diverdon

Tim,

14x8 is not going to give you much pitch speed, is it?

That's why I cut down the 16x10.

Don

camdyson

Did you guys ever reach a consensus regarding the distance from firewall to prop driver? I receall in some earlier posts there was debate as to whether 5" was a bit much, and 4 5/8" (from memory) was suggested.

I'm about to drill my engine mounts for the OS 70 Surpass', and if I grind off the noseleg holes from the mounts, can probably get the prop driver back to 4 3/4" or so. Also, seems these mounts allow some play side-to-side on the firewall, so with a bit of juggling should be able to get pretty well centred in the dummy engine whatever cowl angle is settled on.

Measure ten times, cut once, doh!.........

Cheers,

Cam

norm

"There ya go Cam there Ya go"

If you follow the pattern supplied in the Instruction book you should get that result.

Make sure you use the book and not a printed copy from a computer...they are not the same size.

Make a 100% photocopy from the book if you do not whant to cut the original book.

Normand

norm

Camdison,

Post 1065 reflected how i feelt, even if you erased it.

You Aussie guys ar not so bad after all.

If you intend to visit montreal next summer 21 & 22 of June, there will be a Warbird funFly at our club. I'm Hosting. I garantee that this event after my wedding 560 guests will be the 2nd most important event I'm presiding. (I'm only saying this because my wife is around!!!)

bookmark the site www.amidair.qc.ca and check next week for the online subscription.

timothy thompson

My Feedback: (1)

hi don,

i had 2 sets of 3 blades 16x10 and 14x8 to obtain ground clearance you must compress the oleos on the mains. i had to cut so much tip off that the end of the prop was square and very wide. I put it on and the hub is too thick for the tr tuurn system. i used a prop nut and got a wattage reading over 3000! and hot esc so i went to a 14x8 fits the tru turn system and watts are 1900 per side. 180 watts per pound can you say preformance. my 310 is 85 watts per pound and flys fine. too much pitch puts unnessesary load on the can, esc and batts. gas guys dont have these worries.

timothy thompson

My Feedback: (1)

here are the pics props all installed REMEBER IF YOU ARE E POWER AND USE THREADLOCK AS RECCOMENDED DO NOT TRY TO RUN THOSE MOTORS FOR 48 HRS. THE THREADLOCK WORKS IN AN ANAEROBIC (AIR FREE ENVIRONMENT) SO THE THREADS WILL NOT LOCK IF THEY ARE MOVED AT ALL. ANY RUNNING WILL MOVE THE TRU TURN ADAPTERS. THERE ARE TWO SETS. DO NOT GET THREADLOCK ON THE PROP IT WILL EAT THE PLASTIC MY DAUGHTER IS SO CUTE I COULDNT RESIST. THEGIRLISNT TOO BAD EITHER (lol)

diverdon

Tim,

I don't know whats up but I'm getting half the readings you are.

Both Motors:
7S4P 9200 A-123
88A
22.85V
1765W
6600 RPM

These are figures from both the Eagle Tree and BNB loggers. Both the same nimbers.


What kind of Amps are you pulling with those numbers?

Don

timothy thompson

My Feedback: (1)

DON IM ONLY RUNNING 4S CALL ME NOW 1700 1900 WATTS IS CLOSE IM WAITIGNFOR THE OTHER 2S PACKS SO ILL BE 6S 2P 10,000 MAH.. REMEMBER IM USING LIPO PACKS AND YOU ARE USING THE NEW CELLS 77 AMPS WITH THE CUT PROP I CANT RUN ANYTHING TILL THE THREADLOCK SETS IN THE 14x8 PROPS IVE POSTED PICS

timothy thompson

My Feedback: (1)

ok these tru turn hubs are hamilton standard scale and cost 60 a set they are hollow. Just to clarify what im using. they are not solid hubs. and they require anerobic thread lock here are weighs no outer wing panels and the 2s 5000mah packs missing that weigh 1/2 pound total






19lb 10.2 oz

wing panels with servos 1.1 lbs each
22 lbs goal weight


ill load up with lead up to 26 and see how she flys just to test it out

diverdon

Sorry Tim,
We had a power outage.
Guess the oxen got tired.

Don

timothy thompson

My Feedback: (1)

thats ok callwhenevernn19lb 10.2 0z that all except outer wing panels . thoise weigh 1.1 lbs a piece with the servos so thats 21lb .4 oz 2s 5000mah batts weigh 1/2 lb so less that 22 is a good number

Bill Giulian

My Feedback: (38)

Not to be a wise guy. But you two are using this site to talk to each other constantly. Why don't you just e-mail each other direct. I'm not sure how many of us are really interested in your conversations. Thanks. Bill.

diverdon

Last Post

Guess if we were talking about fuel it would be ok.

Thanks for all the help guys.

