Gryphon

Strker_Viking,

You cannot make that general comment" Medusa handles more Amps" because there are other factors involved.


Gryphon

Flightops_69

The USS Nimitz was in port today, here's a vid of me flying nearby it, and some pics of the carrier.

<disregard this post, cannot upload *.avi>

smoothound

Too many decisions

I'm reading your PM and last post and digesting now...

Thanks for your time and effort Gryphon

chippedprop

Well I'm back
I had to go and take care of some emergency property issues at my family home
I didn't get a chance to post a notice and mom does have a computer- I 'm sorry to all if I was missing in action
Will PM and post if that comes up again
CP

LoudEye

Hello,

I have been away from the park flyers (airplane section) of this forum for a little over a year but finally am getting my old park fliers out of the closet and hope to get a little help.

Can someone help me understand how to calculate the old F-27B stock motor and prop power measurements. I specifically am trying to figure out if a brushed 20 Amp ESC and 7.4v 1300mah 18c lipo battery would power the old brushed stock motor/prop. The lipo battery can supply up to 23.4 amps but I am not sure if the motor/prop would even draw up to that amount.

Thank you for any help.

Gryphon

LoudEye,

The stock motor and prop combination will come nowhere near the limits of your 2 new parts (ESC, Battery).

The stock receiver/esc unit was tested by King_Paul and I at 17A or so running a larger brushed motor.

I have been able to successfully smoke several stock motors with a APC E 6X5.5 and the stock receiver/ESC was fine.

With 3S, do not go above APC E 6X4 with a 2.3mm prop adapter on the stock motor. Even then expect shorter flight duration but the extra fun is well worth the shorter life span of an $11 motor...you make your own decision.

Sooner or later you might end up with brushless.

A decent BRUSHED motor is sold by Hobby-lobby it is the Graupner 6304L.
Make sure to get the one that ends with "L".
"L" means left hand, which means reverse rotation, which is the correct direction for a motor in rear. This way you can run regular props. (Numbers on props should face forward). Motor mount needs to be modified for this fat motor.

________________

Anyway since the stock setup is far below 17A, your 20+A setup will be doing great.


Gryphon

thetrums

My Feedback: (22)

Gryphon, here is my new stryker. what prop is best for my stryker with TP 2200 14.8v mega 16/15/4 and phoenix 35 ese? I used a 5x5 and it ran great but choppedprop recommended the 5.5 x4.5 to try, any sugestions?

Gryphon

the trums,

Chippedprop is 100% right, that 5.5X4.5 prop will be a superior prop, and you will see most of the benefit in better acceleration and much better climbing capability…a 2 MPH speed gain too????
Not much of a top speed difference.

You could also try 6X4 if you are willing to give up some top speed for additional climbing fun...Flight duration at full throttle LEVEL flight will also go up....remember you'll fly a little slower...should be under 5 MPH slower than your 5X5 prop, but at monstrous gains in climbing.
Realistically with so much more climbing power…no way that you are going to stay level……LOL…so flight duration may be a little less.

Over all 5.5X4.5 should be a winner......I would try them both, because it comes down to personal taste.

APC makes both props besides other manufacturers.

Warm motor is O.k. Sizzling is not, it will not get that hot. And you can always add a $4 heat sink to it….Don’t even worry.

Edit: You should see an easier launch due to better acceleration.

Let us know what you find or how you feel with each prop.


Gryphon

thetrums

My Feedback: (22)

Thanks for all the help! There is a Stryker on RC Universe for sale that he says radared at 130mph with a 3 cell 2200Mah battery, is that possible?

LoudEye

Thanks for the response Gryphon. I definitely want to upgrade the stryker to a brushless motor/esc. I just haven't decided what to get yet. I was thinking about the F-27C version of the brushless motor/esc but there is probably a cheaper and better solution. I just need some time to read through this forum and catch up on a year of posts!!

Anyhow, ever since my flying buddy moved - I haven't found any willing dog fighting stryker flyers...I dug out a stryker with a mig 23 paint schema on it the other day and decided it needed to see some flight time. Thanks again.



nice looking bird there trums!

thetrums

My Feedback: (22)

Thanks Loudeye! Gryphon and these guys forgot more than I will ever know about Strykers. But I think for the money my set up is fairly good and inexpensive compared to the monsters the other guys build. I have a mega 16/15/4 using TP 2200Mah 14.8 v 4c batteries and a phoenix 35 ese. It hauls butt compared to the C. I started with the B replacement airframe for $59 and ordered the C motor mount. We will see what the experts think.

