offline

I'd be curious to know which composite airplanes those were that blew up. I haven't seen an un-damaged one come apart in quite some time, and the ones I did see come apart were not from the known "lighter" builders.

Airbike, I believe HighPlains meant 1 second for the heat (10 laps), not 1 second per lap. In the real world, most people won't notice the difference between an airplane that's at 3.5lbs compared to one that's 3.75lbs.

GS

_____________________________

GS

(in reply to BUDMAN27)

Post #: 84

RE: Predator II ?? - 5/5/2006 4:48:19 AM

Airbike

Posts: 600
Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline

GS,

OK, 1 second for 10 laps is not that bad.

I'm sure the extra mileage I will be flying will be more detrimental to the final time than the weight.

_____________________________

The more you put into living, the more you get out of life.
Revver #150

(in reply to garys)

Post #: 85

RE: Predator II ?? - 5/5/2006 4:57:23 AM

MaxQ

Posts: 91
Joined: 2/10/2002
From: Santa Clara, CA, USA
Status: offline

Gary,

I've noticed my 3.75 lb Quickies kick up a little more dust on impact than my 3.5 lb'ers.

Tom Hegland
37c

(in reply to Airbike)

Post #: 86

RE: Predator II ?? - 5/5/2006 5:28:15 AM

HighPlains

Posts: 2670
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline

quote:

Airbike, I believe HighPlains meant 1 second for the heat (10 laps), not 1 second per lap.

Yes, about a second for the entire heat for an oz.

quote:

In the real world, most people won't notice the difference between an airplane that's at 3.5lbs compared to one that's 3.75lbs.

Yeah, but they are flying the 3 to 4 mile course.

_____________________________

In politics if you want anything said, ask a man. If you want anything done, ask a woman - Margaret Thatcher

(in reply to MaxQ)

Post #: 87

RE: Predator II ?? - 5/5/2006 7:42:29 AM

garys

Posts: 756
Joined: 1/31/2002
From: San Diego, CA, USA
Status: offline

I disagree Bob. Nobody flies a perfect enough course every flight to see a noticable difference from a couple ounces. I bet if anybody flew 10 flights with a 3.5lb airplane, and then added 2 ounces to that same airplane, they wouldn't see a noticable difference in their average times. There would be more difference in the times due to conditions changing than due to the weight of the airplane.
GS

_____________________________

GS

(in reply to HighPlains)

Post #: 88

RE: Predator II ?? - 5/5/2006 2:22:44 PM

HighPlains

Posts: 2670
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline

OK Gary, I'll make up a two oz. weight for you to carry in your plane for the rest of the season.

This will increase the total weight of a quickie by about 3.5%. While I would expect a minimum impact on top speed in unloaded flight, the 30% of the time you spend in high g flight would be impacted by the increased induced drag. Your airplane will slow more in the turns than the lighter one, and take longer to accelerate back to top speed.

_____________________________

In politics if you want anything said, ask a man. If you want anything done, ask a woman - Margaret Thatcher

(in reply to garys)

Post #: 89

RE: Predator II ?? - 5/5/2006 2:30:09 PM

daven

Posts: 6911
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline

I agree that lighter is better, but 1 second per ounce, per 10 laps seems higher than I would expect.

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to HighPlains)