Don

Go Army

europatc74

My Feedback: (6)

Camdyson, Just finished mine. 5" is OK..

timothy thompson

My Feedback: (1)

thats what its for! read the red we are talking about the airplane, ya our mitchels can outfly glow live with it , The site up to this poin coexisted peacefully. are you not comfortable with new technology. buzz off . Hey don im glad i went 6s2p i couldnt resist and did a motor runup and found a cold solder joint on my left side. I cut the shrink tube and reheated now its fine. I did find out if you go parallel you can loose a entire side of batts and still have both motors turning. you would be able to recognise the loss in performance and land without a problem. The solder joint looked good though nice flow wonder if it could have been the deans? anyway i tested 10 times and was ok each time
sometimes the cables get twisted and a good shake up works. i know the parallel connections are fine( will save my but lots of times) and all rt side is fine. i am not using the rated 2s packs for these runs as they are not here yet so that could be a problem


army 1/509th geronimos ft polk La
OPFOR proud army dad and dad in law

timothy thompson

My Feedback: (1)

he had no right to say that, Norman is glow and we banter in a fun way we and myself will not allow our thread to be taken over or ruined

norm

Hello Thimoty,

What the H@#$ how much power do you have in this plane. In normal language if you are able to spit a 16x10, this is sick power! attach a tail bucket to this plane! Stop your worries about weight this plane can go easily 23 lbs. Can not wait to hear from your maiden.

Nice Job on this B-25 overall, you make shure you visit montreal June 21 & 22 at my Warbird funfly with this model.

Normand

timothy thompson

My Feedback: (1)

there was someone whe had a post erased due to me who said diver don and i monopolise the forum. its all taken care of. the 16x10 would not work. having to cut it down for ground clearance on compressed oleos bogged my motors. i have 14x8 masters and am pulling 156watts per pound. it will fly nice, i wired the packs in parallel so if i lose a side i keep both engines. Today i had a cold joint on a deans and fixed it. if that ever happened in the air i would still be 6s1p and have enough to make a normal pattern and land safley.
the snvyde comment about my plane flying faster than glow was meant for the person not you. i wonder who would be faster, you have as higher rpm and a lighter plane i have more raw steady power but heavy due to batts. i know it will go nice. those expensive tru turn hollow spinners are nice. take paint well and fit great.
have to order more stuff ftom flite metal and my additional 2s 5000mah packs. i tested it on 4s2p 5000 and have 28lbs but the voltage is low. With the other batts i will have more power

Bill Giulian

My Feedback: (38)

Tim. In reply to your previous postings about engines which might be used in the Top Flite B-25 I have decided to use the OS 81FS-a in my model. I thought of using the FS-70 Ultimate but was kind of swayed when you stated you were going to use the OS 81 FS in your new model. As a result I have ordered one OS 81FS to start the building process and will get another one as soon as I have a look at the fit of this engine in the model. Thanks for your help and will get back to you as things progress for any additional guidance which I am sure I will need. Really feel that these engines will make a more realistic sounding airplane. Bill.

timothy thompson

My Feedback: (1)

go with a pressure pump with short stack and you will have scale sound! norman did this i believe that big muffler sticking out can be cut

norm

Yeah, no muffler at all with a pump. I would stick to the 70ultimate since the power produced by that little engine is almost as powerful as the new 81's. they show 1.2 hp vs 1.3 for the 81's and the weight and size is less on the 70 ultimate. Also you can conceal them in the cowl for a better look. Those cowls are not so big. The Ultimate also has a built in pump. The muffler does not belong on this nice aircraft in my opinion.

you should have plenty of power with the 70ultimate and the 81. They should make the 81 with a pump, in fact all manufacturers should make engines with a pump like some models from OS.

Normand

camdyson

thanks Euro' - time to drill some holes then.

Glad to hear there was a post pulled - thought Tim had been sniffing fumes there for a minute...

BTW, I wanna be there when you blow an ESC on one engine whilst ballasted to 26lb Tim - THAT will test the ol' rudder skills[8D]

Cheers,

Cam

hippo-1216

You guys have really helped me decide on which power to put in mine but i have a quick question When mounting the robart gear which addendum do you go with The topflite web site tells you to center on the railes the one that comes in kit tells you to position all way back which one is right hope some one hase answer Good luck with all with B-25s happy flying

norm

Re Gear.
The good answer is all the way back on the railes

timothy thompson

My Feedback: (1)

the 25 lb test will be a one time only test. im running 22.2v 10,000mah parallel. jeti 77 optos can handle lots of power. its like dead sticking a warbird, put the nose down and land no big deal. ive done it on purpose on the tf 310 i cut the motors at 500 ft and glide her in at 22.6.
the key is knowing how to fly a pattern . Being a full scale pilot helps. you fly the plane and dont let her get ahead of you.

that will be a one time only ballast test she will come out at 20-21. I could loose a whole side of batts and due to the parallel connection have both mills turning for a landing E calc says 28 min at 75% power if all is well. If a go to 1p ill have 3.5 min to get her down. enough for 3 tries

remeber i have a private field at my home and have noone else to worry about a 500X100 asphalt strip. My wife id disabled and this was the only solution. i can fly and if she needs me we have a light hooked up that comes on. she broke her back and had major surgury. the pain is so bad she lives with a morphine pump permantly implanted.