Gryphon

the trums,

2 of those battery packs in series as 6S will have a little bit of a hard time, if not a hard time at 130 MPH on a full profile Stryker.

I suppose if he had thinned out the wing an extreme amount and if he did the radar run at the end of a vertical dive...it may be possible...I say not.

*** To give him the benefit of doubt, he could be referring to prop pitch speed which in no way has anything to do with flight speed, well I should say not very indicative.
If 5.5" diameter prop then we are talking about 100 MPH flight speed. The smaller the diameter the lower the flight speed (given a fixed pitch speed).

Prop pitch speed in MPH = RPM X Pitch / 1056 (pitch in inches)

__________________________________________________ _________

Your combination is good and solid 90 to 90+MPH setup. I love MEGA motors but for future builds, I see better performance with Medusa 480 size compared to your MEGA 400 size at same $80 price.

If you ever want a better MEGA then look at the 16/25/X series, most probably the 3 turn 1700KV swinging a large prop. It’ll let you make 3 times the power with higher voltage and amps. Well worth the extra $15. Be prepared for bigger ESC, and more battery weight if you decide to increase the power a lot.

I do like your combination. It is sweet.

__________________________________________________ _________

LoudEye,

I’m working with chippedprop to make a list of recommended motors. Hang in there till he places that post.
He is more moderate than me. Mean while figure out the fastest speed that you will ever want to attain in a Stryker so you can buy the right parts when it comes time to discuss parts.
Figure out budget and top speed desired, make comments on acceleration and weight. Remember an Ultra fast Stryker is not great for dog fighting…but then again, you don’t have a buddy to dog fight with, so maybe you want to fly fast or climb like a rocket.
Hold off on your post till the list comes out…unless you are buying parts this week.
The list is almost ready.


Gryphon

Flightops_69

Ok, Here's a link to my new video. The Nimitz is right above the Arizona at :31 seconds into the video, then I have the Missouri framed between the vertical stabilizers.

http://youtube.com/watch?v=IPc8MVBoV-0

MRI

No further comment!

speedfreek

My Feedback: (2)

Hi everyone, my LHS sold me a 6 series 2700kv, CC 54 amp ESC, to run with a 11.1 2100 batt to give me more speed. After installation I do not see much improvement. Any suggestions?

thanks for listening

MRI

No further comment!

Flightops_69

Looks like someone brought in the big guns, with MRI's post.

Flightops_69

How does Don's 2700kv motor: http://donsrc.com/cart/index.php?act...d&productId=12
compare to a MR 28-040-2500? I dont have much data on dons', other then what is posted, and I have no testing equipement other then a timer and my hand to see how hot thing get.

speedfreek

My Feedback: (2)

thanks Flightops, for the info on Don's site. It looks like I need a 4s batt and 4-4 prop. I am not sure how the motors compare, how do I check?

Brazman

what prop are you running speedfreek? And what C rating is your battery?

Flightops_69

Myself, I run a 2200 20C 11.1v with a 5.5*4.5 or a 4*4.5, and if I really want to climb, I use a 6*4, but not WOT the whole time. I dont have any testing equipment, but when I run the 6*4, the motor gets rather warm in the 115 - 120 degree range, but it climbs like a demon. The 4*4.5 gives me some speed, and the battery lasts the longest, with the motor running the coolest, the 5.5*4.5 is the best compromise between them. Again, I dont have Gryph's or SV's experience or equipment, just what I've observed on my plane.

Flightops_69

I have 3 2200 lipos, they are 12C, 15C and 20C. Can I link 2 of them in series? I'm guessing, if so, it would be the 12 and 15C respectivly. What are the benefits of doing this, if possible? I'm getting used the speed of my bird, and would like to go faster.

speedfreek

My Feedback: (2)

Hi Brazman, I have a 6-4 prop and 20c batt

Brazman

Speedfreek,

When you say you didn't notice an improvement do you mean over a stock setup? Sorry if you just posted this but I don't get time to read the whole thread. Is it the stock prop? If so get an APC and make sure your prop isn't on backward.

Flightops,

Personally I wouldn't mix different capacities or C ratings in a series setup as it will lead to balance issues and possibly over discharge and subsequent damage. In fact I personally don't even mix packs with a different number of cycles. I pair up my packs and thats how they stay.

speedfreek

My Feedback: (2)

yeah Braz, I was comparing to the stock setup with the 1800kv motor. I left the stock 6-4 prop on also. Will try an apc also.